fix(android): unblock first device test — auth contrast + dynamic base URL

Two regressions surfaced on the first real device run.

1. Contrast on ServerUrl + Login screens: both wrapped content in a
   bare Box(fillMaxSize), no Surface. The obsidian background never
   painted (rendered against the system root view's default),
   LocalContentColor cascade fell through to Material's default
   contentColor — the screens rendered as near-invisible dark text
   on dark grey. Wrap both in Surface(color = background, contentColor
   = onBackground) so the bg paints AND the M3 contentColor pipeline
   flows correctly through OutlinedTextField labels / cursor /
   placeholders + the Button content tint.

2. The bigger bug: NetworkModule.provideRetrofit read
   authStore.baseUrl.value ONCE at Retrofit creation. AuthStore loads
   from Room async, so at injection time the value was still the
   localhost:8080 placeholder. Result: even after the user typed
   their real server URL on the ServerUrl screen, every API call
   kept hitting localhost:8080 ("Failed to connect to
   localhost/127.0.0.1:8080" on the login attempt). The pre-fix
   NetworkModule comment even acknowledged it — *"Server-URL
   changes require an app relaunch"*.

   Fix: per-request rewrite. New BaseUrlInterceptor reads the live
   AuthStore.baseUrl.value on every request and rewrites
   scheme/host/port of the outgoing URL. Retrofit now keeps a
   placeholder baseUrl ("http://placeholder.invalid/") solely to
   satisfy its parser; the actual target host is dynamic. Order in
   OkHttp chain: BaseUrl first → Auth → logging, so the cookie
   interceptor sees the final URL.

New:
  - api/BaseUrlInterceptor.kt — per-request scheme/host/port rewrite
    from AuthStore.baseUrl. Falls through to the original request
    when the stored URL is unparseable.

Modified:
  - api/NetworkModule.kt — adds BaseUrlInterceptor to the OkHttp
    chain. Drops the AuthStore dependency from provideRetrofit;
    swaps baseUrl for the placeholder.
  - auth/ui/ServerUrlScreen.kt — Box → Surface wrap.
  - auth/ui/LoginScreen.kt — Box → Surface wrap.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

android/app/build/intermediates/packaged_res/debug/packageDebugResources/values/values.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <array name="com_google_android_gms_fonts_certs">
+        <item>@array/com_google_android_gms_fonts_certs_dev</item>
+        <item>@array/com_google_android_gms_fonts_certs_prod</item>
+    </array>
+    <string-array name="com_google_android_gms_fonts_certs_dev">
+        <item>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</item>
+    </string-array>
+    <string-array name="com_google_android_gms_fonts_certs_prod">
+        <item>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</item>
+    </string-array>
+    <string name="app_name">Minstrel</string>
+    <style name="Theme.Minstrel" parent="android:Theme.Material.NoActionBar">
+        <item name="android:windowBackground">@android:color/black</item>
+    </style>
+</resources>