[ibrahim-iqbal]

Closes #228.

The map tag card's nearby line no longer spells out the battery. "Nearby (●●●○○) · Battery medium" is now "Nearby (●●●○○)" followed by a battery icon.

What changed

• Icons: four Material Symbols vectors, exported as-is from google/material-design-icons and in the same format as history_24px.xml (viewportWidth="960", ?attr/colorControlNormal tint). I used the horizontal battery_android_* set so the icon sits on a 12sp text line. No new dependency.

  Level	Icon
  FULL	battery_android_full
  MEDIUM	battery_android_3
  LOW	battery_android_1
  VERY_LOW	battery_android_alert

• NearbyTagLabel.batteryIcon(level): picks the drawable, next to shortBatteryLabel, so the choice is covered by the JVM test.

• ui/maps/NearbyBatteryIcon.show(icon, level): sets the drawable, the content description and the visibility. A null level (Google trackers) hides the icon. It is a separate class so the layout test can drive it without MapsActivity.

• maps_tag_card.xml: adds device_nearby_battery, a 16dp ImageView tinted ?attr/colorOutline like the text next to it. device_last_update is now wrap_content instead of a weighted 0dp, so the icon follows the text rather than sitting at the far end of the row.

• MapsActivity: the nearby line always uses nearby_now_with_signal and calls NearbyBatteryIcon.show. The timestamp branch hides the icon along with the pulse.

• Strings:

  • New battery_icon_description ("Battery %1$s"), used as the icon's content description. A screen reader still hears "Battery medium". Each translation reuses the wording already in that locale's battery line.
  • nearby_now_with_battery_and_signal had no other user, so I removed it with add_strings.py --remove.
  • --check passes.

I left the Device Info screen alone. It still shows the battery word, which seemed right for a diagnostics view.

Screenshots

Before and after, in dark and light, rendered by the new test:

Tests

TagCardBatteryIconTest (new, instrumented) inflates the real card in the light and dark app themes:

• every level shows an icon with a drawable and a content description ("Battery " + the level word), with the English "Battery medium" checked literally
• every level draws visible pixels in both themes, and no two levels draw the same image
• a sighting with no battery level hides the icon
• the icon measures 16dp × 16dp, and the card is no taller than the plain "Last Updated" card
• the tint clears 3:1 against the card background:
  • light: #6F797A on #F5FAFB = 4.25:1
  • dark: #899294 on #0E1415 = 5.85:1
• it writes the screenshots above

Other test changes:

• NearbyTagLabelTest: each level gets its own icon, and critical gets the alert glyph.
• TagCardLayoutTest.theLongestNearbyStatusLineDoesNotMakeItsCardTaller: now checks the new line (five dots plus the icon) instead of the old "· Battery critical" text.

I also checked that the tests can fail. I made MEDIUM reuse the full icon and dropped the content description. That turned exactly four tests red: batteryIconGivesEveryLevelItsOwnIcon, everyLevelShowsAnIconAndKeepsTheWordForScreenReaders, everyLevelDrawsADifferentVisibleIconInBothThemes and theMediumIconIsReadAsBatteryMedium. Putting the code back turned them green again.

What I ran, and what I did not

• Ran:
  • ./gradlew testAll
  • python scripts/add_strings.py --check
  • ./gradlew :app:testEmulatorDebugAndroidTest on the managed aosp-atd device, filtered to TagCardBatteryIconTest and TagCardLayoutTest: 28 tests, 0 failures
• Not run locally: the full 580-test emulator suite. CI runs it on this PR.
• Not checked: I have not seen it on a phone with a real tag nearby. The screenshots come from the inflated card, not from a live sighting.