feat(web): add default model and provider settings

[binbandit]

Summary

• Adds defaultProvider and defaultModel optional fields to the AppSettings schema so users can configure the model and provider used for new threads and projects
• Wires settings into the full selection hierarchy: draft > thread > project > settings default > built-in default
• Updates project creation (Sidebar) to propagate the default model into new projects so the setting takes effect immediately for all threads within
• Adds a "Defaults" section to the Settings page with a model dropdown (provider dropdown conditionally rendered when multiple providers become available)
• Fixes the draft-thread model fallback and its useMemo dependency array to include the settings default

Design decisions

• Both fields are Schema.optional, ensuring backward compatibility with existing persisted settings (no migration needed)
• The provider dropdown is only rendered when >1 providers are marked as available in PROVIDER_OPTIONS — currently only Codex is available, so the dropdown is hidden until more providers ship
• Project creation in Sidebar.tsx uses appSettings.defaultModel ?? DEFAULT_MODEL_BY_PROVIDER.codex so that new projects inherit the user's preferred model — without this, activeProject.model would always be "gpt-5.4" and the settings default would be unreachable

UI

Test plan

• TypeScript compiles cleanly (tsc --noEmit)
• All 5 related test suites pass (83/83 tests): appSettings, model, store, session-logic, composerDraftStore
• Verify Settings page shows "Defaults" section with model dropdown
• Change default model in settings, create a new project + thread, confirm thread uses the selected default
• Verify existing projects/threads are unaffected by the new setting
• Verify /model command still works correctly to override the default per-thread
• Verify "Restore defaults" button resets both fields

🤖 Generated with Claude Code

Note

Add default provider and model settings to the web app

• Extends appSettings.ts with optional defaultProvider and defaultModel fields in the app settings schema.
• Adds a 'Defaults' section to the Settings page where users can select a default provider and model, with a 'Restore defaults' button.
• ChatView.tsx uses these settings as fallbacks when creating new threads and resolving the active model/provider.
• Sidebar.tsx uses appSettings.defaultModel as the default model when creating new projects.

^{Macroscope summarized aec0916.}

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on this repository. Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 8da3ee2f-6f73-48e7-9418-91fe3c11617b

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

📝 Coding Plan

• Generate coding plan for human review comments

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[juliusmarminge]

#1121 serves the same purpose in a more frictionless way

[binbandit]

sure, lets close this then