a11y: make 'Select a language' hint action keyboard-focusable (#132085)

[Mahiv Ram(maram) (maram-odoo)]

Summary

• Makes the [[Select a language]] and [[Generate code]] hint actions in empty/untitled editor hints keyboard-accessible by adding tabIndex=0, role="button", and Enter/Space keydown handling.
• Also sets data-content-index on action anchors in renderFormattedText so consumers can identify which action a keyboard event targeted.

Fixes #132085

Test plan

• Open a new untitled file in VS Code
• Tab until focus lands on the "Select a language" hint action
• Press Enter or Space — the language picker should open
• Tab again — focus should move to the next hint action or out of the hint

🤖 Generated with Claude Code

[Copilot]

🟡 Changes recommended

Keyboard activation passes an incompatible event, and existing renderer tests will fail.

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Pull request overview

Makes empty-editor hint actions keyboard accessible and exposes action indices for event targeting.

Changes:

• Adds focus, button semantics, and Enter/Space handling.
• Adds action-index metadata to formatted-text anchors.

File summaries

File	Description
emptyTextEditorHint.ts	Adds keyboard interaction to hint actions.
formattedTextRenderer.ts	Adds action-index metadata to rendered anchors.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 2
• Review effort level: Balanced

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