The screen was built entirely from raw android.widget.* views with no
theme applied at all, so it never had a chance to follow system dark/light
mode and looked dated regardless. Adds AppCompat + Material Components,
switches SettingsActivity to AppCompatActivity with a Theme.Material3.
DayNight theme, and rebuilds the screen with Material widgets (cards,
chips for the hidden-packages list, proper text fields).
Also adds a launcher icon (previously none): a vector adaptive icon, a
moon-like disc partially eclipsed by a diagonal veil in the background
color — no image tool involved, just XML.
Also renames the per-app "Remove" button to "Apply defaults (hide
everything)" — "Remove" read as removing the app from the list, not
resetting it to defaults, which is all it actually does.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude Sonnet 5
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