Resolve model sources before replacing role aliases and support legacy
API and OAuth configurations that retain only aliased model entries.
Add regression coverage for source priority, disabled providers,
cross-role updates, and transaction rollback.
- Resolve context limits from core model definitions, aliases, and configuration
- Preserve user overrides and display context sources and fallback hints
- Refresh defaults from CPA when restoring all model settings
- Keep restore-all available without customizations and remove its icon
- Allow saving restored defaults even when values remain unchanged
- Add regression coverage for context resolution and default restoration
- add per-model context, reasoning, modality, visibility, and parallel tool settings
- persist customizations separately and apply them during catalog generation
- support restoring individual or all models to official fallback templates
- expose full fallback reasoning levels while keeping Fast available
- add localized UI, validation, documentation, and regression tests
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