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

src/renderer/index.html

@@ -85,6 +85,36 @@
           </div>
         </div>
       </div>
+      <div id="youtubePickerModal" class="modal hidden" aria-hidden="true">
+        <div class="modal-content youtube-picker-content">
+          <div class="modal-header">
+            <div class="modal-title">YouTube Subtitle Tracks</div>
+            <button id="youtubePickerCloseButton" class="modal-close" type="button">
+              Continue without subtitles
+            </button>
+          </div>
+          <div class="modal-body youtube-picker-body">
+            <div id="youtubePickerTitle" class="youtube-picker-title"></div>
+            <div class="youtube-picker-grid">
+              <label class="youtube-picker-field">
+                <span>Primary subtitle</span>
+                <select id="youtubePickerPrimarySelect"></select>
+              </label>
+              <label class="youtube-picker-field">
+                <span>Secondary subtitle</span>
+                <select id="youtubePickerSecondarySelect"></select>
+              </label>
+            </div>
+            <div id="youtubePickerStatus" class="youtube-picker-status"></div>
+            <ul id="youtubePickerTracks" class="youtube-picker-tracks"></ul>
+            <div class="youtube-picker-footer">
+              <button id="youtubePickerContinueButton" class="kiku-confirm-button" type="button">
+                Use selected subtitles
+              </button>
+            </div>
+          </div>
+        </div>
+      </div>
       <div id="kikuFieldGroupingModal" class="modal hidden" aria-hidden="true">
         <div class="modal-content">
           <div class="modal-header">