Ship HDF EFFECT to PRO only, and clean the build for Play

Rename LIGHT GLOW to HDF EFFECT and gate it behind PRO: LITE renders the
chip greyed out with a PRO tag and cannot open its slider; restoration of
older settings that carry hdf > 0 still blocks export in LITE.

Play/licence pass:
- drop unused permissions (ACTIVITY_RECOGNITION, READ_MEDIA_AUDIO/VIDEO,
  SYSTEM_ALERT_WINDOW) and requestLegacyExternalStorage
- rename the Leica sims to LC STREETLIFE CLASSIC/VIVID, drop the brand from
  comments; fix app name text, canvaskit copyright, LICENSE owner
- remove expo-image-picker and expo-sensors (no JS import), delete dead
  exports (computeMatrixTint, cinemaSeasonName, base64 helpers,
  formatCoordinate)
- versionCode 3 / versionName 1.2.1, drop the personal email from About
- add docs/privacy-policy.html for the Play listing

Size: R8 + shrinkResources + bundle compression + ABI trim, 161 MB -> 76 MB.

src/utils/jpegDpi.ts

@@ -8,41 +8,6 @@
 // If the JPEG carries neither JFIF nor EXIF, a minimal JFIF APP0 segment is
 // inserted right after SOI.
 
-const B64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
-
-export function base64ToBytes(b64: string): Uint8Array {
-  const clean = b64.replace(/\s+/g, '');
-  const out: number[] = [];
-  let buffer = 0;
-  let bits = 0;
-  for (const ch of clean) {
-    if (ch === '=') break;
-    const v = B64.indexOf(ch);
-    if (v < 0) continue;
-    buffer = (buffer << 6) | v;
-    bits += 6;
-    if (bits >= 8) {
-      bits -= 8;
-      out.push((buffer >> bits) & 0xff);
-    }
-  }
-  return Uint8Array.from(out);
-}
-
-export function bytesToBase64(bytes: Uint8Array): string {
-  let out = '';
-  for (let i = 0; i < bytes.length; i += 3) {
-    const b0 = bytes[i];
-    const b1 = i + 1 < bytes.length ? bytes[i + 1] : 0;
-    const b2 = i + 2 < bytes.length ? bytes[i + 2] : 0;
-    out += B64[b0 >> 2];
-    out += B64[((b0 & 3) << 4) | (b1 >> 4)];
-    out += i + 1 < bytes.length ? B64[((b1 & 15) << 2) | (b2 >> 6)] : '=';
-    out += i + 2 < bytes.length ? B64[b2 & 63] : '=';
-  }
-  return out;
-}
-
 function u16(bytes: Uint8Array, p: number): number {
   return (bytes[p] << 8) | bytes[p + 1];
 }