fix: Set keyboard focus on dialogs for accessibility (MAS 2.4.7)

[claude]

Summary

• Set keyboard focus to "View in OneNote" button when Clip successful dialog appears
• Set keyboard focus to "Back to Home" button when Region instructions dialog appears
• Addresses MAS 2.4.7 Focus Visible requirements

Changes Made

1. Success Panel (src/scripts/clipperUI/panels/successPanel.tsx)

• Added initiallySetFocus method to programmatically set focus on an element
• Applied onElementFirstDraw(this.initiallySetFocus) to the "View in OneNote" button
• When the success dialog appears, keyboard focus is now automatically set to the "View in OneNote" button

2. Region Selecting Panel (src/scripts/clipperUI/panels/regionSelectingPanel.tsx)

• Added the same focus management pattern
• When the region instructions dialog appears, keyboard focus is now set to the "Back to Home" button

Technical Approach

The fix follows the existing pattern used in SignInPanel.tsx where onElementFirstDraw (defined in ComponentBase.ts) is used to execute a callback when an element is first rendered. This ensures focus is set exactly once when the panel first appears.

Accessibility Compliance

This addresses MAS 2.4.7 – Focus Visible by ensuring keyboard users have visible focus when these dialogs are displayed.

Closes #626

🤖 Generated with Claude Code

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