fix(desktop): align per-model context window cards

[zcxads666]

Summary

• Fix a layout regression in the per-model context window cards.
• Constrain long model names to two lines and expose the full name via a tooltip.
• Keep the card grid responsive without horizontal overflow.
• Add focused model-picker and responsive layout tests.

Issues

Fixes #9747

Verification

• pnpm exec tsx src/__tests__/provider-model-refresh.test.ts — 28 passed
• pnpm exec tsx src/__tests__/provider-editor-model-picker.test.tsx — 55 passed
• pnpm exec tsx src/__tests__/typography-overflow-contract.test.ts — 188 passed
• pnpm test:settings-responsive — 27 passed
• git diff --check origin/main-v2...HEAD — passed
• Manual browser verification at 1471px, 1100px, and 900px viewport widths:
  • No horizontal overflow.
  • Long model names remain accessible through tooltips.
  • Context inputs and model refresh behavior work as expected.

Screenshots

Before

After

Documentation impact

Documentation-impact: none - this is a visual layout fix with no changes to user workflows, configuration, CLI behavior, or APIs.

Cache impact

Cache-impact: none - this change only affects Desktop React/CSS layout; provider-visible prompts and tool behavior are unchanged.
Cache-guard: N/A - no cache-sensitive path was changed.
System-prompt-review: N/A