feat: improve responsive Web shell and sticky navigation

[WangEn]

Summary

• make the Workspace secondary navigation sticky below the private utility bar
• prevent medium-width navigation clipping by letting both nav rows scroll internally without widening the document
• hide secondary brand text on tablet widths and dedicate the full secondary bar to navigation on phones
• align internal sticky sidebars/forms below both sticky navigation rows
• improve mobile Launcher heading, command footer and result-row spacing
• add Chromium layout smoke coverage for 1280 / 900 / 720 / 390px

Responsive contract

• primary utility bar: sticky at top: 0, height 46px
• Workspace secondary bar: sticky at top: 46px, height 64px
• document/body must not gain horizontal overflow
• phone navigation may overflow only inside its own horizontally scrollable nav container

Validation

• typecheck / build / Cloudflare dry-run
• Cloudflare Workers Preview
• Chromium Web responsive shell smoke
• existing Chromium Extension + New Tab smoke
• Firefox package validation

No Extension behavior or release version changes.

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	dockmark	63ce98e	Commit Preview URL Branch Preview URL	Sep 18 2026, 02:48 AM