refactor(playwright): Improve overlay suppression, capture reliability

[swikstrom]

What This PR Changes

Summary

• Refactored overlay/tooltip suppression to use CSS-only approach instead of DOM manipulation, preventing React state issues
• Enhanced CSS selectors to support Radix UI, React Aria, and Sonner components in addition to existing toast libraries
• Improved modal dismissal logic with better selector specificity and graceful fallbacks
• Injected overlay suppression CSS at browser context startup for earlier and more consistent suppression
• Added more statusbar element captures (terminal, status, notifications, network, agent-mode)
• Improved emoji picker interaction with search input as primary method, with fallback to category navigation
• Enhanced element waiting and timing strategies for better test reliability
• Better positioning controls for highlight labels (fixedY, connectorMidX, alignVertical)

Changes

• capture.js: Reset mouse/scroll at capture start, enhanced suppressToasts CSS selectors, simplified dismissToasts to use CSS-only suppression
• app-lab.js: Improved modal dismissal, cleaned up app deletion flow with better selectors and waits, enhanced emoji selection, added retry logic for navigation, new statusbar captures
• runner.js: Added initScript to browser context for early overlay suppression injection
• Assets: Updated screenshots for stop button and sidebar icons, added new statusbar terminal screenshot

Contribution Guidelines

• I confirm that I have read the contribution guidelines and comply with them.