Wire set-default and add-widget switches in quick setup in the brand design onboarding

[catalinradoiu]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1211724162604201/task/1214706069730418?focus=true

Description

Wires up the "Set DuckDuckGo as default" and "Add home screen widget" switches in the reinstaller quick-setup screen, and persists the user's quick-setup selections on "Start Browsing".

Default browser switch

• First tap on the screen launches the system role-manager dialog. Subsequent taps (and toggling off) open the system default-apps settings.
• Switch state syncs with the actual default-browser status on resume and on activity result, so the UI never drifts from reality.
• onActivityResult uses a distinct request code for the quick-setup flow so the legacy comparison-chart handlers aren't reused.

Add widget switch

• Toggling on launches the system pin-widget prompt.
• Toggling off opens a new "How to remove the home screen widget" bottom sheet with instructions; switch state syncs on resume via widgetCapabilities.hasInstalledWidgets.

Row visibility

• Both rows are hidden when entering the quick-setup screen if DDG is already the default browser / a DDG widget is already installed. Computed once at entry (not on resume), so the screen layout doesn't shuffle while the user is on it.
• Visibility is applied before ChangeBounds/measure so the dialog animates to the correct final size.

Start Browsing persistence

• Tapping the primary CTA now persists the user's selections from the address-bar-position and search-options bottom sheets: settingsDataStore.omnibarType, duckChat.setCosmeticInputScreenUserSetting, onboardingStore.storeInputScreenSelection.

Telemetry

• Pixels and wide events from the quick-setup path are intentionally suppressed for now (fireTelemetry = false). Quick-setup-specific pixels will land in a follow-up branch.

Steps to test this PR

Setup

• Setup JSON patch to get enrolled in the experiment. Create local-config-patches folder inside privacy config internal. Create this quick-setup-patch.json in that folder and add:
  [ { "op": "add", "path": "/features/onboardingQuickSetup", "value": { "state": "enabled", "features": { "onboardingQuickSetupExperimentMay26": { "state": "enabled", "cohorts": [ { "name": "control", "weight": 0 }, { "name": "treatment", "weight": 1 } ] } } } } ]
• Create local.properties in privacy config internal and add this line there config_patches=privacy-config/privacy-config-internal/local-config-patches/quick-setup-patch.json
• Reinstall the app and launch onboarding as a reinstall user and click "I've been here before"

Default browser switch

• Reach the quick-setup screen (reinstall user + treatment cohort).
• Tap the default-browser switch; the system role-manager dialog appears.
• Accept; the switch stays on. Re-tap; system default-apps settings opens.
• Toggle the switch off; system default-apps settings opens. Unset DDG → return; switch is off. Don't change → return; switch reverts to on.

Add widget switch

• Tap the add-widget switch; the system pin-widget prompt appears.
• Accept; the switch stays on (widget appears on home screen).
• Toggle the switch off; the "How to remove the home screen widget" bottom sheet appears.
• Dismiss with Done / X / back / swipe and verify the switch reverts to on (widget is still installed).
• Background the app, remove the widget from the home screen, return; switch is off.

Row visibility

• Make DDG default before entering the screen → the default-browser row is hidden when QUICK_SETUP loads.
• Add a DDG widget before entering the screen → the add-widget row is hidden when QUICK_SETUP loads.
• Verify the dialog measures/animates to the correct height with rows hidden (no flash of full layout).

Start Browsing persistence

• Pick a non-default address-bar position and search-options selection via the edit bottom sheets.
• Tap Start Browsing.
• Reopen the app; verify settingsDataStore.omnibarType reflects the selection and the input-screen setting is applied.

UI changes

Check parent task

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Note

Medium Risk
Touches reinstall onboarding UX, default-browser prompts, widget pinning, and settings persistence; survey gating is a small behavioral change with clear tests.

Overview
This PR completes the reinstaller quick-setup flow in brand-design onboarding: default-browser and home-screen widget switches are wired to system UI, switch state stays aligned with reality, and Start Browsing saves address-bar and search/AI choices.

Quick setup behavior: Toggling default browser shows the role-manager dialog once, then opens system default-app settings; a separate activity result code avoids mixing with the comparison-chart flow. The widget switch launches the pin prompt when on, and a new remove-widget instructions bottom sheet when off; QuickSetupSwitchRow.setCheckedSilently prevents feedback loops when syncing. On resume, switches reflect DefaultBrowserDetector and WidgetCapabilities; rows for default browser / widget are hidden at QUICK_SETUP entry if already satisfied so layout does not jump during ChangeBounds. Start Browsing applies omnibar type and input-screen settings via shared helpers (telemetry suppressed on this path for a follow-up).

Other: Default-browser-changed survey modal evaluation skips until onboarding is complete. Onboarding theming adds quickSetupStepNumberText; bottom sheets get padding/surface tweaks and new copy/assets for remove-widget steps. ViewModel tests cover the new commands and persistence.

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[catalinradoiu]

• Add pixel events for Quick Setup onboarding screen #8672
• Wire set-default and add-widget switches in quick setup in the brand design onboarding  #8626 👈 (View in Graphite)
• Add the bottom sheets for selecting address bar position and options in the quick setup onboarding page  #8578
• develop

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