fix(desktop): stabilize composer during session switches and resizing - #5513
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Keep the composer and model controls stable as session state changes, and restore drafts before paint. Preserve permission and usage controls while their session-specific data resolves, with a compact pending usage state. Set a 520px minimum conversation width and keep footer controls on one line as available space narrows. Add regression coverage for the layout and session transition behavior. Generated-by: Codex
Constrain the left footer slot to the width left by the fixed send action and let the model label shrink sooner in narrow conversations. Generated-by: Codex
Apply width constraints to the Selector Field wrapper and preserve the start of model labels when truncating. Place the pending usage accessibility state on its value node and update the affected assertions. Generated-by: Codex
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Summary
Switching Sessions could briefly show controls from the previous Session, while narrow Composer widths could compress the footer into the send button. An empty Composer could also show the branch icon through the translucent disabled Send button.
This change keeps the Composer footer on one row with a 520px minimum conversation width, preserves fixed space for Send, prevents stale session branch state from painting during a switch, and gives the Send/Stop slot an opaque backing while keeping the existing disabled appearance.
The Workbar remains under user control; narrow widths do not automatically move or collapse it.
Before / After
media-before.mp4
Kapture.2026-09-20.at.16.19.50.mp4
switch-flicker-before.mp4
switch-flicker-after.mp4
Verification
git diff --checkpassed.npm --workspace @maka/desktop run check:architecture -- --base d0dd3edf202f120c5ea950825160dfd02b426145 --strict-basepassed, including 112 architecture checker tests.AI use
Tool(s) and scope: Codex assisted with the Composer behavior, layout, usage state, and regression coverage. The commit carries
Generated-by: Codex.Checklist
Does this PR entail a change in behavior?