Filter and restore archived sidebar threads

[brsbl]

Human comments

What was wrong

Archived threads were absent from the sidebar hierarchy and could not be restored directly from their rows.

What changed

• Filter Active and Archived in the combined sidebar menu, preserving sections, projects, machines, pins, and nesting.
• Restore desktop rows with a persistent Unarchive action; mobile hides the action.
• Remember filtering in this browser only. No SDK, plugin API, server contract, or CLI changes remain.

Keyboard focus uses the shared thin ring. Menu contents and customization remain lazy-loaded within the existing startup budget.

How you verified

• Candidate: 73b10b3b38ab769ccc505daa110f22f0d76772d0, based on e06c73571506052b5543472a494def311f3724a3.
• Exact-head CI: all 13 jobs passed.
• PR CI: all scheduled checks passed.
• Chrome for Testing 153.0.8010.52 verified the exact source web app with a fresh isolated server and 20 synthetic threads.
• Desktop and compact filtering, local persistence, nonempty selection, nested menu navigation, and accessible app-root checks passed.
• Desktop restoration preserved sidebar row order and the current route with Active and Archived selected.

Whole-build verification is complete at 73b10b3b38. Historical comparisons retain their actual SHAs below; the final slimming commit changes tests only.

Review and follow-ups

The explicitly requested #3933 Slop Cop source review at c2f3cbd1b found zero P0/P1 and three P2 follow-ups. Security and performance found none; architecture and correctness findings were deduplicated.

• Archived-only restoration removes its row while pending and recreates it on failure.
• Mixed archived pins can enter active-only reorder requests, which the server rejects.
• Visible archived metadata can remain stale after remote edits.

These P2s were recorded, not implemented. The known compact-menu owner-removal focus issue and native iOS verification gap remain.

Slim PR removes 130 net test lines across three files by consolidating menu/filter transitions and duplicate rollback coverage. Restore, hierarchy metadata, paging, local persistence, cold keyboard loading, and compact navigation remain covered. Production code and public APIs are unchanged by this pass.

Earlier sidebar user QA was approved at 3fc3fdbc4. The user explicitly authorized merging #3933 after final validation.

Historical keyboard-focus evidence

Before: main baseline 699f2f1a8bfb0f22337ec30a0d5d53548baf56b9 · After: 706650ed60db0de8710a512fbd13cd3d31095907. Same fixture, route, focus target, scroll, theme, viewport and 2× density; full viewport, no cropped upper context. Mobile is compact web with hardware-keyboard focus, not native iOS.

State	Viewport	Before	After
Keyboard focus · light	Desktop · 1440×900	Open before	Open after
Keyboard focus · dark	Desktop · 1440×900	Open before	Open after
Keyboard focus · light	Mobile · 390×844	Open before	Open after

Historical sidebar filter and hierarchy evidence

Before: main baseline 699f2f1a8bfb0f22337ec30a0d5d53548baf56b9 · After: 706650ed60db0de8710a512fbd13cd3d31095907. Same synthetic fixture, route, light theme, viewport and 2× density. Main has no Filter submenu, so those before images show its preceding combined menu. Archived comparisons show main’s active hierarchy with the same stored archived threads.

State	Viewport	Before	After
Combined menu	Desktop · 1440×900	Open before	Open after
Filter · Active selected	Desktop · 1440×900	Open before	Open after
Active and Archived · existing hierarchy	Desktop · 1440×900	Open before	Open after
Archived only	Desktop · 1440×900	Open before	Open after
Combined menu	Mobile · 390×844	Open before	Open after
Filter · Active selected	Mobile · 390×844	Open before	Open after
Active and Archived · existing hierarchy	Mobile · 390×844	Open before	Open after
Archived only	Mobile · 390×844	Open before	Open after

BB-Thread-ID: thr_cevdspix6j

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