Remove [[wiki-links]], backlinks and the graph

Operator, 2026-08-22 (note 2897): ThoughtSync is an intermediary surface. You
write here because it's easy — a notebook in your pocket — and later you recall
the thing and go finish it somewhere else. Recall is the product; organization
is secondary. A linking system is organization, and it isn't what this is for.

So: `[[wiki-links]]`, backlinks, the `[[` autocomplete, the note_links table,
`/api/notes/link-search`, `/api/notes/<id>/backlinks`, the whole graph blueprint
and GraphView. Rust core loses `extract_links`, `backlinks`, `link_search` and
`create_titled`; the desktop loses the three Tauri commands that exposed them.

This subsumes 982d24c rather than reverting it. That commit bound links to a
note id so a rename would stop rewriting other notes' bodies — real infra, but
infra for a feature that is now gone, and nothing it added survives. Alembic
0023 stays in the chain anyway: it shipped in an image and may already be
applied, and deleting an applied revision strands a database's version pointer.
0024 drops the table and takes the column with it. The history stays honest
about the fact that it existed for a day.

Two things deliberately kept, because they were serving recall and only
incidentally serving links:

- `/api/notes/titles` and the titles store. The command palette lists them so
  you can jump to a note by name. `resolve()` — the name→note lookup that only
  linking needed — is gone.
- `display_title`. Every note still has a name for search results and export
  filenames. What that name is FOR changed; that it exists did not.

`notes/links.py` is now `notes/tags.py`, holding the #tag→label reconciliation
it always also owned. A file called links.py with no links in it would have been
exactly the drift this removal is meant to end.

Also swept out on the way: `_escape_like`, whose only caller was link-search,
and the `graph` icon. Nothing lost that a person typed — note_links was always
derived, and the `[[text]]` is still sitting in every body it was written in.

frontend/src/adapters/local.ts

@@ -16,7 +16,7 @@ import type { Device } from "../stores/devices";
 import type { TitleEntry } from "../stores/titles";
 import type { User } from "../stores/session";
 import type { PublicConfig } from "../stores/config";
-import type { Backlink, DeviceToken, ImportResult, Repo } from "./repo";
+import type { DeviceToken, ImportResult, Repo } from "./repo";
 
 const NEEDS_SERVER = "That's not available offline — connect a server to use it.";
 
@@ -51,7 +51,6 @@ export const local: Repo = {
     list: (query) => invoke<Note[]>("notes_list", { query }),
     get: (id) => invoke<Note>("notes_get", { id }),
     create: (input) => invoke<Note>("notes_create", { input }),
-    createTitled: (title) => invoke<Note>("notes_create_titled", { title }),
     update: (id, changes) => invoke<Note>("notes_update", { id, changes }),
     completeReminder: (id) => invoke<Note>("notes_complete_reminder", { id }),
     snoozeReminder: (id, minutes) => invoke<Note>("notes_snooze_reminder", { id, minutes }),
@@ -73,8 +72,6 @@ export const local: Repo = {
     reminders: () => invoke<Note[]>("notes_reminders"),
     titles: () => invoke<TitleEntry[]>("notes_titles"),
     search: (q) => invoke<Note[]>("notes_search", { q }),
-    backlinks: (id) => invoke<Backlink[]>("notes_backlinks", { id }),
-    linkSearch: (q) => invoke<TitleEntry[]>("notes_link_search", { q }),
   },
 
   savedFilters: {