fix(studio): keyframe bug fixes — gate delete hooks, fix value corruption, gesture recording (#1314)

- Gate stripStudioEditsFromTarget/bakeVisibilityOnDelete behind a
  stripStudioEdits flag on the delete mutation type so they only fire on
  user-initiated deletes, not on internal delete-then-recreate drags.

- Add bakeVisibilityOnDelete to the remove-all-keyframes handler so
  elements with CSS opacity:0 stay visible after collapsing keyframes.

- Fix integer rounding in readAllAnimatedProperties: use 3-decimal
  precision for visual properties (opacity, scale, rotation) instead of
  Math.round which corrupted mid-fade values to 0.

- Guard VISUAL_BASELINE against cross-tween contamination by querying
  __timelines for properties animated by other tweens on the same element.

- Harden bakeVisibilityOnDelete: reverse-scan keyframes for the last one
  containing opacity, guard against relative values (+=/-=/*=), and add
  Number.isFinite check.

- Fix falsy-zero doubling in drag commit: replace || fallback with
  Number.isFinite so a base GSAP position of 0 is correctly preserved.

- Fix gesture recording sign inversion: remove pointerElementOffset
  subtraction from dx/dy formula and instead apply it once to basePosition
  so the element center tracks the pointer.

- Fix TypeScript build errors in gsapSoftReload.ts (6 double-casts).

- Strip all diagnostic logs from production code.

packages/studio/src/hooks/useGestureCommit.ts

@@ -80,6 +80,12 @@ export function useGestureCommit({
       const simplified = simplifyGestureSamples(frozenSamples, duration, 5);
       const sortedPcts = Array.from(simplified.keys()).sort((a, b) => a - b);
 
+      // Ensure a 0% keyframe exists with the element's start-of-recording position
+      if (!simplified.has(0) && frozenSamples.length > 0) {
+        simplified.set(0, frozenSamples[0]!.properties);
+        if (!sortedPcts.includes(0)) sortedPcts.unshift(0);
+      }
+
       const selector = sel.id ? `#${sel.id}` : sel.selector;
       if (!selector) {
         showToast("Cannot save — element has no selector", "error");