feat(mobile): improve login, profile, alerts screens and dark mode background

- Unify login/register into single screen with tab switcher, logo, and themed inputs
- Redesign profile with header card, segmented theme toggle, icon-based menu, and bottom-sheet modals
- Add auth guard to alerts screen showing login prompt instead of 401 error
- Switch ImageBackground to explicit Image+View layering for reliable rendering
- Add dark mode background image switching in root layout
- Add dark mode override for recent-tag in PWA search view

eas.json

@@ -0,0 +1,21 @@
+{
+  "cli": {
+    "version": ">= 20.5.1",
+    "appVersionSource": "remote"
+  },
+  "build": {
+    "development": {
+      "developmentClient": true,
+      "distribution": "internal"
+    },
+    "preview": {
+      "distribution": "internal"
+    },
+    "production": {
+      "autoIncrement": true
+    }
+  },
+  "submit": {
+    "production": {}
+  }
+}