feat: fold legacy models into separate menus

[t3dotgg]

Older provider models crowd the model picker and make the current families harder to scan.

This marks legacy models in provider snapshots so every client receives the same classification. Web and desktop now place them in an inline collapsed section, while mobile places a provider-scoped legacy submenu immediately after each provider. Search, favorites, existing selections, and custom models remain directly usable.

Screenshots

Before

After, collapsed

After, expanded

Verification

• vp test run packages/contracts/src/server.test.ts apps/server/src/provider/Layers/CodexProvider.test.ts apps/server/src/provider/Layers/ClaudeCapabilitiesProbe.test.ts apps/web/src/modelSelection.test.ts apps/mobile/src/lib/modelOptions.test.ts
• Scoped typechecks for contracts, server, web, and mobile
• Touched-file lint
• Real web client pass for collapse, expand, search, selection, and legacy-selection reopen behavior

Created by gpt-5.6-sol using the Codex harness in T3 Code.

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Note

Medium Risk
Touches shared contracts and model-picker combobox key format; behavior is user-visible across web and mobile but scoped to picker UX with tests for classification and key round-trips.

Overview
Adds an optional isLegacy flag on provider model snapshots (contracts schema, Claude/Codex classification) so clients can tuck older models out of the main list while keeping search, favorites, and existing selections working.

Mobile centralizes model menu building in buildModelMenuActions, splitting current vs legacy models into per-provider submenus (including a dedicated “legacy models” group when only legacy models exist).

Web adds a collapsible Legacy models row per provider instance in ModelPickerContent, auto-expands when the active model is legacy, and switches combobox keys to modelPickerKeys so model rows and legacy section toggles cannot collide (replacing naive instanceId:slug parsing).

^{Reviewed by Cursor Bugbot for commit a6ccc74. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fold legacy models into collapsible sections in the model picker UI

• Adds an isLegacy flag to ServerProviderModel in server.ts, propagated from Claude and Codex providers through to AppModelOption and ModelOption on web and mobile.
• On web, ModelPickerContent.tsx groups legacy models under a collapsible "Legacy models" section per provider instance, with collision-safe item keys via the new modelPickerKeys.ts module.
• On mobile, a new buildModelMenuActions utility in modelOptions.ts separates legacy models into a provider-scoped submenu; providers whose only models are legacy may be omitted.
• Behavioral Change: model picker keyboard navigation and onValueChange handlers now parse the new prefixed key format; existing stored keys would not match the new scheme.

^{Macroscope summarized a6ccc74.}

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces a new feature that changes how models are presented to users across web and mobile platforms, adding collapsible legacy model sections with new state management. New user-facing features warrant human review even when well-tested.

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