[agent] fix(web): include Claude models in git text generation model picker

[alexng353]

Summary

• The "Text generation model" dropdown in Settings → Git only listed Codex models
• With Claude now a first-class provider (feat: add Claude Code adapter #179), users should be able to select Claude models for auto-generated commit messages, PR titles, and branch names
• Merges both Codex and Claude model lists (with dedup) into the picker

Fixes #1221

See also #1219 for default model/provider settings (separate concern, but related).

Changes

One file changed (apps/web/src/routes/_chat.settings.tsx):

• gitTextGenerationModelOptions now combines models from both providers instead of hardcoding "codex"

This PR was generated by AI (Claude Code). All code changes were authored by Claude Opus 4.6.

Test plan

• Open Settings → Git → Text generation model dropdown
• Verify Claude models (Opus 4.6, Sonnet 4.6, Haiku 4.5) appear alongside Codex models
• Select a Claude model, verify it persists
• Verify "Restore default" still works

Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com

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[juliusmarminge]

There is currently no text generation backend service for Claude so this will fail

[MaximIJ]

I took a pass at the backend piece raised in review and got this working end to end locally.

What was missing:

• the Git settings UI exposed Claude models, but the server only had a Codex-backed git text generation path
• the web mutation was sending model instead of textGenerationModel, so the selected Git model never reached the backend
• the settings picker also rendered duplicate Claude entries in some cases

What I changed locally:

• added a Claude-backed git text generation service for commit messages and PR content
• routed git text generation by selected model
• fixed the web payload so textGenerationModel reaches the server
• deduped the Git model picker options
• added tests for routing and settings behavior

Local checks passed:

• bun fmt
• bun lint
• bun typecheck

If helpful, I can open a replacement PR from my fork or provide a cherry-pickable commit/branch.