DonationReminderV3: end-of-experiment screens

[cooltey]

Phabricator:
https://phabricator.wikimedia.org/T435550

[Copilot]

Pull request overview

Adds end-of-experiment experiences for Donation Reminder V3.

Changes:

• Adds wrap-up cards and feedback survey UI.
• Adds a monthly donation path with recurring Google Pay preselection.
• Adds wrap-up scheduling, persistence, and developer controls.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
app/src/main/res/xml/developer_preferences.xml	Adds the developer wrap-up toggle.
app/src/main/res/values/preference_keys.xml	Defines the toggle’s preference key.
app/src/main/res/layout/view_donation_reminder_card.xml	Adds wrap-up labeling and learn-more UI.
app/src/main/res/drawable/ic_open_in_new_black_16px.xml	Adds the external-link icon.
app/src/main/java/org/wikipedia/views/SurveyDialog.kt	Adds the wrap-up feedback survey.
app/src/main/java/org/wikipedia/settings/Prefs.kt	Persists the developer override.
app/src/main/java/org/wikipedia/settings/dev/DeveloperSettingsPreferenceLoader.kt	Handles wrap-up developer controls.
app/src/main/java/org/wikipedia/page/leadimages/PageHeaderView.kt	Displays the appropriate reminder variant.
app/src/main/java/org/wikipedia/page/leadimages/LeadImagesHandler.kt	Routes wrap-up actions to survey or donation.
app/src/main/java/org/wikipedia/donate/donationreminder/DonationReminderHelper.kt	Adds wrap-up dates and state handling.
app/src/main/java/org/wikipedia/donate/donationreminder/DonationReminderCardView.kt	Supports wrap-up content and external navigation.
app/src/main/java/org/wikipedia/donate/DonateDialog.kt	Adds the monthly donation presentation.
app/src/extra/java/org/wikipedia/donate/GooglePayViewModel.kt	Reads the recurring-donation default.
app/src/extra/java/org/wikipedia/donate/GooglePayComponent.kt	Propagates recurring-donation intent state.
app/src/extra/java/org/wikipedia/donate/GooglePayActivity.kt	Preselects recurring donations.

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