Recover prepared Control Center improvements

[waml]

Summary

Recover the prepared Control Center work that was preserved in the local afd4cef commit but did not make it into the published 0.2.0/0.2.1 releases.

This PR is intentionally targeted on top of current main instead of trying to merge the disconnected historical branch wholesale.

Restored from the prepared work

• Governor card layout: title, narrow two-column numeric fields, visible safe defaults, and digit-only inputs.
• Governor risk acknowledgement: the word risks opens a detailed disclaimer modal explaining high-frequency automation risks and what the governor limits do.
• Unsaved settings protection: live refresh no longer silently wipes in-progress governor edits.
• Footer/status UI: compact two-line footer with activity summary and color-coded status messages instead of one long/truncated line.
• Bulk visibility bridge: exposes setTabsVisible, showAllTabs, and hideAllTabs through preload/main IPC so the header toggle can use the desktop bridge directly.
• Browser selector order: Chrome CDP is listed before Electron in Control Center.

Validation

• node --check ui/control-center.js
• node --check main.mjs
• node --check ui/preload.mjs
• node --check ui/preload.cjs
• git diff --check
• npm test passed: 162/162
• npm pack --dry-run --json: version 0.2.2, 40 files, no private workflow matches

Note

I am not merging or publishing this without explicit approval. This PR is for review of the recovered work first.