Add custom AI onboarding flow

[LukasPaczos]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1208671518894266/task/1215636599294592?focus=true
Tech Design URL (if applicable): https://app.asana.com/1/137249556945/project/481882893211075/task/1215717267206369?focus=true

Description

Integrates the custom-AI variant of new-user onboarding on top of the LinearOnboardingOrchestrator.

• Adds buildCustomAiPlan: intro (with Duck.ai animation) → notifications → welcome → AI comparison chart → chat-only input preview → in-browser Duck.ai demo → comparison chart → set-default → address bar.
• Adds a BrowserActivity-hosted onboarding step (NewUserBrowserActivityStep + NewUserBrowserOnboardingViewModel) so the orchestrator can hand off OnboardingActivity ⇄ BrowserActivity for the live Duck.ai demo and return.
• Extracts DuckAiOnboardingDemo to arm the demo (mark the flow + silence the standard DAX CTAs) identically from the legacy onboarding-done path and the new step.
• Derives the step-indicator "N of M" from each step's position in the plan (showsStepIndicator), and enables custom-AI copy variants for the relevant dialogs. The default flow retains 3 indicated steps while the custom-AI flow has 4.
• Always finishes the custom AI flow on an open Duck.ai input tab.

Compatibility notes:

1. isCustomAiOnboardingFlow() is still a stub (returns false) — the flow is dark until it is wired to a real flag.
2. The flow currently only works with native input disabled and weaves in some old-design onboarding CTAs, both will be resolved in a dependent project.

Steps to test this PR

Apply below diff:

diff --git a/app/src/main/java/com/duckduckgo/app/cta/ui/CtaViewModel.kt b/app/src/main/java/com/duckduckgo/app/cta/ui/CtaViewModel.kt
index d9cf899bad..e941d7e28f 100644
--- a/app/src/main/java/com/duckduckgo/app/cta/ui/CtaViewModel.kt
+++ b/app/src/main/java/com/duckduckgo/app/cta/ui/CtaViewModel.kt
@@ -131,7 +131,7 @@ class CtaViewModel @Inject constructor(
     }
 
     private suspend fun isSubscriptionCtaAvailable(): Boolean =
-        subscriptions.isEligible() && hasNoSubscription() && extendedOnboardingFeatureToggles.privacyProCta().isEnabled()
+        true // subscriptions.isEligible() && hasNoSubscription() && extendedOnboardingFeatureToggles.privacyProCta().isEnabled()
 
     private suspend fun isBrandDesignUpdateEnabled(): Boolean = withContext(dispatchers.io()) {
         onboardingBrandDesignUpdateToggles.brandDesignUpdate().isEnabled()
diff --git a/app/src/main/java/com/duckduckgo/app/onboarding/store/OnboardingStoreImpl.kt b/app/src/main/java/com/duckduckgo/app/onboarding/store/OnboardingStoreImpl.kt
index 19f4e74c11..ad958e68ce 100644
--- a/app/src/main/java/com/duckduckgo/app/onboarding/store/OnboardingStoreImpl.kt
+++ b/app/src/main/java/com/duckduckgo/app/onboarding/store/OnboardingStoreImpl.kt
@@ -222,7 +222,7 @@ class OnboardingStoreImpl @Inject constructor(
     }
 
     override fun isCustomAiOnboardingFlow(): Boolean {
-        return false
+        return true
     }
 
     companion object {
diff --git a/duckchat/duckchat-impl/src/main/java/com/duckduckgo/duckchat/impl/feature/DuckChatFeature.kt b/duckchat/duckchat-impl/src/main/java/com/duckduckgo/duckchat/impl/feature/DuckChatFeature.kt
index 356b512149..f0df1e15b5 100644
--- a/duckchat/duckchat-impl/src/main/java/com/duckduckgo/duckchat/impl/feature/DuckChatFeature.kt
+++ b/duckchat/duckchat-impl/src/main/java/com/duckduckgo/duckchat/impl/feature/DuckChatFeature.kt
@@ -141,7 +141,8 @@ interface DuckChatFeature {
     /**
      * @return `true` when the Native Input Field should be used instead of the web-based input.
      */
-    @Toggle.DefaultValue(DefaultFeatureValue.INTERNAL)
+    // @Toggle.DefaultValue(DefaultFeatureValue.INTERNAL)
+    @Toggle.DefaultValue(DefaultFeatureValue.FALSE)
     fun nativeInputField(): Toggle
 
     /**

Base flow

• Uninstall the app (just clearing storage is not enough)
• Install and open the app
• Go through the flow and ensure we're hitting all the screens from the designs
• Verify the flow finishes on an open chat tab

Skip flow

• Uninstall the app (just clearing storage is not enough)
• Install and open the app
• Click "I've been here before" and "Start AI Chat"
• Verify the flow finishes on an open chat tab

Additional checks

• Try rotating the screen at any point in the flow and verify there are no crashes or mangled transitions, especially when going across Onboarding <-> Browser Activity boundaries
• Try minimizing the app at any step of the flow, on resume it shouldn't progress automatically
• Try killing the app at any step of the flow, reopening the app should restart the flow from scratch and all the steps should still be navigable

UI changes

Screen_recording_20260612_195956.mp4

---

Note

Medium Risk
Large, user-visible onboarding changes with Activity handoffs and input-mode behavior, but the custom path stays off until isCustomAiOnboardingFlow() is wired beyond the current stub.

Overview
When isCustomAiOnboardingFlow() is true, buildRootPlan selects a custom AI plan (Duck.ai intro, AI comparison chart, chat-only input preview, in-browser duck_ai_demo, then browser comparison/default/address steps) instead of the default sequence. Sync restore is skipped on that path, and plan completion/skip dismisses the Duck.ai fire CTA and arms a one-shot signal so the next auto-launched input opens on the Duck.ai (chat) tab via initialInputMode / LaunchInputScreen.launchOnChat.

BrowserActivity now participates in onboarding through NewUserBrowserOnboardingViewModel: it hands off to OnboardingActivity, opens Duck.ai for the demo, and reports DuckAiFireCompleted after the onboarding fire flow. Duck.ai launch logic is centralized in launchDuckAi. DuckAiOnboardingDemo.arm() replaces duplicated “set flow + dismiss DAX CTAs” logic for both legacy onboarding-done and the orchestrator demo step. Custom AI defers early dismissal of the Duck.ai fire onboarding CTA until the orchestrator finishes (kill/resume safety).

The welcome UI gains plan-derived step indicators (showsStepIndicator), custom-AI copy, chat-only preview (toggle hidden), and fresh-entry handling when returning from BrowserActivity (comparison chart fade-in vs morph). CustomDuckAiOnboardingFeature.introAnimation() is removed in favor of plan-driven intro. OnboardingStoreImpl moves to SharedPreferencesProvider. CtaViewModel completes DAX stage when the root linear plan completes.

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[lmac012]

For some reason, in the "skip flow" scenario, I always end up on a search tab (instead of a chat tab). Everything else worked as expected 👍

[LukasPaczos]

"skip flow" scenario, I always end up on a search tab

I pushed minor tweaks to fix that yesterday, should've been on the version you tested. Either way, let's follow up separately if needed.

Screen_recording_20260618_103435.mp4