Offer three denoise networks and a method to choose between them

AI Denoise's Apply switch becomes Method: Bilinear, Fast, Medium, Best,
default Best, so an untouched raw writes nothing and develops through the
mixture. `apply` is still read and never written: 0 is Bilinear, 1 keeps
a network already chosen.

- Best is the mixture of a flat and an edge expert with a learned gate;
  Medium and Fast are students distilled from it. 2.48 s, 0.79 s and
  0.57 s for a 20 MP frame on TensorRT fp16.
- Each network carries its own tile border (256 for the mixture, 192 for
  the students) through `dr_denoise::Shipped` and `TileNet::halo`.
- The file is hashed once at open and each network keys its own cached
  result; Bilinear keeps the result in memory for the way back.
- Each has an .a16w16 sibling for the Hexagon: 0.00 dB on the 6D gate,
  at most 0.11 dB with the noise scaled x0.5 to x4.
- APK BUNDLED 19 -> 23; the PKGBUILD installs all three.

apps/darkroom-android/src/lib.rs

@@ -338,7 +338,7 @@ fn unpack_bundled_models(app: &slint::android::AndroidApp) {
     // sibling when the probe chose that rung and ignores it otherwise. The
     // segmenter's and XFeat's forms are compiled into the binary instead,
     // beside their f32 graphs.
-    const BUNDLED: [(&std::ffi::CStr, &str); 19] = [
+    const BUNDLED: [(&std::ffi::CStr, &str); 23] = [
         (c"models/scrfd_500m_640.onnx", "scrfd_500m_640.onnx"),
         (
             c"models/scrfd_500m_640.a16w8.onnx",
@@ -372,8 +372,23 @@ fn unpack_bundled_models(app: &slint::android::AndroidApp) {
         // The panorama border filler (FR-MRG-4); MIT, 28 MB.
         (c"models/migan-512.onnx", "migan-512.onnx"),
         (c"models/migan-512.a16w16.onnx", "migan-512.a16w16.onnx"),
-        (c"models/mosaic-1408.onnx", "mosaic-1408.onnx"),
-        (c"models/mosaic-1408.a16w16.onnx", "mosaic-1408.a16w16.onnx"),
+        // The learned demosaic and denoise, one network per method
+        // (FR-DEV-3g), each with the 16-bit form the Hexagon runs.
+        (c"models/mosaic-fast-1408.onnx", "mosaic-fast-1408.onnx"),
+        (
+            c"models/mosaic-fast-1408.a16w16.onnx",
+            "mosaic-fast-1408.a16w16.onnx",
+        ),
+        (c"models/mosaic-medium-1408.onnx", "mosaic-medium-1408.onnx"),
+        (
+            c"models/mosaic-medium-1408.a16w16.onnx",
+            "mosaic-medium-1408.a16w16.onnx",
+        ),
+        (c"models/mosaic-best-1408.onnx", "mosaic-best-1408.onnx"),
+        (
+            c"models/mosaic-best-1408.a16w16.onnx",
+            "mosaic-best-1408.a16w16.onnx",
+        ),
     ];
 
     let dir = dr_ui::shared_face_models_dir();