feat: app icon, name fix, and icon generation script

- scripts/generate_icons.sh: ImageMagick script — dark #09090b bg,
  white B and red R (#ef4444) at the same 480pt size, NotoSans-Bold.
  Generates icon, adaptive foreground, monochrome, and splash variants.
- app.json: name changed to 'Bincio Rec'; adaptive icon backgroundColor
  updated to #09090b; removed redundant backgroundImage

app.json

@@ -1,6 +1,6 @@
 {
   "expo": {
-    "name": "bincio-rec",
+    "name": "Bincio Rec",
     "slug": "bincio-rec",
     "scheme": "bincio-rec",
     "version": "1.0.0",
@@ -21,9 +21,8 @@
     "android": {
       "package": "com.bincio.rec",
       "adaptiveIcon": {
-        "backgroundColor": "#111111",
+        "backgroundColor": "#09090b",
         "foregroundImage": "./assets/android-icon-foreground.png",
-        "backgroundImage": "./assets/android-icon-background.png",
         "monochromeImage": "./assets/android-icon-monochrome.png"
       },
       "predictiveBackGestureEnabled": false,