chore: add changeset for v3.28.15

[mrubens]

Important

Add new models, fix various bugs, update dependencies, and improve analytics and SEO in version 3.28.15.

• Models:
  • Add DeepSeek and GLM models to Chutes provider.
  • Deprecate free grok 4 fast model.
  • Remove unsupported Gemini 2.5 Flash Image Preview model.
• Fixes:
  • Reset cost limit tracking on "Reset and Continue".
  • Improve save button activation in prompts settings.
  • Fix overeager 'unsaved changes' dialog in settings.
  • Show send button when only images are selected in chat textarea.
  • Improve Claude Sonnet 4.5 compatibility.
• Analytics:
  • Add UsageStats schema and type for analytics tracking.
  • Include reasoning messages in cloud tasks.
• Security & SEO:
  • Update vite to v6.3.6 and glob to v11.0.3.
  • Add structured data to homepage for SEO.

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