M3 wiki-links: [[links]] + backlinks

- Migration 0009: note_links (source_id, target_norm). Parse [[...]] from body on
  create/update and rewrite the source's links. GET /api/notes/titles (owner
  {id,title} index for client-side resolution); GET /api/notes/<id>/backlinks.
- Frontend: titles store; LinkedText renders [[Title]] styled on cards; editor
  shows Links (outgoing, resolve/create-on-click) + Linked-from (backlinks),
  clicking navigates the editor to the target note (board + search).
- notes store: fetchOne, createTitled. DB-free link-parser tests.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FRgehjoz7Yv8LkUfADxACm

frontend/src/components/NoteCard.vue

@@ -3,6 +3,7 @@ import { useNotesStore } from "../stores/notes";
 import { NOTE_CARD_CLASSES, type NoteColor } from "../notes/colors";
 import type { Note } from "../stores/notes";
 import Icon from "./Icon.vue";
+import LinkedText from "./LinkedText.vue";
 import NoteChecklist from "./NoteChecklist.vue";
 
 defineProps<{ note: Note; reorderable?: boolean }>();
@@ -61,9 +62,9 @@ function cardClass(color: NoteColor): string {
       <h3 v-if="note.title" class="mb-1 break-words text-sm font-semibold text-neutral-900 dark:text-neutral-100">
         {{ note.title }}
       </h3>
-      <p v-if="note.body" class="whitespace-pre-wrap break-words text-sm text-neutral-700 dark:text-neutral-300">
-        {{ note.body }}
-      </p>
+      <div v-if="note.body" class="text-sm text-neutral-700 dark:text-neutral-300">
+        <LinkedText :text="note.body" />
+      </div>
       <p v-if="!note.title && !note.body && !note.attachments.length" class="text-sm italic text-neutral-400">
         Empty note
       </p>