* Clear sidebar notification when user submits prompt in Claude Code
Add UserPromptSubmit hook to the Claude Code wrapper that calls
`cmux claude-hook prompt-submit`. This clears the workspace notification
and sets status back to "Running" when the user addresses Claude's question,
so the "waiting for input" preview in the sidebar goes away.
Also adds --tab support to clear_notifications socket command and
--workspace support to the clear-notifications CLI command for
per-workspace notification clearing.
Closes https://github.com/manaflow-ai/cmux/issues/799
* Address review feedback: stricter error handling
- clear-notifications CLI: error on explicit --workspace failure instead of
falling back to global clear. Env var still gracefully degrades.
- prompt-submit hook: propagate sendV1Command errors instead of swallowing
with try?.
- clear_notifications socket: validate --tab flag is present before resolving,
reject malformed args instead of falling back to selected tab.
* Gate env workspace fallback on windowId == nil in clear-notifications
Matches the pattern used by other CLI commands to avoid using
CMUX_WORKSPACE_ID from the caller shell when --window targets
a different window.
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