umputun / agterm / 28730575245

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feat: persist workspace expand/collapse state across relaunch

Each workspace's sidebar expand/collapse state now survives a relaunch instead of every workspace reopening on launch.

Adds `Workspace.isExpanded` (default true), persisted as the optional inverse `WorkspaceSnapshot.collapsed`. Only a collapsed workspace writes it, so an all-expanded tree serializes byte-identically to a legacy snapshot and a snapshot without the field decodes as expanded. Back-compat, no `Snapshot` version bump.

Only a genuine user toggle persists. The sidebar seeds expansion from the model on launch (`seedExpansionFromModel`) and writes back via the per-workspace `AppStore.setWorkspaceExpanded` from the row-toggle callbacks. A `suppressExpansionPersist` flag guards all programmatic expansion — the launch/rebuild re-apply, the active-session reveal, the focus zoom-in — so revealing or focusing a collapsed workspace shows it without un-collapsing it on disk. `expandAll`/`collapseOthers` persist the whole tree via `setWorkspacesExpanded`, and `collapseOthers` targets all workspaces so it works while a focus filter is active. A runtime-added workspace defaults expanded.

Covered by host-free round-trip/back-compat/mutator tests and SidebarUITests relaunch, reveal-does-not-repersist, focused-collapse, and runtime-add-render cases.

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