Swap app icon to the v3 design (record button + transcript mic)

- new icon source in icon/ (make_icon_v3.py + masters): near-black
  gradient tile, red record button with white bezel, mic capsule as a
  transcript card with red lines and a cursor
- Android: adaptive icon uses the 512px master as the full-bleed
  background layer (launcher masks crop it to shape) with a transparent
  foreground; old vector foreground and launcher color removed
- desktop: hicolor PNGs replaced at 32-512 px (48 regenerated from the
  master), old SVG removed; install.sh picks them up unchanged
- APK installed on the Fairphone; aapt2 confirms the adaptive icon

android/app/src/main/res/drawable/ic_launcher_foreground.xml

@@ -1,31 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="108dp"
-    android:height="108dp"
-    android:viewportWidth="108"
-    android:viewportHeight="108">
-    <!-- MeetRec glyph: mic + waveform (voice becoming transcript). -->
-    <path
-        android:fillColor="#FFFFFF"
-        android:pathData="M45.6,24.6h16.8a8.4,8.4 0 0 1 8.4,8.4v8.4a8.4,8.4 0 0 1 -8.4,8.4h-16.8a8.4,8.4 0 0 1 -8.4,-8.4v-8.4a8.4,8.4 0 0 1 8.4,-8.4z" />
-    <path
-        android:strokeColor="#FFFFFF"
-        android:strokeWidth="5.4"
-        android:strokeLineCap="round"
-        android:pathData="M37.2,42.6 v4.8 a16.8,16.8 0 0 0 33.6,0 v-4.8" />
-    <path
-        android:fillColor="#FFFFFF"
-        android:pathData="M34.8,71.4h4.8a2.4,2.4 0 0 1 2.4,2.4v3.6a2.4,2.4 0 0 1 -2.4,2.4h-4.8a2.4,2.4 0 0 1 -2.4,-2.4v-3.6a2.4,2.4 0 0 1 2.4,-2.4z" />
-    <path
-        android:fillColor="#FFFFFF"
-        android:pathData="M43.2,68.4h4.8a2.4,2.4 0 0 1 2.4,2.4v9.6a2.4,2.4 0 0 1 -2.4,2.4h-4.8a2.4,2.4 0 0 1 -2.4,-2.4v-9.6a2.4,2.4 0 0 1 2.4,-2.4z" />
-    <path
-        android:fillColor="#FFFFFF"
-        android:pathData="M51.6,70.8h4.8a2.4,2.4 0 0 1 2.4,2.4v4.8a2.4,2.4 0 0 1 -2.4,2.4h-4.8a2.4,2.4 0 0 1 -2.4,-2.4v-4.8a2.4,2.4 0 0 1 2.4,-2.4z" />
-    <path
-        android:fillColor="#FFFFFF"
-        android:pathData="M59.9,68.4h4.8a2.4,2.4 0 0 1 2.4,2.4v9.6a2.4,2.4 0 0 1 -2.4,2.4h-4.8a2.4,2.4 0 0 1 -2.4,-2.4v-9.6a2.4,2.4 0 0 1 2.4,-2.4z" />
-    <path
-        android:fillColor="#FFFFFF"
-        android:pathData="M68.4,71.4h4.8a2.4,2.4 0 0 1 2.4,2.4v3.6a2.4,2.4 0 0 1 -2.4,2.4h-4.8a2.4,2.4 0 0 1 -2.4,-2.4v-3.6a2.4,2.4 0 0 1 2.4,-2.4z" />
-</vector>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@color/launcher_bg" />
-    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <!-- meetrec icon v3 (see icon/make_icon_v3.py): near-black gradient
+         tile with a red record button; used full-bleed as the background
+         layer so the launcher mask crops it to shape. -->
+    <background android:drawable="@drawable/ic_launcher_bg" />
+    <foreground android:drawable="@drawable/ic_launcher_fg" />
 </adaptive-icon>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@color/launcher_bg" />
-    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <background android:drawable="@drawable/ic_launcher_bg" />
+    <foreground android:drawable="@drawable/ic_launcher_fg" />
 </adaptive-icon>

android/app/src/main/res/values/colors.xml

@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-    <color name="launcher_bg">#C0392B</color>
-</resources>