Extract Feedback feature into a separate module

[landomen]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1214295689610258/task/1216232692978954?focus=true
Tech Design URL (if applicable): https://app.asana.com/1/137249556945/project/1210594645151737/task/1214800684060464?focus=true

Description

Extracts the Feedback feature from the :app module into a new :feedback module so it can be reused by several other features.

Steps to test this PR

Smoke check Feedback and entry points

• Settings → Share Feedback — tap opens the initial "How do you feel about DDG?" screen.
• Browser overflow / prompted LaunchFeedbackView — whichever surface fires BrowserViewModel's LaunchFeedbackView command opens the feedback screen.
• DuckChat Settings → Share Feedback — opens the feedback screen.
• Duck AI Input Screen → Share Feedback action — opens the feedback screen.
• Privacy Dashboard → Report / Feedback link — opens the feedback screen.
• VPN Report Breakage flow (AppFeedbackContract) — the "report app breakage" path launches the shared feedback intent.
• Subscription "General" feedback — from Settings, "Pro" feedback entry launches SubscriptionFeedbackActivity (separate flow; verify it still launches too and is not broken by the split).
• Submitting closes the screen. When entered from Settings, a "Thanks for the feedback!" snackbar appears on the settings root.
• Submitting from a fire-and-forget entry (BrowserActivity, DuckChat, Privacy Dashboard, VPN) does not show a snackbar and does not crash.
• Opening the feedback screen fires the "feedback shown" pixel.
• Positive path fires the positive submission pixel.
• Each negative main reason fires the correct sub-reason pixel on submit.
• Broken-site submission fires the broken-site pixel with the URL.
• Cancelling fires the appropriate cancellation pixel (if one existed before the split).

UI changes

No UI changes

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Note

Medium Risk
Large modular refactor with many entry points; wrong wiring could break feedback launches or analytics, and About no longer exposes feedback where it did before.

Overview
Moves in-app Share Feedback out of :app into new :feedback-api / :feedback-impl modules and wires callers through shared navigation APIs.

Launch paths: BrowserActivity, VPN breakage (AppFeedbackContract), and similar flows now start feedback via GlobalActivityStarter and FeedbackScreenNoParams instead of FeedbackActivity in :app. Settings registers FeedbackLauncher.feedbackContract() for result-based launches and still shows the thanks snackbar; feedback copy strings move out of :app locales while thanksForTheFeedback stays in :app for that snackbar.

Removed from :app: manifest entry for FeedbackActivity, app-local FeedbackContract, NetworkModule feedback submitter wiring, and feedback submission pixel names in AppPixelName. Lint baseline drops entries for deleted feedback fragments.

About screen: share-feedback commands, activity-result flow, and unified-subscription feedback routing are removed from About (Settings still handles Share Feedback with subscription unified feedback when applicable).

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