feat(panel): RESET shows a star while the look differs from a clean start

App.tsx

@@ -28,6 +28,14 @@ import { PARAM_DEFS } from './src/utils/paramDefs';
 // @ts-ignore
 import './global.css';
 
+// Shallow value diff over the union of both objects' keys: undefined and a
+// missing key both read as "no value", so an old session without the newer
+// optional knobs is not reported as an edit.
+const differs = <T extends object>(a: T, b: T) => {
+  const keys = new Set([...Object.keys(a), ...Object.keys(b)]) as Set<keyof T>;
+  return [...keys].some((k) => (a[k] ?? null) !== (b[k] ?? null));
+};
+
 const SESSION_KEY = 'saved_session';
 const STARTUP_MODE_KEY = 'startup_mode';
 // Camera/device settings that survive restarts regardless of startup mode
@@ -523,8 +531,28 @@ export default function App() {
     setWmRotation(0);
     setPhotoRotation(0);
     setWallLandscape(false);
+    setCropRatio('none');
+    setCropRect(DEFAULT_CROP_RECT);
   };
 
+  // RESET lights up while the look differs from what handleResetAll puts back —
+  // every clause here has a matching setter there, or the star never goes out.
+  // The clean-start values: the startup sim, neutral knobs, no frame, no crop,
+  // both marks at their defaults, GPS stamp off, nothing rotated.
+  const resetDirty =
+    (selectedRecipe?.id ?? 'sim-provia') !== 'sim-provia' ||
+    differs(adjustments, DEFAULT_ADJUSTMENTS) ||
+    selectedFrame !== 'none' ||
+    differs(customWm, DEFAULT_CUSTOM_WM) ||
+    differs(customWmApplied, DEFAULT_CUSTOM_WM) ||
+    differs(gpsWm, DEFAULT_GPS_WM) ||
+    useGeotag ||
+    wmRotation !== 0 ||
+    photoRotation !== 0 ||
+    wallLandscape ||
+    cropRatio !== 'none' ||
+    differs(cropRect, DEFAULT_CROP_RECT);
+
   const handleUpdateAdjustments = (updates: Partial<ColorAdjustments>) => {
     // Storm guard, generic across every param: same-value writes (slider
     // micro-jitter / repeated pointer-move events) still build a fresh
@@ -1276,6 +1304,7 @@ export default function App() {
               currentRecipeId={selectedRecipe?.id || ''}
               adjustments={adjustments}
               onResetAll={handleResetAll}
+              resetDirty={resetDirty}
               selectedFrame={selectedFrame}
               cropRatio={cropRatio}
               onUpdateCropRatio={setCropRatio}

src/components/AdjustmentPanel.tsx

@@ -41,6 +41,9 @@ interface AdjustmentPanelProps {
   // RESET: the app's own defaults, from any tab — the startup look, every
   // parameter, the frame and the watermarks.
   onResetAll: () => void;
+  // True while the look differs from a clean start: the RESET chip says so
+  // ("RESET *", amber) instead of silently doing nothing visible.
+  resetDirty: boolean;
   selectedFrame: FrameId;
   // FRAME tab CROP. Only meaningful on the library's plain frames (the camera
   // composes through its ratio band, polaroid/wall through their own window),
@@ -179,6 +182,7 @@ export default function AdjustmentPanel({
   currentRecipeId,
   adjustments,
   onResetAll,
+  resetDirty,
   selectedFrame,
   cropRatio,
   onUpdateCropRatio,
@@ -327,8 +331,11 @@ export default function AdjustmentPanel({
   // one can sit off-screen just when it is wanted.
   const resetChip = (): ChipDef => ({
     key: 'reset-all',
-    label: 'RESET',
+    // Trailing star + amber text: there is a change to undo (the chip is
+    // otherwise a plain neutral RESET that puts the code back to a clean start).
+    label: resetDirty ? 'RESET *' : 'RESET',
     active: false,
+    amberValue: resetDirty,
     onPress: onResetAll,
   });