feat(ui): add robot action panel for operators

[05F3759DF]

Context

Once Keystone has robot action catalogs and action request APIs, operators need a UI workflow to run pre-registered robot-side actions without typing commands or manually crafting API payloads.

Scope

• Add an action panel to the robot detail or operations view.
• Show available actions from the robot's current action catalog.
• Render argument inputs from the action schema.
• Require confirmation or approval flow for high-risk actions.
• Show recent execution status, result summaries, and failure reasons.
• Disable or clearly mark actions when the robot catalog is stale, the agent is offline, or the user lacks permission.

Acceptance Criteria

• Operators can select a robot action and submit valid arguments through the UI.
• Invalid arguments are blocked before submission where possible.
• High-risk actions require confirmation or approval according to the action definition.
• Recent action runs show status and sanitized result summaries.
• UI handles stale catalogs, offline robots, permission denial, and request creation failures.

Depends On

• feat(ops): add robot action catalog model and API #65
• feat(ops): create action request API with audit trail #66
• feat(ops): expose action execution status and logs #67