refactor(main): move domains into per-domain assemblies (#309)

* refactor(main): move the YouTube domain into an assembly

createYoutubeAssembly owns the YouTube flow, playback, media cache,
whisper subtitles, primary-subtitle notifications, and the in-app
browser, plus the browser quit-on-close state. main.ts builds it once
where the first YouTube runtime used to be and calls through the result.
Siblings built later are passed as getters or callbacks; tests pin that
construction calls none of them.

* docs(architecture): describe per-domain assemblies

* test(e2e): blank the line before mining the sub-delay cue

The previous test leaves the same cue on screen, so the overlay check
passed before the seek landed and --mine-sentence could read mpv's empty
mid-seek sub-text and skip the card.

* refactor(main): move the Jellyfin domain into an assembly

createJellyfinAssembly owns the Jellyfin composer call, its playback and
remote-progress state, the subtitle cache IO, mpv defaults, and the tray
discovery deps. main.ts builds it where the composer call used to be and
reads state through getActivePlayback/getQuitOnDisconnectArmed.

* refactor(main): move the AniList domain into an assembly

createAnilistAssembly owns the AniList setup and tracking composer calls,
the setup window, the state runtime, and the token, media-guess, in-flight
and attempted-update state they share. main.ts builds it where the setup
composer call used to be and keeps the rate limiter, which the stats
cover-art fetcher also uses.

* refactor(main): move config hot-reload, settings, and sync UI into assemblies

createSettingsAssembly owns config hot-reload and the settings window,
which share the hot-reload-applied handler; main.ts still supplies that
handler's cross-domain deps and the Yomitan deck-name helper.
createSyncAssembly owns the sync window, sync IPC runtime, and auto-sync
scheduler. Both are built where their blocks were; main.ts keeps the
registerHandlers()/start() calls at the same points.

* refactor(main): move dictionary runtimes into assemblies

createDictionariesAssembly owns the JLPT and frequency lookups and their
dictionary-root builders; main.ts still resolves the root paths at the
same point. createCharacterDictionaryAssembly owns the character
dictionary runtime, Yomitan auto-sync, and the portrait and name-candidate
lookups. Both are built where their blocks were; later siblings (Yomitan
profile policy, notifications, OSD, subtitle refresh) come in as getters
or callbacks.

* refactor(main): move overlay modal openers into an assembly

createOverlayModalsAssembly owns the shared open-with-notification helper
and the runtime options, Jimaku, TsukiHime, subtitle generation, session
help, changelog, character dictionary manager, controller, and playlist
browser openers. main.ts builds it where the openers used to live.

* refactor(logger): export the Logger type for assembly deps

The build emits declarations, and the Jellyfin assembly returns the logger
in its tray discovery deps, so tsc needs a nameable Logger type. Assemblies
now Pick from it directly.

docs-site/architecture.md

@@ -24,6 +24,7 @@ src/
   preload*.ts             # preload bridges (overlay, settings, stats, sync, Jellyfin setup)
   main/                   # main-process runtime modules and IPC/CLI wiring
     boot/                 # pre-ready boot helpers
+    assemblies/           # per-domain assemblies main.ts builds once (YouTube, Jellyfin, AniList, settings, sync, dictionaries, overlay modals)
     runtime/composers/    # larger runtime clusters assembled for main.ts
     runtime/domains/      # domain barrels (startup, overlay, mpv, ipc, shortcuts, anilist, jellyfin, mining)
   core/services/          # focused services: mpv client, overlay, tokenizer, mining, integrations, stats
@@ -138,7 +139,7 @@ Runtime code uses dependency injection:
 2. Build its runtime dependencies in a `src/main/` module. Pass simple dependencies inline; extract an adapter only when it adds behavior or gets reused.
 3. Call the service from lifecycle or command wiring.
 
-`main.ts` gets domain handlers through `createMainRuntimeRegistry()` (`src/main/runtime/registry.ts`), which exposes the barrels in `src/main/runtime/domains/`. Larger clusters, such as app-ready startup, mpv, Jellyfin, AniList tracking, shortcuts, and IPC, are assembled by composers in `src/main/runtime/composers/`. Handlers take their dependencies as a plain object passed straight to the handler factory, which keeps side effects out of the unit under test.
+`main.ts` gets domain handlers through `createMainRuntimeRegistry()` (`src/main/runtime/registry.ts`), which exposes the barrels in `src/main/runtime/domains/`. Larger clusters, such as app-ready startup, mpv, Jellyfin, AniList tracking, shortcuts, and IPC, are assembled by composers in `src/main/runtime/composers/`. A domain whose runtimes share state, such as YouTube, Jellyfin, AniList, config settings, sync, or the character dictionary, is grouped into one assembly in `src/main/assemblies/` that owns that state and returns its runtimes. Handlers take their dependencies as a plain object passed straight to the handler factory, which keeps side effects out of the unit under test.
 
 Composers declare their inputs with `ComposerInputs<T>` and results with `ComposerOutputs<T>` from `src/main/runtime/composers/contracts.ts`. A missing dependency then fails at compile time.