feat: add HLS deep-probe scanning with refactored pipeline and cleanup

- Deep-probe HLS manifests via known player globals, inline scripts, config objects
- Scan main frame only (no nested iframes); pick largest visible video per tab
- Store mediaType/hlsManifest metadata through the pipeline
- CSP-safe interceptor injection via script.src (not inline textContent)
- Remove probeFn/scrapeFn from Vite build entries (non-existent files)
- Refactor: extract m3u8DeepProbeFn, scrapeFn, scanVideos, storeVideos,
  makeVideoEntry, filterValidTabs, probeHlsManifests, dedupManifests, scrapeTab
  to module-level functions (no inline closures recreated on every click)
- Clean up viewer.js: extract createVideoElement(), createPanel(),
  consolidate HLS_CONFIG, remove console.log noise
- Add DEBUG flag to gate console output in popup
- Unify url/src fields — prefer 'src' everywhere
- Remove dead code in renderList and setTimeout(100) hack

.eslintignore

@@ -0,0 +1 @@
+dist/