feat(gui): morph the sidebar collapse instead of swapping renders

The collapse read as a hard cut: only the track width animated while the panel content swapped instantly and the rail icons bore no relation to the expanded layout. Now the four control rows persist across the transition — collapse toggle, new session, new workspace, search, the same top-down order as their expanded rows — and morph their geometry (row heights, paddings, margins, capsule borders) on the deepsuite curve, so each rail icon is its expanded control converging onto the 56px axis. Wide-only content (brand, labels, input, session tree) cross-fades over 200ms, stays mounted while the collapse animates, and unmounts at the 300ms settle, still dropping the sessions subscription. The search query moves up to the root and survives the round trip; rail search focuses the surviving input after expand instead of remount-autofocus.
2026-07-23 13:03:32 +08:00
parent 5da8e3b787
commit 698f46b0c9
8 changed files with 413 additions and 217 deletions
@@ -14,7 +14,7 @@ The layout maps a closed sidebar (persisted width `0`) to the fixed `SIDEBAR_COL

 `AppFrame` marks the sidebar collapsed from the persisted width preference rather than from the resolved track width, removes the resize handle while collapsed, and passes `collapsed` to the sidebar slot as owner props from the render site. Collapse and expand animate: the frame transitions `grid-template-columns` (and the remaining handle its `left`) on the deepsuite sider curve — `--ds-ease-in-out` over `--ds-transition-duration-slow`, both supplied by ui-theme's base sheet; transitions pause during drags and under `prefers-reduced-motion`.

-`SidebarRoot` reads the owner `collapsed` prop. Its collapsed render is the rail: expand toggle, new session, search, and new workspace icons (each aligned with its expanded counterpart's behavior — the search icon expands the sidebar and focuses the search box) plus the `Settings` foot. The brand, capsule button, search field, and session tree leave the rendered and accessibility trees — the body component unmounts, dropping its sessions subscription.
+`SidebarRoot` reads the owner `collapsed` prop and morphs in place rather than swapping renders: the four control rows persist into the rail — expand toggle, new session, new workspace, search, in the same top-down order as their expanded rows — animating their geometry (heights, paddings, margins, capsule borders) on the same curve, each aligned with its expanded counterpart's behavior (the search icon expands the sidebar and focuses the search box). Wide-only content (brand, labels, input, session tree) cross-fades out over 200ms, stays mounted while the collapse animates, and unmounts once the 300ms settle passes — dropping the sessions subscription and leaving the rendered and accessibility trees. The search query lives with the root and survives the round trip.

 ## Alternatives considered