Parity follow-ups: HeaderBar, filter/entitlement tests, docs sync

[cestercian]

Summary

• Port HeaderBar (last missing design component from the checklist)
• Cover CodeRabbit nits: MessagesFilter visibleThreads + Checkout entitlement gate
• Sync CLAUDE / PARITY_CHECKLIST / FEATURE_CHECKLIST now that PR Parity polish: BookingDetail CTAs, Artist Home, Messages filters, MonthDayGrid #45 is on main

Test plan

• ./gradlew :app:compileDevDebugKotlin :app:testDevDebugUnitTest green
• Spot-check HeaderBar in ComponentGallery preview

  

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[greptile-apps]

Greptile Summary

Adds the remaining HeaderBar design component and gallery example, improves entitlement and message-filter test coverage, and synchronizes parity documentation.

• Introduces a themed Compose HeaderBar with optional subtitle and action slots.
• Makes EntitlementStore minimally extensible for checkout entitlement-gate testing.
• Adds tests for checkout paywall gating and message-thread filtering.
• Updates feature and parity checklists to reflect previously shipped work.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete changed-code defects identified.

The new component is currently isolated to the gallery, the entitlement changes preserve production defaults and behavior, and the remaining changes add focused tests or synchronize documentation.

Important Files Changed

Filename	Overview
app/src/main/java/in/artistant/app/designsystem/component/HeaderBar.kt	Adds a self-contained themed header component with optional leading, trailing, and subtitle content.
app/src/main/java/in/artistant/app/designsystem/component/ComponentGallery.kt	Adds HeaderBar to the component gallery without affecting production navigation.
app/src/main/java/in/artistant/app/feature/paywall/EntitlementStore.kt	Opens the class and subscription feature getter to support a focused test override while preserving production behavior.
app/src/test/java/in/artistant/app/feature/booking/CheckoutViewModelLogicTest.kt	Verifies that enabled subscriptions without entitlement route checkout to the paywall without creating a booking.
app/src/test/java/in/artistant/app/feature/messages/MessagesFilterLogicTest.kt	Verifies that message threads are partitioned correctly across all, booking, and inquiry filters.

_{Reviews (1): Last reviewed commit: "chore(parity): HeaderBar, CR test nits, ..." | Re-trigger Greptile}