Research: Component override system feasibility analysis

[Copilot]

Assessed feasibility of making core UI components replaceable (ModelSelect, ModelCatalog, ChatContainer, DocumentEditor, PromptEditor) to enable custom implementations without forking.

Key Findings

Existing foundations:

• Registry pattern (_registry.ts) proven across 5+ subsystems
• Hook/filter system with 50+ extension points
• Custom pane apps already demonstrate component replacement viability

Current state:

• Core components hardcoded in PageShell.vue and consumers
• No override mechanism exists

Proposed Architecture

Component override registry using existing patterns:

// Registration API
registerComponentOverride({
    id: COMPONENT_IDS.MODEL_SELECT,
    component: () => import('./CustomModelSelect.vue'),
    order: 10,
});

// Resolution with fallback
const { resolve } = useComponentOverride();
const component = resolve(COMPONENT_IDS.MODEL_SELECT, {
    fallback: ModelSelect,
});

Implementation Scope

Effort: 2-4 days (~360 LOC core + tests + docs)

Priority components:

• P0: ModelSelect, ModelCatalog (high value, low-medium complexity)
• P1: ChatContainer, DocumentEditor, PromptEditor (higher complexity)

Deliverable

Full feasibility report in component-override-report.md includes:

• Architecture design with type-safe contracts
• Props/emits interfaces for each component
• Testing strategy and migration path
• Risk assessment (Low risk - backward compatible, zero breaking changes)
• Example plugin demonstrating override

Next: Approve scope and priority, then implement registry + integration.

Original prompt

Can you look into how hard it would be to make some components replaceable? For example the model catalog, prompt catalog, doc editor, etc.. technically most stuff is done using seperated composables anyway. W just need a way to render a custom component it one exists. If not we register the default. I want you to look into how hard this would be. And find good areas of the codebase to do this to.. some stuff will not make sense but some will...bring me your findings in a markdown file called "component-overide-report.md" , once you have a good understand come back to me and we will make a plan

Custom agent used: Code Reviewer
Used for code reviews

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