Browse actions and mobile shelves

[brsbl]

Human comments

What was wrong

Browse lacked a nearby Plugin Guide action. The hero and long mobile shelves pushed discovery down the page, and See all expanded shelves inline.

What changed

• Plugin Guide opens in the current workspace, automatically enabling it or offering installation when needed.
• See all opens dedicated shelf pages with category headings and a link back to Browse.
• Mobile Browse shows two-card previews and hides the promotional hero while keeping Create available.
• Guide sits left of Create; BB and News01 identify curated shelves, with underlined See all beside each title.

How you verified

• Remote CI: tests, checks, and packaging smoke tests passed on d5fa7d819.
• Post-merge CI: all 13 jobs passed on merge commit c024cea.
• Chrome for Testing 153.0.8010.36: same-tab Guide opening, enable/retry, installation, and cancellation passed.
• Desktop 1440×900 and mobile 390×844: shelf navigation, Create, category presentation, and the 640px hero breakpoint passed.
• Query-sensitive shelf checks passed: 22 entries narrowed to 12, excluded nonmembers, showed no matches, and cleared back to 22.

Screenshots compare main d89160eb with branch d5fa7d819, using matching fixtures and viewports at 2× density.

Surface	Before — main	After — branch
Browse actions · 1440×900
Browse actions · 390×844
Browse shelves · 1440×900
Browse shelves · 390×844
Category page · 1440×900	Pending capture of main’s inline expansion
Category page · 390×844	Pending capture of main’s inline expansion

BB-Thread-ID: thr_c7hh9tvnj3

AGENT GENERATED