Split shell into editor-pane, sidebar-pane, and notes-pane features

Extract editor-pane (pane component, find bar, conflict footer,
scroll header hook) and sidebar-pane (pane component, tag tree,
notes section, rename dialog, keyboard nav, navigation lib) into
their own feature directories. Rename notes/ to notes-pane/ for
consistency. Shell is now a slim orchestration layer.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ChristianChiarulli

app/src/app.tsx

@@ -10,11 +10,11 @@ import { CommandPalette } from "@/features/command-palette";
 import { BootstrapError } from "@/features/shell/ui/bootstrap-error";
 import { ConflictResolutionDialog } from "@/features/shell/ui/conflict-resolution-dialog";
 import { DeletePublishDialog } from "@/features/shell/ui/delete-publish-dialog";
-import { EditorPane } from "@/features/shell/editor-pane";
+import { EditorPane } from "@/features/editor-pane";
 import { NoteHistoryDialog } from "@/features/shell/note-history-dialog";
-import { NotesPane } from "@/features/notes/ui/notes-pane";
+import { NotesPane } from "@/features/notes-pane/ui/notes-pane";
 import { PublishDialog, PublishShortNoteDialog } from "@/features/publishing";
-import { SidebarPane } from "@/features/shell/sidebar-pane";
+import { SidebarPane } from "@/features/sidebar-pane";
 import { useAppShortcuts } from "@/features/shell/use-app-shortcuts";
 import { useRevealMainWindow } from "@/features/shell/use-reveal-main-window";
 import { useShellController } from "@/features/shell/use-shell-controller";

…/shell/hooks/use-editor-scroll-header.ts …r-pane/hooks/use-editor-scroll-header.tsapp/src/features/shell/hooks/use-editor-scroll-header.ts renamed to app/src/features/editor-pane/hooks/use-editor-scroll-header.ts app/src/features/shell/hooks/use-editor-scroll-header.ts renamed to app/src/features/editor-pane/hooks/use-editor-scroll-header.ts

@@ -13,7 +13,7 @@ import {
   isNotesSearchShortcut,
 } from "@/shared/lib/keyboard";
 import { resolveActiveEditorSearch } from "@/shared/lib/search";
-import { OPEN_EDITOR_FIND_EVENT } from "@/features/shell/ui/editor-pane-utils";
+import { OPEN_EDITOR_FIND_EVENT } from "@/features/editor-pane/lib/editor-pane-utils";
 
 export function useFindBar({
   noteId,

…src/features/shell/hooks/use-find-bar.ts …atures/editor-pane/hooks/use-find-bar.tsapp/src/features/shell/hooks/use-find-bar.ts renamed to app/src/features/editor-pane/hooks/use-find-bar.ts app/src/features/shell/hooks/use-find-bar.ts renamed to app/src/features/editor-pane/hooks/use-find-bar.ts

@@ -0,0 +1 @@
+export { EditorPane } from "./ui/editor-pane";

app/src/features/editor-pane/index.ts

@@ -2,7 +2,7 @@ import { ChevronLeft, ChevronRight } from "lucide-react";
 
 import { Button } from "@/shared/ui/button";
 import { type NoteConflictInfo } from "@/shared/api/types";
-import { formatConflictHeadTimestamp } from "@/features/shell/ui/editor-pane-utils";
+import { formatConflictHeadTimestamp } from "@/features/editor-pane/lib/editor-pane-utils";
 
 type ViewableSnapshot = NoteConflictInfo["snapshots"][number];
 

…c/features/shell/ui/editor-pane-utils.ts …res/editor-pane/lib/editor-pane-utils.tsapp/src/features/shell/ui/editor-pane-utils.ts renamed to app/src/features/editor-pane/lib/editor-pane-utils.ts app/src/features/shell/ui/editor-pane-utils.ts renamed to app/src/features/editor-pane/lib/editor-pane-utils.ts

@@ -40,11 +40,11 @@ import {
   buildEditorMenu,
   firstLineH1Title,
   isEditableElement,
-} from "@/features/shell/ui/editor-pane-utils";
-import { useEditorScrollHeader } from "@/features/shell/hooks/use-editor-scroll-header";
-import { useFindBar } from "@/features/shell/hooks/use-find-bar";
-import { EditorFindBar } from "@/features/shell/ui/editor-find-bar";
-import { ConflictResolutionFooter } from "@/features/shell/ui/conflict-resolution-footer";
+} from "@/features/editor-pane/lib/editor-pane-utils";
+import { useEditorScrollHeader } from "@/features/editor-pane/hooks/use-editor-scroll-header";
+import { useFindBar } from "@/features/editor-pane/hooks/use-find-bar";
+import { EditorFindBar } from "@/features/editor-pane/ui/editor-find-bar";
+import { ConflictResolutionFooter } from "@/features/editor-pane/ui/conflict-resolution-footer";
 
 type EditorPaneProps = {
   availableTagPaths: string[];