Prepare unified scan workflow for Firefox 1.3.5

[abduljawada]

Change

Prepare the local beta's unified scan interface as public Firefox version 1.3.5. Popup, sidebar, and pop-out now share a single scan flow, expandable options, candidate/watch tabs, and value editor. This version sorts above the local beta's browser version 1.3.4.1.

Integrates with the scan/reset, pause, and background recovery fixes already on main. Updates browser and game helpers to the new controls while preserving gameplay, cancellation, pause, lifecycle, and provenance assertions. Chrome publication remains disabled.

Validation

• Package/source build, package validation, and Firefox lint passed.
• Unit suite: 200 passed, 3 skipped; focused helper suite: 53 passed.
• Packaged Firefox/Chrome regressions passed, including worker recovery.
• Browser capture integration: 20 passed.
• Strict local qualification passed all eight configurations (report 2026-09-29T06-34-55.646Z-33356).
• Initial CI 36531973396 remains failed: three cancellation cases completed between playback timer samples, leaving pause unproven. The observation repair adds read-only sampling of the rendered player, using its actual public playback state and sub-millisecond timestamps. Cancellation timing and strict overlap requirements remain unchanged. Focused checks: 32 passed. Fresh full CI 36533531867 is running; merge/release remains blocked until it passes.
• Separate advisory live-site compatibility still reports website access, automation, and observation failures; controlled results do not claim those sites passed.

A stable release tag is a separate publishing step after checks pass. Original uncommitted work remains preserved in its workspace.