Android: dark system-bar icons (visible on the white app)

Under Android edge-to-edge the status/nav bar icons default to light (white) and
vanished on the white app (clock/battery/nav invisible). Set SafeArea
statusBarStyle/navigationBarStyle to LIGHT (= dark content on a light background)
in capacitor.config.json, and add a runtime SafeArea.setSystemBarsStyle call in
home.html so already-installed APKs get dark icons on relaunch (no rebuild). iOS
unaffected (its status bar already shows dark content on white).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

mobile/capacitor.config.json

@@ -14,7 +14,9 @@
     "SafeArea": {
       "detectViewportFitCoverChanges": true,
       "initialViewportFitCover": true,
-      "offsetForKeyboardInsetBug": true
+      "offsetForKeyboardInsetBug": true,
+      "statusBarStyle": "LIGHT",
+      "navigationBarStyle": "LIGHT"
     },
     "SystemBars": {
       "insetsHandling": "disable"