fix(mobile): rotate snoozed and settled shelf chevrons

[lnieuwenhuis]

The Snoozed and Settled shelf chevrons on the mobile threads list never moved and pointed in opposite directions: both headers swapped between the chevron.up/chevron.down SF Symbols based on expanded state, but the native symbol view does not redraw when only the symbol name changes, so each chevron stayed frozen at whatever direction it first rendered.

Fixed by matching the disclosure-chevron convention already shipped in ConnectionEnvironmentRow and CloudEnvironmentRows: keep a single chevron.down symbol and rotate it 180° with a state-driven style transform. Both headers now follow the same rule (down when collapsed, up when expanded) and give feedback on every tap. No continuous animation — the transform only changes with the expanded state.

Before: the issue's screenshots (fig1–fig3 at https://t3code-chevron-shots.pages.dev/) show Snoozed open pointing down while Settled closed points up. After-screenshots were not captured — this change was made without simulator access; happy to add them on request.

Verification: vp run typecheck in apps/mobile (exit 0) and vp lint on the changed file (0 warnings). No test exists for this presentational component and no behavior contract changed, so none was added.

Fixes #7121

Claude Fable 5 via Claude Code

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Note

Low Risk
Presentational-only change to two shelf header icons; no logic, API, or data handling.

Overview
Snoozed and Settled thread-list shelf headers now show chevrons that actually flip when you expand or collapse the section.

Both headers used to swap SF Symbol names (chevron.up / chevron.down) with expanded, but the native SymbolView does not reliably redraw when only the name changes, so the icons stayed stuck on their first render (and could point the wrong way).

The fix matches ConnectionEnvironmentRow and CloudEnvironmentRows: always use chevron.down and drive direction with a style transform rotate (0deg collapsed, 180deg expanded). No animation—only the transform updates with state.

^{Reviewed by Cursor Bugbot for commit b8d1176. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Rotate snoozed and settled shelf chevrons on expand instead of swapping glyphs

Replaces the conditional chevron.up/chevron.down glyph swap in ThreadListV2SnoozedShelfHeader and ThreadListV2SettledShelfHeader with a CSS transform that rotates a fixed chevron.down icon 180° when expanded. This produces a smoother visual transition and removes the need for conditional icon names.

^{Macroscope summarized b8d1176.}

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[macroscopeapp]

Approvability

Verdict: Approved b8d1176

Minor UI adjustment that changes chevron icons to animate via rotation instead of swapping icons. The change is purely cosmetic, self-contained, and has no impact on business logic or runtime behavior.

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