feat(subtitles): improve mpv hovered-token highlighting flow

- add subtitleStyle.hoverTokenColor config default + validation

- normalize hover color payloads and propagate configured color to mpv runtime

- refresh invisible overlay tokenization with current subtitle text and tighten hover overlay cleanup hooks

- record TASK-98 and subagent coordination updates

src/core/services/subtitle-processing-controller.test.ts

@@ -99,3 +99,16 @@ test('subtitle processing can refresh current subtitle without text change', asy
     { text: 'same', tokens: [] },
   ]);
 });
+
+test('subtitle processing refresh can use explicit text override', async () => {
+  const emitted: SubtitleData[] = [];
+  const controller = createSubtitleProcessingController({
+    tokenizeSubtitle: async (text) => ({ text, tokens: [] }),
+    emitSubtitle: (payload) => emitted.push(payload),
+  });
+
+  controller.refreshCurrentSubtitle('initial');
+  await flushMicrotasks();
+
+  assert.deepEqual(emitted, [{ text: 'initial', tokens: [] }]);
+});

src/core/services/subtitle-processing-controller.ts

@@ -9,7 +9,7 @@ export interface SubtitleProcessingControllerDeps {
 
 export interface SubtitleProcessingController {
   onSubtitleChange: (text: string) => void;
-  refreshCurrentSubtitle: () => void;
+  refreshCurrentSubtitle: (textOverride?: string) => void;
 }
 
 export function createSubtitleProcessingController(
@@ -87,7 +87,10 @@ export function createSubtitleProcessingController(
       latestText = text;
       processLatest();
     },
-    refreshCurrentSubtitle: () => {
+    refreshCurrentSubtitle: (textOverride?: string) => {
+      if (typeof textOverride === 'string') {
+        latestText = textOverride;
+      }
       if (!latestText.trim()) {
         return;
       }