🎨 Palette: Add CTA to Analytics Debug Empty State

[ford442]

💡 What: Added a clear Call-To-Action (CTA) button ("Send Test Event") to the empty state of the Analytics Debug panel. Clicking the button logs a test event to populate the view.

🎯 Why: As noted in Palette's journal, "Empty states without a clear next action lead to user confusion." The previous "No events yet..." message left users stranded with an empty screen and no obvious way to generate data. The new CTA makes the debug panel immediately interactive.

📸 Before/After: (See Playwright Verification Videos)
Before: A static gray text block saying "No events yet..."
After: The text accompanied by a styled .analytics-debug-button that users can click to trigger trackEvent('test_event').

♿ Accessibility:

• The new CTA uses a native <button> element ensuring keyboard focusability.
• The decorative bell emoji is correctly marked with aria-hidden="true" to prevent screen reader noise.
• The button uses existing .analytics-debug-button classes, ensuring consistent contrast and focus-visible states.

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PR created automatically by Jules for task 1845681138009878317 started by @ford442

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