fix(model): include profile models in descriptor picker

[jatmn]

Summary

Fixes descriptor-backed /model pickers so they include models configured on the active provider profile, even when the provider's descriptor catalog or discovery results do not list every manually configured model.

This addresses #1360, where a Mistral profile configured with multiple comma- or semicolon-separated models only showed devstral-latest or the current first model in /model.

Why

Provider profiles already support model-list fields such as:

devstral-latest, mistral-medium-latest

However, descriptor-backed providers use optionsOverride in the /model command. That override was built only from the route catalog or discovered models, bypassing the active profile's configured model list. Mistral made this especially visible because its static descriptor catalog currently contains only devstral-latest.

What Changed

• Added mergeActiveProfileModelOptions() to merge active profile-configured models into descriptor-backed /model options.
• Deduplicates profile models against route catalog/discovery options by model value.
• Scopes the merge so saved profile models are only included when the profile is actually applied and resolves to the same descriptor route currently shown.
• Applies the merge on initial descriptor picker load, automatic/manual descriptor refresh, and /model refresh.
• Added focused regression coverage for:
  • Mistral-style profile models being preserved when the Mistral profile is active.
  • Saved profile models not leaking into an unrelated env-selected descriptor route such as OpenRouter.

Provider Impact

Affected provider path:

• Descriptor-backed /model provider routes, including Mistral.

Expected behavior:

• Active profile models remain selectable even if static catalog/discovery omits them.
• Existing catalog/discovery entries keep their labels and metadata.
• Saved-but-inactive profile models are not shown for unrelated env-selected providers.

Validation

Ran:

bun test src/commands/model/model.test.tsx src/utils/model/routeCatalogOptions.test.ts
bun run build
git diff --check

Results:

• Focused tests passed: 8 pass / 0 fail.
• Build passed.
• Diff whitespace check passed.

Also ran:

bun run typecheck

Result:

• Failed on existing broad repo type errors unrelated to this branch, including missing module/type errors in bridge, plugin, session, and test files. This was not used as branch-specific validation.

Notes

This is intentionally a core /model descriptor/profile fix rather than a Mistral catalog-only change, because the same issue can affect any descriptor-backed provider whose catalog or discovery results do not include manually configured profile models.