Deep directories (beyond the workspace snapshot's depth limit) relied on
a lazy-loaded override cache that was never invalidated, so agent-created
files, in-app deletes / renames / rollbacks, and external changes inside
expanded deep folders stayed invisible until the folder was reopened.
Propagate watcher `changed_paths` through the delta envelope and fire a
Meta event whenever FS activity doesn't alter the tree/git snapshots, so
the frontend can surgically invalidate affected cache entries and
re-fetch. Manual refresh (Reload from disk) clears the cache and
re-hydrates still-expanded deep dirs through the same path. Replayed
deltas after reconnect are forwarded to the same listeners.
Also split the combined workspace-state effect into tree / git / status
slices so unrelated state transitions (e.g. the 'resyncing' flip during
a refresh) no longer rebuild the entire node tree and cause a flash.
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