feat(editor): resizable outline panel (#161)

Add a drag handle to resize the outline panel and persist its width in
vault state (outline_width). Outline text now scales with the editor
font size.

Reviewed-on: https://codeberg.org/ArkHost/HelixNotes/pulls/161

src/lib/components/AppLayout.svelte

@@ -14,6 +14,7 @@
 	import {
 		sidebarWidth,
 		notelistWidth,
+		outlineWidth,
 		sidebarCollapsed,
 		notelistCollapsed,
 		collapsedNotebooks,
@@ -201,6 +202,7 @@
 			last_open_note: $activeNotePath,
 			sidebar_width: $sidebarWidth,
 			notelist_width: $notelistWidth,
+			outline_width: $outlineWidth,
 			sidebar_collapsed: $sidebarCollapsed,
 			notelist_collapsed: $notelistCollapsed,
 			collapsed_notebooks: $collapsedNotebooks,
@@ -534,6 +536,7 @@
 	$effect(() => {
 		$sidebarCollapsed;
 		$notelistCollapsed;
+		$outlineWidth;
 		persistState();
 	});
 
@@ -573,6 +576,7 @@
 			const state = await loadVaultState();
 			$sidebarWidth = state.sidebar_width;
 			$notelistWidth = state.notelist_width;
+			if (typeof state.outline_width === 'number') $outlineWidth = state.outline_width;
 			$sidebarCollapsed = state.sidebar_collapsed;
 			$notelistCollapsed = state.notelist_collapsed ?? false;
 			$collapsedNotebooks = state.collapsed_notebooks ?? [];

src/lib/components/Editor.svelte

@@ -39,7 +39,7 @@
 	import { readFile } from '@tauri-apps/plugin-fs';
 	import { openFile, openUrl, copyFileTo, copyImageToClipboard as copyImageToClipboardCmd, writeBytesTo, copyPngToClipboard } from '$lib/api';
 	import { save as saveDialog } from '@tauri-apps/plugin-dialog';
-	import { activeNote, activeNotePath, appConfig, editorDirty, sourceMode, focusMode, readOnly, quickAccessPaths, notes, navHistory, canGoBack, canGoForward, viewerNote, notebooks } from '$lib/stores/app';
+	import { activeNote, activeNotePath, appConfig, editorDirty, sourceMode, focusMode, readOnly, quickAccessPaths, notes, navHistory, canGoBack, canGoForward, viewerNote, notebooks, outlineWidth } from '$lib/stores/app';
 	import { saveNote, saveImage, saveAttachment, readClipboardImage, addQuickAccess, removeQuickAccess, getQuickAccess, getNoteVersions, getNoteVersionContent, createVersion, aiAsk, getAllNoteTitles, readNote, renameNote } from '$lib/api';
 	import type { VersionEntry, AiStreamEvent, NoteTitleEntry } from '$lib/types';
 	import { listen } from '@tauri-apps/api/event';
@@ -50,6 +50,7 @@
 	import GraphView from './GraphView.svelte';
 	import TagSuggestInput from './TagSuggestInput.svelte';
 	import { isMobile, isAndroid } from '$lib/platform';
+	import ResizeHandle from './ResizeHandle.svelte';
 
 	const modKey = navigator.platform.startsWith('Mac') ? '⌘' : 'Ctrl';
 
@@ -178,6 +179,10 @@
 		outlineHeadings = headings;
 	}
 
+	function handleOutlineResize(delta: number) {
+		$outlineWidth = Math.max(160, Math.min(500, $outlineWidth - delta));
+	}
+
 	function scrollToHeading(pos: number) {
 		if (!editor) return;
 		editor.commands.setTextSelection(pos + 1);
@@ -5502,7 +5507,8 @@
 				</div>
 			{/if}
 			{#if showOutline}
-				<div class="outline-panel">
+				<ResizeHandle onResize={handleOutlineResize} />
+				<div class="outline-panel" style="width: {$outlineWidth}px">
 					<div class="outline-header">
 						<h3>Outline</h3>
 						<button class="outline-close" onclick={() => { showOutline = false; }}>
@@ -7475,7 +7481,7 @@
 
 	.outline-empty {
 		padding: 16px 14px;
-		font-size: 12px;
+		font-size: var(--editor-font-size, 14px);
 		color: var(--text-tertiary);
 		line-height: 1.5;
 	}
@@ -7493,7 +7499,7 @@
 		background: none;
 		border: none;
 		padding: 4px 14px;
-		font-size: 12px;
+		font-size: var(--editor-font-size, 14px);
 		color: var(--text-secondary);
 		cursor: pointer;
 		white-space: nowrap;

src/lib/stores/app.ts

@@ -26,6 +26,7 @@ export const sidebarCollapsed = writable(false);
 export const notelistCollapsed = writable(false);
 export const sidebarWidth = writable(220);
 export const notelistWidth = writable(280);
+export const outlineWidth = writable(220);
 export const searchQuery = writable("");
 export const showCommandPalette = writable(false);
 export const showSearch = writable(false);
@@ -227,6 +228,7 @@ export const vaultState = derived(
     activeNotePath,
     sidebarWidth,
     notelistWidth,
+    outlineWidth,
     sidebarCollapsed,
     notelistCollapsed,
     collapsedNotebooks,
@@ -238,6 +240,7 @@ export const vaultState = derived(
     $activeNotePath,
     $sidebarWidth,
     $notelistWidth,
+    $outlineWidth,
     $sidebarCollapsed,
     $notelistCollapsed,
     $collapsedNotebooks,
@@ -249,6 +252,7 @@ export const vaultState = derived(
       last_open_note: $activeNotePath,
       sidebar_width: $sidebarWidth,
       notelist_width: $notelistWidth,
+      outline_width: $outlineWidth,
       sidebar_collapsed: $sidebarCollapsed,
       notelist_collapsed: $notelistCollapsed,
       collapsed_notebooks: $collapsedNotebooks,

src/lib/types.ts

@@ -129,6 +129,7 @@ export interface VaultState {
   last_open_note: string | null;
   sidebar_width: number;
   notelist_width: number;
+  outline_width?: number;
   sidebar_collapsed: boolean;
   notelist_collapsed: boolean;
   collapsed_notebooks: string[];