plat 643

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PLAT-643: Show the extension version and update status in the browser panel

Field	Value
State	fixed on main
Priority	P2
Product	browser
Area	browser
Summary	The browser panel shows the connected Browser Bridge version and whether an update is available

Why

Owner, 2026-10-07: after PLAT-636 shipped Browser Bridge 0.4.8, the local Chrome still ran 0.4.6 from an unpacked folder in Downloads, and nothing in the app said so.

What changed

• The relay records the version the connected extension reports in its diagnostics (connection_paired is sent right after pairing). Only a short dotted number is accepted. A new connection starts with no version.
• The server reads the latest version from the manifest.json in the extension zip it ships for download.
• GET /api/browser/extension returns extension_version and latest_extension_version.
• The browser panel's status card shows "Browser Bridge 0.4.8 · up to date", or an amber "Browser Bridge 0.4.6 · update to 0.4.8" with how to update and a download button. An extension too old to report a version shows "version unknown".

Verification

Server builds; browserrelay tests pass; the server reads 0.4.8 from the bundled zip. Frontend type check clean; workflow component tests pass apart from 3 failures already on main (WorkspacePanelGuideButton x2, workspaceToolbarPlacement). Not yet seen in the running app: check the panel after the next local restart.