Get rid of AppCompat (#2193)

We don't need it in a pure Compose app.

```diff
OLD: before.apk (signature: V2)
NEW: after.apk (signature: V2)

          │            compressed            │           uncompressed
          ├──────────┬──────────┬────────────┼──────────┬──────────┬────────────
 APK      │ old      │ new      │ diff       │ old      │ new      │ diff
──────────┼──────────┼──────────┼────────────┼──────────┼──────────┼────────────
      dex │  1.4 MiB │  1.4 MiB │  -89.6 KiB │  2.9 MiB │  2.8 MiB │ -174.1 KiB
     arsc │    2 MiB │  1.5 MiB │ -479.5 KiB │    2 MiB │  1.5 MiB │ -479.5 KiB
 manifest │  3.2 KiB │  3.2 KiB │       -1 B │ 14.3 KiB │ 14.3 KiB │        0 B
      res │  7.6 MiB │  7.4 MiB │ -156.1 KiB │ 17.4 MiB │ 17.2 MiB │   -191 KiB
   native │ 96.3 KiB │ 84.2 KiB │  -12.1 KiB │ 36.5 KiB │ 36.5 KiB │        0 B
    asset │    9 KiB │  8.6 KiB │     -439 B │ 70.9 KiB │ 68.2 KiB │   -2.7 KiB
    other │ 67.9 KiB │ 67.2 KiB │     -738 B │   73 KiB │   73 KiB │      -24 B
──────────┼──────────┼──────────┼────────────┼──────────┼──────────┼────────────
    total │ 11.2 MiB │ 10.5 MiB │ -738.5 KiB │ 22.5 MiB │ 21.7 MiB │ -847.4 KiB

 DEX     │ old   │ new   │ diff
─────────┼───────┼───────┼───────────────────────
   files │     1 │     1 │     0
 strings │ 14271 │ 13468 │  -803 (+2230 -3033)
   types │  4836 │  4595 │  -241 (+2220 -2461)
 classes │  3948 │  3783 │  -165 (+2127 -2292)
 methods │ 21189 │ 19507 │ -1682 (+16085 -17767)
  fields │ 13685 │ 12973 │  -712 (+12413 -13125)

 ARSC    │ old   │ new   │ diff
─────────┼───────┼───────┼──────────────────
 configs │   142 │   124 │   -18 (+0 -18)
 entries │ 13419 │ 12339 │ -1080 (+0 -1080)
```

app/build.gradle.kts

@@ -136,7 +136,6 @@ dependencies {
     val lifecycleVersion = "2.8.3"
     val hiltVersion = "2.51.1"
 
-    implementation("androidx.appcompat:appcompat:1.7.0")
     implementation("androidx.core:core-ktx:1.13.1")
     implementation("androidx.activity:activity-compose:1.9.0")
     implementation(platform("androidx.compose:compose-bom:2024.06.00"))

app/src/main/res/values/themes.xml

@@ -2,6 +2,6 @@
 <resources>
     <style name="Theme.Lawnicons.SplashScreen" parent="Theme.SplashScreen">
         <item name="windowSplashScreenAnimatedIcon">@drawable/splashscreen</item>
-        <item name="postSplashScreenTheme">@style/Theme.AppCompat.DayNight.NoActionBar</item>
+        <item name="postSplashScreenTheme">@style/android:Theme.Material.Light.NoActionBar</item>
     </style>
 </resources>