feat: add CLI command /model-delete + add prevention

[madebyaris]

Remove the model by using /model-delete from custom, and also we add delete preventation if it's active

[Copilot]

Pull request overview

This PR adds a new /model-delete CLI command that allows users to remove custom saved models, with built-in safeguards to prevent deletion of active models and Kolosal Cloud models.

• Implements /model-delete command with validation to prevent deletion of active or Kolosal-managed models
• Adds interactive confirmation dialog for model deletion
• Integrates delete functionality into the existing model selection dialog via 'd' key

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
packages/cli/src/ui/hooks/slashCommandProcessor.ts	Adds handler for new model_delete dialog action
packages/cli/src/ui/components/ModelSelectionDialog.tsx	Adds delete functionality via 'd' key and tracks selected model index
packages/cli/src/ui/components/ModelDeleteConfirmationDialog.tsx	New confirmation dialog component for model deletion
packages/cli/src/ui/commands/types.ts	Adds model_delete dialog type
packages/cli/src/ui/commands/modelDeleteCommand.ts	Implements the core /model-delete command logic with validation
packages/cli/src/ui/commands/modelDeleteCommand.test.ts	Test coverage for the model delete command
packages/cli/src/ui/App.tsx	Integrates delete dialog and handlers into main app
packages/cli/src/test-utils/mockCommandContext.ts	Adds missing sessionId field to mock context
packages/cli/src/services/BuiltinCommandLoader.ts	Registers the new model delete command
packages/cli/src/config/savedModels.ts	Adds removeSavedModelEntry utility function
packages/cli/src/config/savedModels.test.ts	Test coverage for removeSavedModelEntry function
kolosal-server	Subproject commit update

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[Copilot]

The handleModelDeleteOpen function opens the model selection dialog, but this conflicts with the normal model selection flow. When a user invokes /model-delete, they should see only deletable models, but this opens the same dialog used for model switching. This will confuse users as the dialog doesn't filter to show only deletable models in the delete context.

Suggested change

	// Open model selection dialog filtered to deletable models
	setIsModelSelectionDialogOpen(true);
	// Open model delete dialog, which will show only deletable models
	setIsModelDeleteDialogOpen(true);

[Copilot]

The model selection dialog is being reused for two different purposes (selection and deletion) without a clear way to distinguish the context. Consider passing a mode parameter or using a separate state variable to indicate whether the dialog is in 'select' or 'delete' mode, which would allow for different filtering and UI behavior.

[Copilot]

The removeSavedModelEntry function is defined but never used in the codebase. The deletion logic in App.tsx (lines 2241-2253) manually filters the array instead of calling this utility function, resulting in code duplication and inconsistency.

[Copilot]

[nitpick] The delete key handler silently does nothing when a model is not a saved custom model. Consider providing user feedback (e.g., a brief error message) when 'd' is pressed on a non-deletable model to avoid confusion about why the action didn't trigger.