feat: add app-owned YouTube subtitle flow with absPlayer-style parsing (#31)

* fix: harden preload argv parsing for popup windows

* fix: align youtube playback with shared overlay startup

* fix: unwrap mpv youtube streams for anki media mining

* docs: update docs for youtube subtitle and mining flow

* refactor: unify cli and runtime wiring for startup and youtube flow

* feat: update subtitle sidebar overlay behavior

* chore: add shared log-file source for diagnostics

* fix(ci): add changelog fragment for immersion changes

* fix: address CodeRabbit review feedback

* fix: persist canonical title from youtube metadata

* style: format stats library tab

* fix: address latest review feedback

* style: format stats library files

* test: stub launcher youtube deps in CI

* test: isolate launcher youtube flow deps

* test: stub launcher youtube deps in failing case

* test: force x11 backend in launcher ci harness

* test: address latest review feedback

* fix(launcher): preserve user YouTube ytdl raw options

* docs(backlog): update task tracking notes

* fix(immersion): special-case youtube media paths in runtime and tracking

* feat(stats): improve YouTube media metadata and picker key handling

* fix(ci): format stats media library hook

* fix: address latest CodeRabbit review items

* docs: update youtube release notes and docs

* feat: auto-load youtube subtitles before manual picker

* fix: restore app-owned youtube subtitle flow

* docs: update youtube playback docs and config copy

* refactor: remove legacy youtube launcher mode plumbing

* fix: refine youtube subtitle startup binding

* docs: clarify youtube subtitle startup behavior

* fix: address PR #31 latest review follow-ups

* fix: address PR #31 follow-up review comments

* test: harden youtube picker test harness

* udpate backlog

* fix: add timeout to youtube metadata probe

* docs: refresh youtube and stats docs

* update backlog

* update backlog

* chore: release v0.9.0

config.example.jsonc

@@ -187,7 +187,7 @@
   // ==========================================
   // Secondary Subtitles
   // Dual subtitle track options.
-  // Used by subminer YouTube subtitle generation as secondary language preferences.
+  // Used by the YouTube subtitle loading flow as secondary language preferences.
   // Hot-reload: defaultMode updates live while SubMiner is running.
   // ==========================================
   "secondarySub": {
@@ -414,24 +414,24 @@
   }, // Jimaku API configuration and defaults.
 
   // ==========================================
-  // YouTube Subtitle Generation
-  // Defaults for SubMiner YouTube subtitle generation.
+  // YouTube Playback Settings
+  // Defaults for SubMiner YouTube subtitle loading and languages.
   // ==========================================
   "youtubeSubgen": {
-    "whisperBin": "", // Path to whisper.cpp CLI used as fallback transcription engine.
-    "whisperModel": "", // Path to whisper model used for fallback transcription.
-    "whisperVadModel": "", // Path to optional whisper VAD model used for subtitle generation.
-    "whisperThreads": 4, // Thread count passed to whisper.cpp subtitle generation runs.
-    "fixWithAi": false, // Use shared AI provider to post-process whisper-generated YouTube subtitles. Values: true | false
+    "whisperBin": "", // Legacy compatibility path kept for external subtitle fallback tools; not used by default.
+    "whisperModel": "", // Legacy compatibility model path kept for external subtitle fallback tooling; not used by default.
+    "whisperVadModel": "", // Legacy compatibility VAD path kept for external subtitle fallback tooling; not used by default.
+    "whisperThreads": 4, // Legacy thread tuning for subtitle fallback tooling; not used by default.
+    "fixWithAi": false, // Legacy subtitle fallback post-processing switch kept for compatibility; use is currently disabled by default. Values: true | false
     "ai": {
-      "model": "", // Optional model override for YouTube subtitle AI post-processing.
-      "systemPrompt": "" // Optional system prompt override for YouTube subtitle AI post-processing.
+      "model": "", // Optional model override for legacy subtitle fallback post-processing; not used by default.
+      "systemPrompt": "" // Optional system prompt override for legacy subtitle fallback post-processing; not used by default.
     }, // Ai setting.
     "primarySubLanguages": [
       "ja",
       "jpn"
     ] // Comma-separated primary subtitle language priority used by the launcher.
-  }, // Defaults for SubMiner YouTube subtitle generation.
+  }, // Defaults for SubMiner YouTube subtitle loading and languages.
 
   // ==========================================
   // Anilist