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/colorUtils.ts

@@ -139,8 +139,8 @@ export function getSkiaColorMatrix(baseFilter: BaseFilter, adj: ColorAdjustments
       0, 0, 0, 1, 0,
     ];
   } else if (baseFilter === 'leica') {
-    // LEITZ STREETLIFE CLASSIC — the Leica character rather than a saturation
-    // push. What makes a Leica file read as one is the separation BETWEEN the
+    // LC STREETLIFE CLASSIC — the rangefinder character rather than a saturation
+    // push. What makes this file read as one is the separation BETWEEN the
     // hues, so the deepening lives in the off-diagonal terms, not in a global
     // chroma gain:
     //   - the three rows sum to 1.00/1.00/0.995, so greys stay exactly grey and
@@ -158,7 +158,7 @@ export function getSkiaColorMatrix(baseFilter: BaseFilter, adj: ColorAdjustments
       0, 0, 0, 1, 0,
     ];
   } else if (baseFilter === 'leica-vivid') {
-    // LEITZ STREETLIFE VIVID — the same Leica channel separation pushed into the
+    // LC STREETLIFE VIVID — the same slanted channel separation pushed into the
     // digital era: ~20% of chroma gain (still well under Velvia's 39%, so it
     // sparkles instead of shouting) on the same warm R>G>B bias CLASSIC has, so
     // VIVID is a brighter read of one look rather than a second, neutral one.
@@ -285,26 +285,6 @@ export function applyExposureGain(matrix: number[], evStops: number): number[] {
   return multiplyMatrices(gainMat, matrix);
 }
 
-// Compute a tint color + opacity from the matrix for camera overlay preview
-// Applies the matrix to white (1,1,1,1) to see what color cast the filter creates
-export function computeMatrixTint(matrix: number[]): { r: number; g: number; b: number; a: number } {
-  const apply = (r: number, g: number, b: number, a: number) => {
-    const row = (offset: number) =>
-      matrix[offset + 0] * r + matrix[offset + 1] * g + matrix[offset + 2] * b + matrix[offset + 3] * a + matrix[offset + 4];
-    return { r: row(0), g: row(5), b: row(10), a: row(15) };
-  };
-
-  // Apply matrix to neutral white to get the filter's color cast
-  const white = apply(1, 1, 1, 1);
-  // Clamp and compute perceived intensity to determine opacity
-  const clamp = (v: number) => Math.max(0, Math.min(1, v));
-  const intensity = (white.r + white.g + white.b) / 3;
-  // Opacity is higher when the filter deviates from neutral
-  const deviation = Math.abs(white.r - intensity) + Math.abs(white.g - intensity) + Math.abs(white.b - intensity);
-  const opacity = Math.min(0.35, deviation * 2.5);
-  return { r: clamp(white.r), g: clamp(white.g), b: clamp(white.b), a: opacity };
-}
-
 // 4x5 Matrix multiplication utility: A * B
 function multiplyMatrices(a: number[], b: number[]): number[] {
   const result = new Array(20).fill(0);