Extend the async-spawn treatment previously shipped for Stop/Start/Restart
to the three remaining long-running lifecycle RPCs. Each wrapper validates
params, rejects duplicate in-flight ops, flips state to the transitional
variant (Installing/Removing/Updating), then spawns the existing inner
handler on tokio. RPC returns immediately with { status, package_id }; the
spawn task owns the terminal state write.
Install and update success arms explicitly set state=Running. The scan
loop merge (merge_preserving_transitional) refuses to overwrite
transitional states, so the spawn task must write the terminal state.
Uninstall's inner handler removes the entry entirely, so no explicit
terminal write is needed there.
Dispatcher and handler now thread self as Arc<Self> / &Arc<Self> so
spawned tasks can hold their own Arc without extra field cloning.
Transient install entry uses empty icon string. Hardcoding
/assets/img/app-icons/<id>.png 404s for apps that ship .svg or .webp
assets, which produces a broken-image flicker until the scanner refreshes
with manifest data. Empty string causes the frontend's icon computed to
fall through to the curated map, which has correct extensions.
Removed the inner "already updating" guard in update.rs — the wrapper
now owns duplicate-op detection for all three operations.
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