[LinuxDevil]

Polish batch from the final review: --scrim token, status pills not colour-only in the agent rail, two restored accessible names, sticky panels whose footers stay reachable, and canvas fit/selection resets.

Ticket: R4 (Agent Forge Studio redesign, audit/forge-redesign/PLAN.md)

Changes

• test(studio): rail-status shot waits on the socket state; overflow review shots; thread link asserted by its text
• fix(studio): sticky rubric card and hub entry cap at the scroll container's height, not the viewport's
• fix(studio): canvas refits a refilled empty graph and drops edge selection on agent switch
• fix(studio): restore the "Add rubric row" and "Back to threads" names
• fix(studio): unsaved and errored agent rows spell their status in a pill, not colour alone
• style(studio): --scrim token for the nav drawer; sticky rubric card and hub entry scroll inside the viewport

Verification: focused vitest, tsc --noEmit, eslint, affected Playwright specs, light + dark screenshots reviewed; full suite and fallow run in CI.

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