feat(tui): add onClick handler to InlineTool and Task components

[thdxr]

Summary

• Add onClick prop to InlineTool component with hover state management
• Implement subtle hover effect by changing text color instead of background
• Add onClick handler to Task component to navigate to child session
• Prevent click when text is selected to avoid accidental navigation

Changes

• Added onClick?: () => void prop to InlineTool
• Added hover state with createSignal and mouse event handlers
• Modified fg memo to change text color on hover when clickable
• Added onClick to Task that navigates to props.metadata.sessionId if available
• Added selection check before triggering onClick to prevent accidental clicks

Testing

• Typecheck passes
• Hover effect works correctly (text color change)
• Clicking on Task navigates to child session
• Clicking with text selected does not trigger navigation