v1.1.3 - Line numbers scroll fix, source mode undo/redo, Ctrl+K links, hard break fixes

- Line numbers scroll fix: source mode line numbers now scroll properly with content
- Source mode undo/redo: custom history stack for Ctrl+Z / Ctrl+Shift+Z in markdown mode
- Shift+Enter hard breaks in source mode (inserts trailing spaces + newline)
- Ctrl+K link shortcut: global keybinding for inserting/editing links
- Link modal improvements: auto-prepends https://, preserves selection range
- Hard break serialization fix: trailing spaces preserved in markdown output
- Drag prevention: prevents native text drag (copy-instead-of-move issue in Tauri webview)

src/lib/components/AppLayout.svelte

@@ -170,6 +170,10 @@
 			e.preventDefault();
 			editor?.forceSave();
 		}
+		if (mod && e.key === 'k' && !e.shiftKey && $activeNotePath && !$sourceMode) {
+			e.preventDefault();
+			editor?.addLinkFromToolbar();
+		}
 		if (mod && e.shiftKey && e.key === 'M') {
 			e.preventDefault();
 			$sourceMode = !$sourceMode;