Create notes from empty list double-click (#175)

Double-clicking empty space in the notes list now creates a new note. The notebook sidebar double-click shortcut is scoped to the notebook section so adjacent panes do not trigger notebook creation.

Reviewed-on: https://codeberg.org/ArkHost/HelixNotes/pulls/175

src/lib/components/NoteList.svelte

@@ -449,6 +449,14 @@
 		}
 	}
 
+	function handleListDoubleClick(e: MouseEvent) {
+		const target = e.target as HTMLElement | null;
+		if (target?.closest('button, input, .note-item, .context-menu, .sort-menu, .batch-move-picker, .cal')) return;
+		e.stopPropagation();
+		if ($viewMode === 'tasks' || $viewMode === 'trash') return;
+		handleCreateNote();
+	}
+
 	async function handleRename(note: NoteEntry) {
 		if (!editValue.trim() || editValue.trim() === note.meta.title) {
 			editingNote = null;
@@ -1079,7 +1087,8 @@
 		</div>
 	{/if}
 
-	<div class="list-content" bind:this={listContainer} onscroll={onListScroll}>
+	<!-- svelte-ignore a11y_no_static_element_interactions -->
+	<div class="list-content" bind:this={listContainer} onscroll={onListScroll} ondblclick={handleListDoubleClick}>
 		{#if $viewMode === 'tasks'}
 			<TasksView onOpenTask={openTask} onToggleTask={onToggleTask} onSetTaskPriority={onSetTaskPriority} onSetTaskDue={onSetTaskDue} />
 		{/if}

src/lib/components/Sidebar.svelte

@@ -636,7 +636,7 @@
 
 <svelte:window onclick={handleWindowClick} />
 
-<aside class="sidebar" class:collapsed={$sidebarCollapsed} class:mobile={isMobile} class:nav-empty={!anyNavItem} ondblclick={startNewNotebookFromSidebar}>
+<aside class="sidebar" class:collapsed={$sidebarCollapsed} class:mobile={isMobile} class:nav-empty={!anyNavItem}>
 	{#if !isMobile}
 	<div class="sidebar-header">
 		<button class="collapse-btn" onclick={() => ($sidebarCollapsed = !$sidebarCollapsed)} title="Toggle sidebar">
@@ -733,7 +733,8 @@
 		</nav>
 		{/if}
 
-		<div class="section">
+		<!-- svelte-ignore a11y_no_static_element_interactions -->
+		<div class="section" ondblclick={startNewNotebookFromSidebar}>
 			<!-- svelte-ignore a11y_no_static_element_interactions -->
 			<div
 				class="section-header"