Add collapsible 'what's included' disclosure to onboarding template cards

[FuJacob]

Summary

Onboarding template cards (Quick / Everyday / Powerful) now have a collapsed-by-default "What's included" disclosure under the description. Expanding it lists the concrete settings each template will toggle on or off — suggestion length, fast mode, multi-line completions — so users can compare templates without trusting the marketing copy alone.

Implementation

• New pure helper Cotabby/Support/OnboardingTemplateFeatureList.swift exposes the row list per template, driven from the existing OnboardingTemplate properties so the source of truth doesn't fork.
• WelcomeTemplateStepView.TemplateCard is split: the selection Button wraps the descriptive content; the disclosure is rendered as a sibling view inside the shared rounded background so its toggle taps never double-fire selection. Each card holds its own @State so opening one doesn't expand the others.
• New tests in CotabbyTests/OnboardingTemplateFeatureListTests.swift cover all three templates.

Validation

• xcodegen generate (no drift after commit)
• xcodebuild ... build (** BUILD SUCCEEDED **)
• xcodebuild test ... -only-testing:CotabbyTests/OnboardingTemplateFeatureListTests (3 tests, 0 failures)
• swiftlint lint --quiet (exit 0)

Manual UI verification on real onboarding flow not performed in this session.

Linked issues

None.

Risk / rollout notes

• New Cotabby.xcodeproj rows reflect XcodeGen rediscovering the two new files; the XcodeGen drift check should pass.
• Disclosure animation is .easeInOut(duration: 0.18) — short enough to feel responsive, long enough to read as a deliberate expansion.
• No persisted state for expanded/collapsed — by design, every card starts collapsed each time the step is re-entered.

Greptile Summary

This PR adds a collapsed-by-default "What's included" disclosure to each onboarding template card, and introduces enablesClipboardContext as a new per-template behavior flag (off for Quick, on for Everyday/Powerful). The enablesMultiLine flag is also flattened to always-false across all tiers, and the Quick tier's open-source model is switched to SmolLM2.

• New OnboardingTemplateFeatureList helper returns ordered feature rows per template driven from the existing properties, keeping the UI and tests in sync with a single source of truth.
• TemplateCard is restructured so the selection Button and the disclosure toggle are sibling views sharing one rounded background, preventing disclosure taps from double-firing template selection.
• ResolvedTemplatePlan and WelcomeView are updated to carry and apply enablesClipboardContext, completing the end-to-end wiring for the new flag.

Confidence Score: 4/5

Safe to merge after fixing the clip-shape omission on the card container; everything else is correct.

The disclosure animation uses .move(edge: .top) combined with an .opacity transition, but the outer VStack only has a .background modifier — not a .clipShape. On macOS, .background paints behind the content without clipping it, so the animating rows will visibly overflow the card's rounded rectangle for the entire 0.18 s animation. The rest of the PR — the new enablesClipboardContext wiring, the pure feature-list helper, the test coverage, and the Xcode project additions — is straightforward and correct.

Cotabby/UI/WelcomeTemplateStepView.swift — the body of TemplateCard needs a .clipShape modifier to contain the disclosure animation.

Important Files Changed

Filename	Overview
Cotabby/UI/WelcomeTemplateStepView.swift	TemplateCard split into selectionButton + featureDisclosure; disclosure animation uses .move(edge: .top) but the outer VStack has no .clipShape, causing rows to overflow the card's rounded rectangle during expand/collapse.
Cotabby/Support/OnboardingTemplateFeatureList.swift	New pure helper returning ordered feature rows per template; cleanly delegates to OnboardingTemplate properties, unit-testable with no side effects.
Cotabby/Models/OnboardingTemplate.swift	enablesMultiLine flattened to always-false; new enablesClipboardContext property (off for Quick, on for Everyday/Powerful); ResolvedTemplatePlan gains enablesClipboardContext field; Quick model filename changed to SmolLM2.
Cotabby/Support/OnboardingTemplateRecommender.swift	Minimal change — passes enablesClipboardContext through to ResolvedTemplatePlan; no logic changes.
Cotabby/UI/WelcomeView.swift	applyTemplate now calls setClipboardContextEnabled to persist the new setting; straightforward integration of the new plan field.
CotabbyTests/OnboardingTemplateFeatureListTests.swift	New tests for all three templates; correctly derives displayLabel from the property rather than hardcoding strings; everyday and powerful tests skip title-order assertions (covered by the quick test).
CotabbyTests/OnboardingTemplateRecommenderTests.swift	Updated to assert enablesClipboardContext on all tiers; enablesMultiLine assertion for Powerful flipped to false; GGUF filename for Quick updated to match model change.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[WelcomeTemplateStepView] --> B[ForEach OnboardingTemplate.allCases]
    B --> C[TemplateCard]
    C --> D[selectionButton]
    C --> E[featureDisclosure]
    D -->|onTap| F[onSelect template]
    E --> G{isFeatureListExpanded}
    G -->|false| H[Show chevron toggle]
    G -->|true| I[Show feature rows]
    I --> J[OnboardingTemplateFeatureList.rows]
    F --> N[WelcomeView.applyTemplate]
    N --> S[setClipboardContextEnabled]

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