v1.2.9: mermaid diagrams, math editor, external viewer, manual notebook sort, heading hotkeys

package.json

@@ -2,7 +2,7 @@
   "name": "helixnotes",
   "private": true,
   "license": "AGPL-3.0-or-later",
-  "version": "1.2.8",
+  "version": "1.2.9",
   "type": "module",
   "scripts": {
     "dev": "vite dev",
@@ -65,6 +65,7 @@
     "markdown-it-mark": "^4.0.0",
     "markdown-it-sub": "^2.0.0",
     "markdown-it-sup": "^2.0.0",
-    "markdown-it-task-lists": "^2.1.1"
+    "markdown-it-task-lists": "^2.1.1",
+    "mermaid": "^11.14.0"
   }
 }

src-tauri/Cargo.lock

@@ -1850,7 +1850,7 @@ checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
 [[package]]
 name = "helixnotes"
-version = "1.2.8"
+version = "1.2.9"
 dependencies = [
  "arboard",
  "chrono",

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "helixnotes"
-version = "1.2.8"
+version = "1.2.9"
 description = "Local markdown note-taking app"
 authors = ["HelixNotes"]
 license = "AGPL-3.0-or-later"

src-tauri/src/ai.rs

@@ -190,7 +190,6 @@ async fn stream_anthropic(
         }
     }
 
-    // Stream ended — send done
     let _ = app.emit(
         "ai-stream",
         AiStreamEvent {

src-tauri/src/backup.rs

@@ -207,7 +207,7 @@ pub fn restore_backup(vault_path: &str, backup_path: &str) -> Result<(), String>
             .to_string_lossy()
             .to_string();
 
-        // Keep hidden dirs (.helixnotes) — we'll handle attachments separately
+        // Keep hidden dirs (.helixnotes) - we'll handle attachments separately
         if name.starts_with('.') {
             continue;
         }

src-tauri/src/commands.rs

@@ -11,7 +11,7 @@ use tauri::{AppHandle, Manager, State};
 pub fn open_vault(app: AppHandle, state: State<'_, AppState>, path: String) -> Result<(), String> {
     operations::ensure_vault_structure(&path)?;
 
-    // Initialize search index — rebuild in background on Android (FUSE is slow)
+    // Initialize search index - rebuild in background on Android (FUSE is slow)
     let search = std::sync::Arc::new(SearchIndex::new(&path)?);
     #[cfg(target_os = "android")]
     {
@@ -430,7 +430,7 @@ pub fn get_graph_data(state: State<'_, AppState>) -> Result<crate::types::GraphD
     let vault_path = config.active_vault.as_ref().ok_or("No active vault")?;
     let vault = std::path::Path::new(vault_path);
 
-    // Pass 1: collect ALL notes as nodes (no title deduplication — every note must appear)
+    // Pass 1: collect ALL notes as nodes (no title deduplication - every note must appear)
     let mut graph_nodes = Vec::new();
     // title → list of node indices (one title can map to multiple notes in different folders)
     let mut title_to_idxs: HashMap<String, Vec<usize>> = HashMap::new();
@@ -495,7 +495,7 @@ pub fn get_graph_data(state: State<'_, AppState>) -> Result<crate::types::GraphD
         if src == tgt { return; }
         if edge_map.contains_key(&(src, tgt)) { return; } // exact duplicate
         if let Some(&rev_idx) = edge_map.get(&(tgt, src)) {
-            // Reverse direction already exists — mark it as bidirectional
+            // Reverse direction already exists - mark it as bidirectional
             edges[rev_idx].bidirectional = true;
         } else {
             let idx = edges.len();
@@ -527,7 +527,7 @@ pub fn get_graph_data(state: State<'_, AppState>) -> Result<crate::types::GraphD
                     if let Some(&target_idx) = relpath_to_idx.get(&link) {
                         add_edge(&mut edges, &mut edge_map, source_idx, target_idx);
                     } else if let Some(targets) = title_to_idxs.get(&link) {
-                        // 2. Title match — connect to all notes with this title
+                        // 2. Title match - connect to all notes with this title
                         for &target_idx in targets {
                             add_edge(&mut edges, &mut edge_map, source_idx, target_idx);
                         }
@@ -728,6 +728,32 @@ pub fn copy_image_to_clipboard(_path: String) -> Result<(), String> {
     Err("Clipboard image copy not supported on Android".to_string())
 }
 
+/// Copy PNG bytes directly to the system clipboard.
+#[cfg(not(target_os = "android"))]
+#[tauri::command]
+pub fn copy_png_to_clipboard(data: Vec<u8>) -> Result<(), String> {
+    let img = image::load_from_memory(&data)
+        .map_err(|e| format!("Failed to decode image: {}", e))?;
+    let rgba = img.to_rgba8();
+    let (w, h) = rgba.dimensions();
+    let img_data = arboard::ImageData {
+        width: w as usize,
+        height: h as usize,
+        bytes: std::borrow::Cow::Owned(rgba.into_raw()),
+    };
+    let mut clipboard = arboard::Clipboard::new()
+        .map_err(|e| format!("Clipboard init failed: {}", e))?;
+    clipboard.set_image(img_data)
+        .map_err(|e| format!("Failed to set clipboard image: {}", e))?;
+    Ok(())
+}
+
+#[cfg(target_os = "android")]
+#[tauri::command]
+pub fn copy_png_to_clipboard(_data: Vec<u8>) -> Result<(), String> {
+    Err("Clipboard image copy not supported on Android".to_string())
+}
+
 // ── Attachments ──
 
 #[tauri::command]
@@ -1459,6 +1485,13 @@ pub fn copy_file_to(source: String, destination: String) -> Result<(), String> {
     Ok(())
 }
 
+#[tauri::command]
+pub fn write_bytes_to(destination: String, data: Vec<u8>) -> Result<(), String> {
+    std::fs::write(&destination, &data).map_err(|e| format!("Failed to write file: {}", e))?;
+    Ok(())
+}
+
+
 // ── Backup ──
 
 #[tauri::command]
@@ -1717,10 +1750,10 @@ pub fn ai_ask(
 
     let mut system_prompt = "You are a helpful writing assistant inside a note-taking app called HelixNotes. \
         You help users improve, rewrite, summarize, and transform their text. \
-        Return ONLY the resulting text — no explanations, no markdown code fences, no preamble. \
+        Return ONLY the resulting text - no explanations, no markdown code fences, no preamble. \
         Preserve the original language of the text unless specifically asked to translate. \
         Preserve any markdown formatting (bold, italic, links, images, tables, etc.) unless the user asks to change it. \
-        If the text contains placeholders like __MEDIA_0__, __MEDIA_1__, etc., keep them exactly as they are in their original positions — they represent images and embedded files.".to_string();
+        If the text contains placeholders like __MEDIA_0__, __MEDIA_1__, etc., keep them exactly as they are in their original positions - they represent images and embedded files.".to_string();
 
     if let Some(ref style) = writing_style {
         system_prompt.push_str(&format!(

src-tauri/src/history.rs

@@ -157,7 +157,7 @@ fn prune_versions(dir: &Path, max: u32) -> Result<(), String> {
         .filter(|p| p.extension().map_or(false, |ext| ext == "md"))
         .collect();
 
-    // Sort by name (timestamps sort lexicographically) — newest last
+    // Sort by name (timestamps sort lexicographically) - newest last
     files.sort();
 
     if files.len() as u32 > max {

src-tauri/src/lib.rs

@@ -139,6 +139,8 @@ pub fn run() {
             commands::open_file,
             commands::open_url,
             commands::copy_file_to,
+            commands::write_bytes_to,
+            commands::copy_png_to_clipboard,
             commands::create_backup,
             commands::list_backups,
             commands::restore_backup,

src-tauri/src/types.rs

@@ -199,6 +199,10 @@ pub struct VaultState {
     pub sidebar_collapsed: bool,
     #[serde(default)]
     pub collapsed_notebooks: Vec<String>,
+    #[serde(default)]
+    pub notebook_sort_mode: String,
+    #[serde(default)]
+    pub notebook_order: std::collections::HashMap<String, i32>,
 }
 
 impl Default for VaultState {
@@ -209,6 +213,8 @@ impl Default for VaultState {
             notelist_width: 280.0,
             sidebar_collapsed: false,
             collapsed_notebooks: Vec::new(),
+            notebook_sort_mode: String::new(),
+            notebook_order: std::collections::HashMap::new(),
         }
     }
 }

src-tauri/src/vault/frontmatter.rs

@@ -61,7 +61,7 @@ pub fn parse_note(raw: &str, filename: &str) -> (NoteMeta, String) {
         .and_then(|s| parse_date_flexible(&s))
         .unwrap_or_else(Utc::now);
 
-    // Don't generate UUID on read — empty string signals "no ID yet"
+    // Don't generate UUID on read - empty string signals "no ID yet"
     let id = fm.id.unwrap_or_default();
 
     let meta = NoteMeta {
@@ -309,7 +309,7 @@ fn strip_html_and_markdown(input: &str) -> String {
             continue;
         }
 
-        // Markdown links: [text](url) — keep the text, skip the URL
+        // Markdown links: [text](url) - keep the text, skip the URL
         if ch == '[' {
             let mut link_text = String::new();
             let mut depth = 1;

src-tauri/src/vault/operations.rs

@@ -281,7 +281,7 @@ fn read_note_entry(path: &Path, vault_root: &Path) -> Result<NoteEntry, String>
 /// uses filesystem timestamps for dates. No preview text.
 #[cfg(target_os = "android")]
 fn read_note_entry_metadata_only(path: &Path, vault_root: &Path) -> Result<NoteEntry, String> {
-    // Read first 2KB — enough for frontmatter with tags, title, pinned
+    // Read first 2KB - enough for frontmatter with tags, title, pinned
     let mut file = fs::File::open(path).map_err(|e| e.to_string())?;
     let mut buf = vec![0u8; 2048];
     let bytes_read = file.read(&mut buf).map_err(|e| e.to_string())?;
@@ -917,7 +917,6 @@ pub fn get_trash_contents(vault_path: &str) -> Result<TrashContents, String> {
                 notes.push(note);
             }
         } else if path.is_dir() {
-            // Deleted notebook — count .md files inside
             let note_count = WalkDir::new(&path)
                 .min_depth(1)
                 .into_iter()

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "../node_modules/@tauri-apps/cli/config.schema.json",
   "productName": "HelixNotes",
-  "version": "1.2.8",
+  "version": "1.2.9",
   "identifier": "com.helixnotes.app",
   "build": {
     "frontendDist": "../build",

src/lib/api.ts

@@ -278,6 +278,17 @@ export async function copyFileTo(
   return invoke("copy_file_to", { source, destination });
 }
 
+export async function writeBytesTo(
+  destination: string,
+  data: Uint8Array,
+): Promise<void> {
+  return invoke("write_bytes_to", { destination, data: Array.from(data) });
+}
+
+export async function copyPngToClipboard(data: Uint8Array): Promise<void> {
+  return invoke("copy_png_to_clipboard", { data: Array.from(data) });
+}
+
 // ── Backup ──
 
 export async function createBackup(): Promise<void> {

src/lib/components/AppLayout.svelte

@@ -37,12 +37,16 @@
 		activeTag,
 		updateAvailable as globalUpdateAvailable,
 		settingsTab,
-		navHistory
+		navHistory,
+		viewerNote,
+		notebookSortMode,
+		notebookOrder
 	} from '$lib/stores/app';
 
 	const appWindow = getCurrentWindow();
 	const isMac = navigator.platform.startsWith('Mac');
 	const isMobile = /android|ios/i.test(navigator.userAgent);
+	const isAndroid = /android/i.test(navigator.userAgent);
 	import { loadVaultState, saveVaultState, readNote, createDailyNote, createBackup, getPendingOpenFile, addQuickAccess, removeQuickAccess, getQuickAccess, setTheme } from '$lib/api';
 	import { debounce } from '$lib/utils/debounce';
 	import { openNoteWindow } from '$lib/utils/window';
@@ -110,10 +114,32 @@
 		if (!filePath || !filePath.endsWith('.md')) return;
 		const config = get(appConfig);
 		const vaultRoot = config?.active_vault;
-		if (!vaultRoot || !filePath.startsWith(vaultRoot)) return;
+		const isExternal = !vaultRoot || !filePath.startsWith(vaultRoot + '/');
+
+		// External .md → viewer mode (skipped on Android)
+		if (isExternal) {
+			if (isAndroid) return;
+			try {
+				const content = await readNote(filePath);
+				editor?.flushSave();
+				$viewerNote = { path: filePath, content: content.content };
+				$activeNote = content;
+				$activeNotePath = filePath;
+				$editorDirty = false;
+				$readOnly = true;
+				$focusMode = true;
+				editor?.loadNote(filePath, content.content);
+			} catch (e) {
+				console.error('Failed to open external file:', e);
+			}
+			return;
+		}
+
+		// Vault file: normal flow
 		try {
 			const content = await readNote(filePath);
 			editor?.flushSave();
+			$viewerNote = null;
 			$activeNote = content;
 			$activeNotePath = filePath;
 			$editorDirty = false;
@@ -129,7 +155,9 @@
 			sidebar_width: $sidebarWidth,
 			notelist_width: $notelistWidth,
 			sidebar_collapsed: $sidebarCollapsed,
-			collapsed_notebooks: $collapsedNotebooks
+			collapsed_notebooks: $collapsedNotebooks,
+			notebook_sort_mode: $notebookSortMode,
+			notebook_order: $notebookOrder
 		};
 		try {
 			await saveVaultState(state);
@@ -147,6 +175,8 @@
 	}
 
 	function handleNoteSelected(path: string, content: string) {
+		// Selecting a real vault note exits viewer mode
+		$viewerNote = null;
 		editor?.loadNote(path, content);
 		if (isMobile) $mobileView = 'editor';
 	}
@@ -197,14 +227,13 @@
 			}
 			const targetDepth = view === 'sidebar' ? 0 : view === 'notelist' ? 1 : 2;
 			if (targetDepth > historyDepth) {
-				// Forward navigation — push entries for each level skipped
+				// Forward navigation - push entries for each level skipped
 				for (let d = historyDepth + 1; d <= targetDepth; d++) {
 					const v = d === 1 ? 'notelist' : 'editor';
 					history.pushState({ mobileView: v, depth: d }, '');
 				}
 				historyDepth = targetDepth;
 			} else if (targetDepth < historyDepth) {
-				// Programmatic back (e.g. mobileBack button) — go back in history
 				const steps = historyDepth - targetDepth;
 				historyDepth = targetDepth;
 				navFromPopstate = true; // suppress the popstate that history.go triggers
@@ -313,6 +342,7 @@
 		}
 		if (mod && e.shiftKey && code === 'KeyR') {
 			e.preventDefault();
+			if ($viewerNote) return; // viewer mode is always read-only
 			$readOnly = !$readOnly;
 			return;
 		}
@@ -352,6 +382,12 @@
 		persistState();
 	});
 
+	$effect(() => {
+		$notebookSortMode;
+		$notebookOrder;
+		persistState();
+	});
+
 	onMount(async () => {
 		let lastNotePath: string | null = null;
 		try {
@@ -360,6 +396,8 @@
 			$notelistWidth = state.notelist_width;
 			$sidebarCollapsed = state.sidebar_collapsed;
 			$collapsedNotebooks = state.collapsed_notebooks ?? [];
+			$notebookSortMode = state.notebook_sort_mode === 'manual' ? 'manual' : 'alphabetical';
+			$notebookOrder = state.notebook_order ?? {};
 			lastNotePath = state.last_open_note ?? null;
 		} catch (_) {}
 

src/lib/components/GraphView.svelte

@@ -54,7 +54,7 @@
 	let canvasW = 0;
 	let canvasH = 0;
 
-	// Style cache — cleared on theme change
+	// Style cache - cleared on theme change
 	let cachedStyles: { border: string; text: string; textSec: string; accent: string; bg: string } | null = null;
 
 	const FOLDER_PALETTE = [
@@ -231,14 +231,14 @@
 	}
 
 	function startSimulation() {
-		// Initial settle — enough for a rough layout, camera set after full physics
+		// Initial settle - enough for a rough layout, camera set after full physics
 		for (let i = 0; i < 80; i++) simulate();
 
 		// Show the full graph while physics finishes settling
 		fitToView();
 		draw();
 
-		// Queue remaining physics — camera will snap to active note when done
+		// Queue remaining physics - camera will snap to active note when done
 		physicsRemaining = Math.min(400, Math.max(150, nodes.length * 3));
 		startAnimLoop();
 	}
@@ -262,7 +262,7 @@
 				needsDraw = true;
 			}
 
-			// Glow pulse for active node — throttled to ~30fps
+			// Glow pulse for active node - throttled to ~30fps
 			if (activeNodeIdx >= 0) {
 				const elapsed = lastGlowTs > 0 ? Math.min(ts - lastGlowTs, 100) : 16.67;
 				if (lastGlowTs === 0 || ts - lastGlowTs >= 33) {
@@ -315,7 +315,7 @@
 			a.vx += fx; a.vy += fy; b.vx -= fx; b.vy -= fy;
 		}
 
-		// Center gravity — weaker for isolated nodes so they spread instead of clustering
+		// Center gravity - weaker for isolated nodes so they spread instead of clustering
 		for (let i = 0; i < nodeCount; i++) {
 			const node = nodes[i];
 			const gravity = (nodeDegree[i] || 0) === 0 ? 0.0002 : 0.0008;
@@ -418,7 +418,6 @@
 				ctx.lineTo(nodes[edges[i].targetIdx].x, nodes[edges[i].targetIdx].y);
 			}
 			ctx.stroke();
-			// Edges connected to search matches — brighter
 			ctx.globalAlpha = 0.4;
 			ctx.beginPath();
 			for (let i = 0; i < edges.length; i++) {
@@ -497,7 +496,7 @@
 
 			const radius = getNodeRadius(i, isActive);
 
-			// Active glow ring — opacity pulse, no radius change
+			// Active glow ring - opacity pulse, no radius change
 			if (isActive) {
 				const glowR = radius + 12;
 				const glow = ctx.createRadialGradient(node.x, node.y, radius, node.x, node.y, glowR);
@@ -524,7 +523,7 @@
 			}
 			ctx.fill();
 
-			// Active outer ring — static, alpha pulse only
+			// Active outer ring - static, alpha pulse only
 			if (isActive) {
 				ctx.globalAlpha = 0.35 + pulse * 0.3;
 				ctx.beginPath();
@@ -554,7 +553,7 @@
 			labelQueue.push({ x: node.x, y: node.y - radius - 5, text, fontSize, weight, color, alpha, priority });
 		}
 
-		// Draw labels with collision avoidance — high-priority labels drawn first
+		// Draw labels with collision avoidance - high-priority labels drawn first
 		labelQueue.sort((a, b) => a.priority - b.priority);
 		const drawnRects: LabelRect[] = [];
 		ctx.textAlign = 'center';

src/lib/components/NoteList.svelte

@@ -36,6 +36,7 @@
 	} from '$lib/api';
 	import { formatRelativeTime } from '$lib/utils/time';
 	import { openNoteWindow } from '$lib/utils/window';
+	import { revealItemInDir } from '@tauri-apps/plugin-opener';
 	import type { NoteEntry, TrashNotebookEntry, SortMode } from '$lib/types';
 
 	let { onNoteSelected = (_path: string, _content: string) => {}, onNoteMoved = () => {}, onBeforeNoteSwitch = () => {}, onNoteCreated = () => {} }: {
@@ -714,7 +715,7 @@
 			return;
 		}
 		if (e.shiftKey) {
-			// Range select — use lastClickedPath or active note as anchor
+			// Range select - use lastClickedPath or active note as anchor
 			const anchor = lastClickedPath || $activeNotePath;
 			if (!anchor) { selectNote(note); return; }
 			const paths = $sortedNotes.map(n => n.path);
@@ -731,7 +732,6 @@
 			}
 			return;
 		}
-		// Normal click — clear selection, open note
 		clearSelection();
 		selectNote(note);
 	}
@@ -1311,6 +1311,14 @@
 				</svg>
 				Open in New Window
 			</button>
+			{#if !isMobile}
+			<button onclick={async () => { const n = contextMenu!.note; contextMenu = null; try { await revealItemInDir(n.path); } catch (e) { console.error('Failed to reveal in file manager:', e); } }}>
+				<svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+					<path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z"/>
+				</svg>
+				Show in File Manager
+			</button>
+			{/if}
 			<button onclick={() => startRename(contextMenu!.note)}>
 				<svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
 					<path d="M17 3a2.85 2.85 0 114 4L7.5 20.5 2 22l1.5-5.5Z"/><path d="m15 5 4 4"/>

src/lib/components/SettingsPanel.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { showSettings, theme, appConfig, updateAvailable as globalUpdateAvailable, updateObj as globalUpdateObj, installType, settingsTab, vaultReady, androidApkUrl, checkForUpdateMobile } from '$lib/stores/app';
+	import { showSettings, theme, appConfig, updateAvailable as globalUpdateAvailable, updateObj as globalUpdateObj, installType, settingsTab, vaultReady, androidApkUrl, checkForUpdateMobile, notebookSortMode } from '$lib/stores/app';
 	import { setTheme, setAccentColor, setFontSize, setFontFamily, setLineHeight, setGeneralSettings, importObsidian, createBackup, listBackups, restoreBackup, deleteBackup, setBackupSettings, setAiSettings, testAiConnection } from '$lib/api';
 	import { open as openDialog } from '@tauri-apps/plugin-dialog';
 	import { listen } from '@tauri-apps/api/event';
@@ -599,6 +599,20 @@
 								</label>
 							</div>
 
+							<div class="settings-section">
+								<h3>Notebooks</h3>
+								<label class="setting-toggle">
+									<span class="setting-label">
+										<span class="setting-name">Sort order</span>
+										<span class="setting-desc">Alphabetical (default) or manual. Drag notebooks above/below each other to reorder.</span>
+									</span>
+								</label>
+								<div class="setting-options" style="margin-top: 8px;">
+									<button class="option-btn" class:active={$notebookSortMode === 'alphabetical'} onclick={() => { $notebookSortMode = 'alphabetical'; }}>Alphabetical</button>
+									<button class="option-btn" class:active={$notebookSortMode === 'manual'} onclick={() => { $notebookSortMode = 'manual'; }}>Manual</button>
+								</div>
+							</div>
+
 							<div class="settings-section">
 								<h3>Time Format</h3>
 								<div class="setting-options">
@@ -717,6 +731,7 @@
 								</label>
 							</div>
 
+
 							{#if !isMobile}
 							<div class="settings-section">
 								<h3>PDF Preview</h3>

src/lib/components/Sidebar.svelte

@@ -16,7 +16,9 @@
 		appConfig,
 		quickAccessPaths,
 		collapsedNotebooks,
-		rootNoteCount
+		rootNoteCount,
+		notebookSortMode,
+		notebookOrder
 	} from '$lib/stores/app';
 	import { getNotebooks, getAllTags, createNotebook, deleteNotebook, renameNotebook, moveNotebook, getNotebookIcons, setNotebookIcon, saveAttachment, getQuickAccess, addQuickAccess, removeQuickAccess, emptyTrash, moveNote, readNote, getNotes, countRootNotes } from '$lib/api';
 	import { open as openDialog } from '@tauri-apps/plugin-dialog';
@@ -36,7 +38,23 @@
 	let newNotebookName = $state('');
 	let showNewNotebook = $state(false);
 	let dropTargetPath = $state<string | null>(null);
+	let dropPosition = $state<'above' | 'into' | 'below' | null>(null);
 	let draggedNotebookPath = $state<string | null>(null);
+
+	// Apply manual ordering recursively when in 'manual' sort mode.
+	// In 'alphabetical' mode the Rust scanner already sorts, so we pass through unchanged.
+	function sortNotebooksTree(tree: NotebookEntry[]): NotebookEntry[] {
+		if ($notebookSortMode !== 'manual') return tree;
+		const order = $notebookOrder;
+		const sorted = [...tree].sort((a, b) => {
+			const oa = order[a.path] ?? Number.MAX_SAFE_INTEGER;
+			const ob = order[b.path] ?? Number.MAX_SAFE_INTEGER;
+			if (oa !== ob) return oa - ob;
+			return a.name.toLowerCase().localeCompare(b.name.toLowerCase());
+		});
+		return sorted.map(nb => ({ ...nb, children: sortNotebooksTree(nb.children) }));
+	}
+	let sortedNotebooks = $derived(sortNotebooksTree($notebooks));
 	let contextMenu = $state<{ x: number; y: number; notebook: NotebookEntry } | null>(null);
 	let trashContextMenu = $state<{ x: number; y: number } | null>(null);
 	let tagsCollapsed = $state(true);
@@ -265,6 +283,94 @@
 		}
 	}
 
+	function findSiblingsOfPath(tree: NotebookEntry[], parentPath: string, vaultRoot: string): NotebookEntry[] {
+		if (parentPath === vaultRoot) return tree;
+		for (const nb of tree) {
+			if (nb.path === parentPath) return nb.children;
+			if (nb.children.length > 0) {
+				const found = findSiblingsOfPath(nb.children, parentPath, vaultRoot);
+				if (found.length > 0) return found;
+			}
+		}
+		return [];
+	}
+
+	async function handleNotebookReorder(srcPath: string, targetPath: string, position: 'above' | 'below') {
+		dropTargetPath = null;
+		dropPosition = null;
+		draggedNotebookPath = null;
+		if (srcPath === targetPath) return;
+		if (targetPath.startsWith(srcPath + '/')) return; // can't move into descendant
+		const vaultRoot = $appConfig?.active_vault;
+		if (!vaultRoot) return;
+
+		const srcParent = srcPath.substring(0, srcPath.lastIndexOf('/'));
+		const targetParent = targetPath.substring(0, targetPath.lastIndexOf('/'));
+		let actualSrcPath = srcPath;
+
+		try {
+			// Step 1: if different parents, move src into target's parent first
+			if (srcParent !== targetParent) {
+				const oldName = srcPath.split('/').pop() || '';
+				const newPath = targetParent === vaultRoot
+					? vaultRoot + '/' + oldName
+					: targetParent + '/' + oldName;
+				await moveNotebook(srcPath, targetParent);
+				// Migrate paths in collapsedNotebooks
+				$collapsedNotebooks = $collapsedNotebooks.map(p => {
+					if (p === srcPath) return newPath;
+					if (p.startsWith(srcPath + '/')) return newPath + p.slice(srcPath.length);
+					return p;
+				});
+				// Migrate paths in notebookOrder
+				const migrated: Record<string, number> = {};
+				for (const [p, v] of Object.entries($notebookOrder)) {
+					if (p === srcPath) migrated[newPath] = v;
+					else if (p.startsWith(srcPath + '/')) migrated[newPath + p.slice(srcPath.length)] = v;
+					else migrated[p] = v;
+				}
+				$notebookOrder = migrated;
+				// Update active notebook/note
+				if ($activeNotebook?.path === srcPath || $activeNotebook?.path.startsWith(srcPath + '/')) {
+					selectAllNotes();
+				}
+				if ($activeNotePath && $activeNotePath.startsWith(srcPath + '/')) {
+					const newNotePath = newPath + $activeNotePath.slice(srcPath.length);
+					$activeNotePath = newNotePath;
+					$activeNote = await readNote(newNotePath);
+				}
+				$notebookIcons = await getNotebookIcons();
+				await refresh();
+				actualSrcPath = newPath;
+			}
+
+			// Step 2: reorder within target's parent
+			const siblings = findSiblingsOfPath($notebooks, targetParent, vaultRoot);
+			const sortedSiblings = sortNotebooksTree(siblings);
+			const without = sortedSiblings.filter(s => s.path !== actualSrcPath);
+			const targetIdx = without.findIndex(s => s.path === targetPath);
+			if (targetIdx === -1) return;
+			const insertIdx = position === 'above' ? targetIdx : targetIdx + 1;
+			const newSequence = [
+				...without.slice(0, insertIdx).map(s => s.path),
+				actualSrcPath,
+				...without.slice(insertIdx).map(s => s.path),
+			];
+
+			// Assign sequential positions to all siblings (only within this parent)
+			const newOrder = { ...$notebookOrder };
+			newSequence.forEach((path, idx) => {
+				newOrder[path] = idx;
+			});
+			$notebookOrder = newOrder;
+
+			// Auto-enable manual mode (the act of reordering implies user wants this)
+			if ($notebookSortMode !== 'manual') $notebookSortMode = 'manual';
+		} catch (e) {
+			console.error('Failed to reorder notebook:', e);
+		}
+	}
+
 	function startRename(nb: NotebookEntry) {
 		contextMenu = null;
 		editingNotebook = nb.path;
@@ -499,7 +605,7 @@
 						<span class="notebook-name">Unfiled Notes <span class="notebook-count">{$rootNoteCount}</span></span>
 					</button>
 				{/if}
-				{#each $notebooks as nb (nb.path)}
+				{#each sortedNotebooks as nb (nb.path)}
 					{@render notebookItem(nb, 0)}
 				{/each}
 			</div>
@@ -649,13 +755,15 @@
 		<button
 			class="notebook-item"
 			class:active={$viewMode === 'notebook' && $activeNotebook?.path === nb.path}
-			class:drop-target={dropTargetPath === nb.path}
+			class:drop-target={dropTargetPath === nb.path && dropPosition === 'into'}
+			class:drop-above={dropTargetPath === nb.path && dropPosition === 'above'}
+			class:drop-below={dropTargetPath === nb.path && dropPosition === 'below'}
 			style="padding-left: {8 + depth * 16}px"
 			draggable="true"
 			onclick={() => selectNotebook(nb)}
 			oncontextmenu={(e) => onContextMenu(e, nb)}
 			ondragstart={(e) => { draggedNotebookPath = nb.path; e.dataTransfer!.setData('text/plain', nb.path); e.dataTransfer!.effectAllowed = 'move'; }}
-			ondragend={() => { draggedNotebookPath = null; }}
+			ondragend={() => { draggedNotebookPath = null; dropPosition = null; }}
 			ondragover={(e) => {
 				e.preventDefault();
 				if (draggedNotebookPath) {
@@ -664,17 +772,33 @@
 						e.dataTransfer!.dropEffect = 'none';
 						return;
 					}
-					// Prevent no-op (already in this parent)
+				}
+				// Decide drop position from cursor Y within the row: top 30% = above, bottom 30% = below, middle = into
+				const rect = (e.currentTarget as HTMLElement).getBoundingClientRect();
+				const relY = (e.clientY - rect.top) / rect.height;
+				let pos: 'above' | 'into' | 'below';
+				if (draggedNotebookPath && relY < 0.3) pos = 'above';
+				else if (draggedNotebookPath && relY > 0.7) pos = 'below';
+				else pos = 'into';
+				// For 'into', reject if already in that parent (no-op)
+				if (pos === 'into' && draggedNotebookPath) {
 					const parentDir = draggedNotebookPath.substring(0, draggedNotebookPath.lastIndexOf('/'));
 					if (parentDir === nb.path) { e.dataTransfer!.dropEffect = 'none'; return; }
 				}
 				e.dataTransfer!.dropEffect = 'move';
 				dropTargetPath = nb.path;
+				dropPosition = pos;
 			}}
-			ondragleave={() => { if (dropTargetPath === nb.path) dropTargetPath = null; }}
+			ondragleave={() => { if (dropTargetPath === nb.path) { dropTargetPath = null; dropPosition = null; } }}
 			ondrop={(e) => {
+				e.preventDefault();
+				const pos = dropPosition;
 				if (draggedNotebookPath) {
-					handleNotebookDrop(e, nb.path);
+					if (pos === 'above' || pos === 'below') {
+						handleNotebookReorder(draggedNotebookPath, nb.path, pos);
+					} else {
+						handleNotebookDrop(e, nb.path);
+					}
 				} else {
 					handleNoteDrop(e, nb);
 				}
@@ -909,6 +1033,12 @@
 		outline-offset: -2px;
 		border-radius: 6px;
 	}
+	.notebook-item.drop-above {
+		box-shadow: 0 -2px 0 0 var(--accent);
+	}
+	.notebook-item.drop-below {
+		box-shadow: 0 2px 0 0 var(--accent);
+	}
 
 	.chevron {
 		display: flex;

src/lib/components/TitleBar.svelte

@@ -31,7 +31,7 @@
 		const target = e.target as HTMLElement;
 		if (target.closest('.titlebar-controls') || target.closest('.titlebar-actions')) return;
 
-		// Don't start dragging near window edges — let Tauri handle resize
+		// Don't start dragging near window edges - let Tauri handle resize
 		if (!maximized) {
 			const rect = (e.currentTarget as HTMLElement).getBoundingClientRect();
 			if (e.clientY - rect.top < RESIZE_EDGE || e.clientX - rect.left < RESIZE_EDGE) return;
@@ -39,7 +39,6 @@
 
 		const now = Date.now();
 		if (now - lastMouseDown < 300) {
-			// Double-click detected — maximize/restore
 			appWindow.toggleMaximize();
 			lastMouseDown = 0;
 			return;

src/lib/components/VaultPicker.svelte

@@ -154,7 +154,7 @@
 				<span class="vault-path-hint">{fullPath}</span>
 			</div>
 		{:else}
-			<p class="description">Your notes are stored as standard Markdown (.md) files. Pick any folder — existing .md files will be recognized automatically.</p>
+			<p class="description">Your notes are stored as standard Markdown (.md) files. Pick any folder - existing .md files will be recognized automatically.</p>
 		{/if}
 
 		{#if error}

src/lib/stores/app.ts

@@ -29,6 +29,13 @@ export const notebookIcons = writable<Record<string, string>>({});
 export const quickAccessPaths = writable<string[]>([]);
 export const collapsedNotebooks = writable<string[]>([]);
 
+// Notebook sort: 'alphabetical' (default) or 'manual' (drag-to-reorder, persisted in notebookOrder).
+export const notebookSortMode = writable<"alphabetical" | "manual">(
+  "alphabetical",
+);
+// Map from notebook absolute path → ordinal position (lower = earlier). Only consulted when notebookSortMode === 'manual'.
+export const notebookOrder = writable<Record<string, number>>({});
+
 // Data
 export const notebooks = writable<NotebookEntry[]>([]);
 export const rootNoteCount = writable<number>(0);
@@ -39,6 +46,13 @@ export const activeNotePath = writable<string | null>(null);
 export const activeNotebook = writable<NotebookEntry | null>(null);
 export const activeTag = writable<string | null>(null);
 
+// External-file viewer mode: set when an .md file outside the active vault is opened.
+// While set, the editor is forced read-only, autosave is suppressed, and a banner
+// offering "Import to vault" / "Close" is shown.
+export const viewerNote = writable<{ path: string; content: string } | null>(
+  null,
+);
+
 // Mobile state
 export const mobileView = writable<"sidebar" | "notelist" | "editor">(
   "sidebar",
@@ -71,7 +85,7 @@ export async function checkForUpdate() {
       updateObj.set(update);
     }
   } catch {
-    // Silent fail — don't disrupt app startup
+    // Silent fail - don't disrupt app startup
   }
 }
 
@@ -174,6 +188,8 @@ export const vaultState = derived(
     notelistWidth,
     sidebarCollapsed,
     collapsedNotebooks,
+    notebookSortMode,
+    notebookOrder,
   ],
   ([
     $activeNotePath,
@@ -181,6 +197,8 @@ export const vaultState = derived(
     $notelistWidth,
     $sidebarCollapsed,
     $collapsedNotebooks,
+    $notebookSortMode,
+    $notebookOrder,
   ]) => {
     return {
       last_open_note: $activeNotePath,
@@ -188,6 +206,8 @@ export const vaultState = derived(
       notelist_width: $notelistWidth,
       sidebar_collapsed: $sidebarCollapsed,
       collapsed_notebooks: $collapsedNotebooks,
+      notebook_sort_mode: $notebookSortMode,
+      notebook_order: $notebookOrder,
     } satisfies VaultState;
   },
 );

src/lib/types.ts

@@ -86,6 +86,8 @@ export interface VaultState {
   notelist_width: number;
   sidebar_collapsed: boolean;
   collapsed_notebooks: string[];
+  notebook_sort_mode?: string;
+  notebook_order?: Record<string, number>;
 }
 
 export interface SearchResult {

src/routes/+layout.svelte

@@ -67,7 +67,7 @@
 					}
 				}
 			}
-			// Internal .md note link — navigate within the app
+			// Internal .md note link - navigate within the app
 			if (absPath.endsWith('.md')) {
 				readNote(absPath).then((content) => {
 					activeNote.set({ ...content, content: content.content });