Fix filtered scan startup and MPEG-TS worker playback

[kristofferR]

Summary

• derive group/name-filtered scan previews from the existing full in-memory preview cache
• preserve stable channel indices, metadata, content counts, and directory group behavior
• allow blob-backed MPEG-TS workers through the Tauri CSP
• probe worker execution once and fall back to inline transmuxing if startup is blocked

Root cause

Filtered scan settings were part of the preview cache key, so the first scan after selecting a group or source filter missed the already-loaded full preview and reparsed very large playlists from disk.

MPEG-TS playback enabled the mpegts.js blob worker, but the app CSP did not permit blob workers. The asynchronous worker failure left mpegts.js waiting without ever requesting the localhost proxy/remux route.

Validation

• bun run test:frontend — 90 passed
• bun run typecheck
• cargo test --manifest-path src-tauri/Cargo.toml test_filter_cached_preview_matches_filtered_parse
• cargo check in src-tauri
• bun tauri build --debug --bundles app
• installed debug bundle passed strict local signature verification and launched successfully

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 589b4485-ae2c-4f8e-85a3-8c32086c006c

📥 Commits

Reviewing files that changed from the base of the PR and between 5b8e5e9 and 2df1fb6.

📒 Files selected for processing (7)

• src-tauri/src/commands/scan.rs
• src-tauri/src/engine/parser.rs
• src-tauri/src/state.rs
• src-tauri/tauri.conf.json
• src/hooks/useStreamPlayer.ts
• src/lib/workerSupport.ts
• tests/workerSupport.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/fix-scan-cache-playback-worker

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[kristofferR]

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Reviewed commit: 1d7dc07054

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Codex Review: Didn't find any major issues. Already looking forward to the next diff.

Reviewed commit: 2df1fb6dfc

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