Fix AI combobox aria-activedescendant

[Ovgodd]

Summary

Fixes AI suggestion menu accessibility by wiring aria-activedescendant to the active option so screen readers announce the current item during keyboard navigation.

issue : #2412

Rationale

The combobox/listbox pattern keeps focus on the input, so the active option must be exposed via aria-activedescendant. Without it, NVDA/VoiceOver announce “empty” and provide no feedback. This change aligns with WAI-ARIA Authoring Practices

Changes

• Track the active suggestion index in PromptSuggestionMenu and set aria-activedescendant on the input.
• Extend Generic.Form.TextInput props to accept aria-activedescendant.

Impact

• Improves screen reader output for the AI suggestion menu.
• No visual or behavioral changes for sighted users; focus remains on the input.

Testing

• Manual: verified arrow-key navigation announces the active option in NVDA/VoiceOver.
• Automated: not added (no existing tests for this component).

Screenshots/Video

Sr announce now :

Ask AI Write with AI  1 sur 1
liste
Continue Writing  1 sur 4
Summarize  2 sur 4
Add Action Items  3 sur 4
Write Anything…  4 sur 4

N/A (accessibility change).

Checklist

• Code follows the project's coding standards.

Additional Notes

This fix targets only the AI suggestion menu combobox. Future work could add aria-expanded / aria-controls for full parity with the ARIA combobox pattern.

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commit: 84d7b45