feat: implement accessibility audits for trade modal and search results

[soomtochukwu]

Summary

• Trade Modal (Add tab-key navigation order audit for trade modal fields #268): Audited and adjusted the tab-key navigation order. Moved the Close (X) button to the beginning of the DialogContent DOM to ensure a visually logical tab sequence (Close -> Amount -> Cancel -> Confirm). Updated the TradeDialog focus order tests to reflect this change.
• Search Results (Add aria-live region for creator search result count #269): Added a visually hidden ariaclos-live="polite" region to StickyFilterBar to announce search result counts to screen reader users. The announcement is debounced by 500ms to avoid excessive noise during active typing, while the visual count remains instantaneous.

Closes #268
Closes #269

Testing

• pnpm lint
• pnpm build
• Added src/components/common/tests/StickyFilterBar.test.tsx to verify debounced aria-live announcements.
• Updated src/components/common/tests/TradeDialog.focusOrder.test.tsx to verify DOM focus order.

Checklist

• Linked issue or backlog item
• Scope is limited to the stated change
• Updated docs if behavior or setup changed
• Added screenshots for UI changes when relevant

Summary

Testing

• pnpm lint
• pnpm build

Checklist

• Linked issue or backlog item
• Scope is limited to the stated change
• Updated docs if behavior or setup changed
• Added screenshots for UI changes when relevant

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