fix/feat: misc app fixes, cancel flow, permissions, sync & firmware

[mdmohsin7]

Summary

• Permissions interstitial on Android: On fresh install, users signing in through OnboardingWrapper were routed directly to HomePageWrapper, bypassing the permissions gate. Now checks permissions before routing.
• NotifyOnKill service: The notificationsEnabled SharedPreferences flag was only set during onboarding, so users who granted notification permission via Settings > Permissions never had the notifyOnKill service registered. Now checks actual system permission state.
• Auto sync page: Added swipe-to-delete on individual WAL items and a "Manage Storage" bottom sheet (clear synced/pending/all) to match the offline sync page.
• Developer settings build fix: _buildManualFirmwareFlash expected a DeviceProvider but was passed DeveloperModeProvider. Now reads DeviceProvider from context.
• Subscription cancel flow: 3-step full-screen cancellation flow (reason → dynamic feedback → consequences) replacing the old confirmation dialog. Stores reason in Firestore and Mixpanel. Full funnel tracking (started/reason/confirmed/kept/abandoned).
• Manual firmware flash fix: startLegacyDfu was ignoring the user-picked zip file path, always looking at the app documents directory. Now passes zipFilePath through to both legacy and MCU DFU paths.

Test plan

• Fresh install on Android → sign in → verify permissions interstitial shows
• Enable notifications via Settings > Permissions → kill app → verify "Omi disconnected" notification appears
• Auto sync page → verify swipe-to-delete and "Manage Storage" button work
• Developer settings with device connected → verify no build errors
• Cancel subscription → verify 3-step flow with dynamic feedback titles
• Cancel subscription → verify reason stored in Firestore and Mixpanel
• Manual firmware flash → pick ZIP → verify flash starts without "firmware not found" error

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR delivers six targeted bug fixes: Android permissions gate on sign-in, NotifyOnKill service registration, auto-sync WAL management UI, developer settings build error, subscription cancellation flow (replaced with a new 3-step full-screen flow with Mixpanel/Firestore tracking), and manual firmware flash ignoring user-picked ZIP files.

Key changes:

• onboarding/wrapper.dart: Adds _routeWithPermissionsCheck to check actual permission state before routing to HomePageWrapper; second call site in the onSignIn callback is missing await (the callback is not async)
• cancel_subscription_sheet.dart (new): 3-step full-screen cancellation flow; PopScope(canPop: !_isCancelling) causes the system back button to close the entire flow from pages 1 and 2 rather than navigating back a step — the onPopInvokedWithResult guard condition can never fire in the scenario it is meant to handle
• firmware_mixin.dart: zipFilePath now forwarded to startLegacyDfu; manual flash page hard-coded to MCU DFU
• home/page.dart: Live Permission.notification.isGranted check replaces potentially stale SharedPreferences flag
• developer.dart: Builder widget reads DeviceProvider from context instead of receiving the wrong DeveloperModeProvider
• Backend: Optional cancellation reason stored in Firestore and Mixpanel; reason_details: str = None type hint should be Optional[str] = None

Confidence Score: 4/5

Mostly safe to merge; one P1 UX bug in the new cancellation flow lets the system back button skip to close instead of going back a step.

A P1 logic bug in cancel_subscription_sheet.dart means PopScope(canPop: !_isCancelling) closes the entire cancellation flow when the user is on pages 1 or 2 and presses the system back button. The onPopInvokedWithResult callback is effectively dead code due to the invariant between canPop and !_isCancelling. All other fixes are correct and well-guarded.

app/lib/pages/settings/widgets/cancel_subscription_sheet.dart (PopScope canPop logic) and app/lib/pages/onboarding/wrapper.dart (unawaited async call in onSignIn).

Important Files Changed

Filename	Overview
app/lib/pages/settings/widgets/cancel_subscription_sheet.dart	New 3-step cancellation flow widget; PopScope(canPop: !_isCancelling) causes system back to close the entire flow from pages 1 and 2 instead of going back a step — P1 logic bug.
app/lib/pages/onboarding/wrapper.dart	Adds _routeWithPermissionsCheck to gate sign-in via the permissions interstitial; second call site in onSignIn callback is not awaited (callback is not async), leaving the Future unhandled.
app/lib/pages/home/firmware_mixin.dart	Passes zipFilePath through to startLegacyDfu so user-picked ZIP files are no longer ignored — straightforward and correct fix.
app/lib/pages/home/page.dart	Replaces SharedPreferences flag check with live Permission.notification.isGranted to correctly register NotifyOnKill service for users who granted permissions post-onboarding.
app/lib/pages/settings/developer.dart	Fixes _buildManualFirmwareFlash to read DeviceProvider from context via a Builder instead of receiving the wrong DeveloperModeProvider; also switches manual flash to always use MCU DFU.
backend/routers/payment.py	Adds optional CancelSubscriptionRequest body to the DELETE subscription endpoint; stores cancellation reason before proceeding — correct and clean.
backend/database/users.py	Adds set_user_cancellation_feedback to write reason+details to Firestore; reason_details: str = None should be Optional[str] = None per PEP 484.
app/lib/pages/conversations/auto_sync_page.dart	Adds swipe-to-delete on WAL items and a Manage Storage bottom sheet (clear synced/pending/all) with proper confirmation dialogs and mounted checks — well-implemented.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[User taps Cancel Subscription] --> B[CancelSubscriptionFlow.show]
    B --> C[Step 1: Pick Reason]
    C -->|Reason selected + Continue| D[MixpanelManager subscriptionCancelReasonSelected]
    D --> E[Step 2: Feedback]
    E -->|Continue or Skip| F[Step 3: Confirm]
    F -->|Keep My Plan| G[MixpanelManager subscriptionCancelKeptPlan]
    G --> H[pop false]
    F -->|Confirm and Cancel| I[_confirmCancel]
    I --> J[MixpanelManager subscriptionCancelConfirmed]
    J --> K[UsageProvider cancelUserSubscription]
    K --> L[DELETE /v1/payments/subscription with JSON body]
    L --> M[backend: store cancellation_feedback in Firestore]
    M --> N[fetchSubscription + loadAvailablePlans]
    N --> O[pop true]
    C -->|AppBar back on page 0| P[MixpanelManager subscriptionCancelAbandoned]
    P --> Q[pop false]
    C -->|System back P1 bug| R[Entire flow closes immediately - pages 1 and 2 also affected]

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