fix: strip inline subtitle markup from sidebar cues

backlog/tasks/task-247 - Strip-inline-subtitle-markup-from-subtitle-sidebar-cues.md

@@ -0,0 +1,60 @@
+---
+id: TASK-247
+title: Strip inline subtitle markup from subtitle sidebar cues
+status: Done
+assignee:
+  - codex
+created_date: '2026-03-29 10:01'
+updated_date: '2026-03-29 10:10'
+labels: []
+dependencies: []
+references:
+  - src/core/services/subtitle-cue-parser.ts
+  - src/renderer/modals/subtitle-sidebar.ts
+  - src/core/services/subtitle-cue-parser.test.ts
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Subtitle sidebar should display readable subtitle text when loaded subtitle files include inline markup such as HTML-like font tags. Parsed cue text currently preserves markup, causing raw tags to appear in the sidebar instead of clean subtitle content.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Subtitle sidebar cue text omits inline subtitle markup such as HTML-like font tags while preserving visible subtitle content.
+- [x] #2 Parsed subtitle cues used by the sidebar keep timing order and expected line-break behavior after markup sanitization.
+- [x] #3 Regression tests cover markup-bearing subtitle cue parsing so raw tags do not reappear in the sidebar.
+<!-- AC:END -->
+
+## Implementation Plan
+
+<!-- SECTION:PLAN:BEGIN -->
+1. Add regression tests in src/core/services/subtitle-cue-parser.test.ts for subtitle cues containing HTML-like font tags, including multi-line content.
+2. Verify the new parser test fails against current behavior to confirm the bug is covered.
+3. Update src/core/services/subtitle-cue-parser.ts to sanitize inline subtitle markup while preserving visible text and expected newline handling.
+4. Re-run focused parser tests, then run broader verification commands required for handoff as practical.
+5. Update task notes/acceptance criteria based on verified results and finalize the task record.
+<!-- SECTION:PLAN:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+User approved implementation on 2026-03-29.
+
+Implemented parser-level subtitle cue sanitization for HTML-like tags so loaded sidebar cues render readable text while preserving cue line breaks.
+
+Added regression coverage for SRT and ASS cue parsing with <font ...> markup.
+
+Verification: bun test src/core/services/subtitle-cue-parser.test.ts; bun run typecheck; bun run test:fast; bun run test:env; bun run build; bun run test:smoke:dist.
+<!-- SECTION:NOTES:END -->
+
+## Final Summary
+
+<!-- SECTION:FINAL_SUMMARY:BEGIN -->
+Sanitized parsed subtitle cue text in src/core/services/subtitle-cue-parser.ts so HTML-like inline markup such as <font ...> is removed before cues reach the subtitle sidebar. The sanitizer is shared across SRT/VTT-style parsing and ASS parsing, while existing cue timing and line-break semantics remain intact.
+
+Added regression tests in src/core/services/subtitle-cue-parser.test.ts covering markup-bearing SRT lines and ASS dialogue lines with \N breaks, and verified the original failure before implementing the fix.
+
+Tests run: bun test src/core/services/subtitle-cue-parser.test.ts; bun run typecheck; bun run test:fast; bun run test:env; bun run build; bun run test:smoke:dist.
+<!-- SECTION:FINAL_SUMMARY:END -->