feat(presets): add LEICA simulation chip; collapse recipe strip on sim select

src/utils/defaultRecipes.ts

@@ -43,6 +43,11 @@ export const FILM_SIMS: FilmSim[] = [
   { id: 'sim-astia', name: 'ASTIA', baseFilter: 'astia', adjustments: { ...DEFAULT_ADJUSTMENTS } },
   { id: 'sim-eterna', name: 'ETERNA', baseFilter: 'eterna', adjustments: { ...DEFAULT_ADJUSTMENTS } },
   { id: 'sim-acros', name: 'ACROS', baseFilter: 'monochrome', adjustments: { ...DEFAULT_ADJUSTMENTS } },
+  // Leica digital look (M/Q/SL) is NOT a film stock: neutral-but-warm colour
+  // with restrained saturation, deep open shadows and gentle highlight rolloff.
+  // Matrix-only here (like every sim) — the tonal half lives in the leica
+  // matrix (mild contrast + warm neutrality); users stack DR/tone on top.
+  { id: 'sim-leica', name: 'LEICA', baseFilter: 'leica', adjustments: { ...DEFAULT_ADJUSTMENTS } },
 ];
 
 // Film sim → full Recipe (never persisted; sims are applied on the fly).