feat(analysis): admin analysis section uses manga search + chapter picker

Replaces the raw manga-id / chapter-id UUID inputs with a real picker:

- Search a manga (debounced, reuses listAdminMangas) → result rows show
  title + chapter count; "Queue manga" enqueues the whole manga.
- Expand a result to load its chapters (listAdminChapters) and "Queue
  chapter" enqueues a single chapter.
- Keeps the "Queue all (whole library)" action and a single global
  "include already-analyzed" toggle applied to every action; per-action
  busy state + a result message naming what was queued.

Tests: rewrote the Playwright spec to drive the search → manga/chapter
flow (whole library, search+queue manga, expand+queue chapter with
include-analyzed). svelte-check + build clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/Cargo.lock

@@ -1517,7 +1517,7 @@ checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 
 [[package]]
 name = "mangalord"
-version = "0.73.0"
+version = "0.74.0"
 dependencies = [
  "anyhow",
  "argon2",

backend/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mangalord"
-version = "0.73.0"
+version = "0.74.0"
 edition = "2021"
 default-run = "mangalord"