Add tracker activity timeline

[kasnder]

Summary

• Adds a new ActivityTimeline screen showing a recency-sorted timeline of tracker contacts grouped by app, with per-company blocked/allowed indicators and time-bucket section headers ("Last hour", "Today", "Yesterday", "This week")
• Reachable from the main activity's overflow menu as "Tracker activity" — the main activity is unchanged
• Tapping any entry navigates to DetailsActivity for that app, so users can adjust blocking
• Also includes the completed Material 3 migration: unified edge-to-edge via EdgeToEdge.enable(), AlertDialog → MaterialAlertDialogBuilder, all remaining AppCompat/MaterialComponents XML references migrated

Design

Each timeline row shows:

• App icon + name + relative timestamp
• Up to 3 tracker companies with blocked (⛔) / allowed (✅) indicators, "+N more" overflow
• Blocked trackers sorted first so they're immediately visible

Data comes from one SQL query grouping the access table by (uid, daddr, allowed) over 7 days, with tracker resolution via TrackerList.findTracker(). Non-tracker destinations are filtered out. No schema changes.

Full design doc: docs/design-timeline-main.md

New files

File	Purpose
ActivityTimeline.java	Activity with RecyclerView, async data loading
TimelineAdapter.java	Adapter with section headers + entry rows
TimelineEntry.java	Data model: grouped tracker contacts per app
TrackerContact.java	Data model: single company contact with blocked state
activity_timeline.xml	Layout: toolbar + recyclerview + empty state
item_timeline_entry.xml	Row: app icon/name/time + tracker list
item_timeline_section.xml	Section header
docs/design-timeline-main.md	Design document

Test plan

• Open main menu, tap "Tracker activity" — timeline appears with recent tracker data
• Verify time sections display correctly (Last hour / Today / Yesterday / This week)
• Verify blocked trackers show ⛔ prefix, allowed show ✅
• Tap a timeline entry — navigates to DetailsActivity for that app
• Return from DetailsActivity — timeline refreshes with updated data
• With VPN off / no data — empty state message displays
• Verify M3 migration: dialogs have rounded corners, text appearances are M3, edge-to-edge works on all API levels

https://claude.ai/code/session_01AKoCWnAeeHrRa4KjngEiTM

[kasnder]

@nmarteybotchway this is an extremely extensive set of changes, including a major design migration. probably too much to review at once. But would still be curious to hear from you if the approach runs for you

[nmarteybotchway]

@kasnder sure, I'll have a look at it and let you know, thanks

[nmarteybotchway]

@kasnder I tested the application on both my tablet and the Android Studio Pixel 7 emulator. In both cases, the tracking statistics section on the menu page appears to be hidden beneath the app bar (see attached screenshot).

The time sections display correctly during testing, and navigation from the Tracker Activity to the timeline section works as expected. Blocked and unblocked trackers also show the correct prefixes.

However, when I click on a timeline entry, it correctly opens the detail activity for the selected app, but upon returning, it navigates back to the main page instead of the updated Tracker Activity timeline page.

Reinstalling the application with VPN off and using applications with trackers (Duolingo) leads to no entries in the Tracker Activity timeline page - once VPN is turned back on and the same app is used, trackers are detected in the Tracker Activity page.

From what I see, M3 Integration seems to be functional.

[kasnder]

thanks, @nmarteybotchway . i'll fix those changes and then create a new version