fix(sim): rebuild the six film-sim color matrices to match the stock looks

Provia/Velvia/Astia/Classic Chrome/Classic Neg/Acros each get their own
primaries+cross-talk matrix measured against the pipeline, plus a split-tone
stage (shadow/highlight tint uniforms) for Classic Chrome's teal and Classic
Neg's green-cyan shadows vs warm highlights.

src/utils/nativeExport.ts

@@ -64,7 +64,10 @@ export async function processAndExportPhotoNative(
           getSkiaColorMatrix(recipe.baseFilter, adjustments),
           adjustments.exposureCompensation ?? 0
         );
-    const tone = getToneUniforms(adjustments);
+    // Base filter is passed so a stock's own tone pass is picked up, but the
+    // Kotlin side only reads toneDr/Hl/Sh — the split-tone RGB (Classic Neg) is
+    // preview/engine only. Nothing in the app calls nativeExport (dev probe).
+    const tone = getToneUniforms(adjustments, recipe.baseFilter);
     const cinema = getCinemaUniforms(recipe.cinema);
     // Final screen sharpen (engine #9): the sharpening knob (0..10) overrides
     // the legacy boolean sharpen flag (camera captures keep it true → 0.5).