feat: add magic note tags and a two-pane notes layout

Keep the notes list beside the open note, compact the detail view with a full-width sticky toolbar, and make Back to overview return to a full-width all-notes grid. Add manual note tags with AND filtering, a tag manager for rename, merge and delete, schema 51 tag tables, and tag support in the note Agent tools.

src/preload/index.ts

@@ -159,6 +159,7 @@ import type {
   MagicNoteCreateResult,
   MagicNoteSummary,
   MagicNoteEntryCreateResult,
+  MagicNoteTagRenameResult,
   MagicNotesSnapshot,
   MagicTodoItem,
   MagicTodoStatus,
@@ -1667,6 +1668,14 @@ const desktopApi: DesktopApi = {
     remove: async (noteId: string) => {
       await ipcRenderer.invoke(ipcChannels.magicNotesDelete, { noteId })
     },
+    renameTag: (input) =>
+      ipcRenderer.invoke(
+        ipcChannels.magicNotesRenameTag,
+        input
+      ) as Promise<MagicNoteTagRenameResult>,
+    removeTag: async (tagId: string) => {
+      await ipcRenderer.invoke(ipcChannels.magicNotesDeleteTag, { tagId })
+    },
     createEntry: (input) =>
       ipcRenderer.invoke(
         ipcChannels.magicNotesCreateEntry,