🎨 Palette: Search View Screen Reader Support

[AhmmedSamier]

💡 What: Added the ARIA Combobox pattern to the custom Webview search interface. This applies role="combobox", aria-expanded, and aria-activedescendant to the search input, role="listbox" to the results container, and role="option" with dynamic IDs and aria-selected to individual results.
🎯 Why: Previously, using keyboard arrow keys to navigate the list of .result-item divs would visually highlight them, but screen readers remained completely silent because focus never actually moved from the search input to the elements. The ARIA Combobox pattern solves this by keeping focus on the input while programmatically informing the screen reader which option is actively "selected".
📸 Before/After: Visual appearance remains exactly the same, but structural ARIA attributes have been fundamentally upgraded for a11y. (See Playwright verification).
♿ Accessibility: Ensures full screen reader support during keyboard navigation of search results and slash commands.

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PR created automatically by Jules for task 1257618980764988157 started by @AhmmedSamier

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📥 Commits

Reviewing files that changed from the base of the PR and between 35dd4d7 and 0b3b088.

📒 Files selected for processing (3)

• .jules/palette.md
• vscode-extension/src/test/suite/reference-code-lens.test.ts
• vscode-extension/src/webviews/search-view.html

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch palette-aria-combobox-1257618980764988157

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