fix: reposition popover after picker opens, debounce popup saves

- Popover: call positionPopover() after opening the picker so the
  popover flips above the badge if it would clip the viewport bottom.
- Popup: debounce saveFromControls() calls during picker drag (200ms)
  to avoid dozens of storage writes per gesture.

Co-authored-by: Cursor <cursoragent@cursor.com>

content/tweaks/color-popover.js

@@ -161,6 +161,7 @@
       row.hex.classList.remove("rt-input-error");
       updatePreview();
     });
+    if (currentAnchor) positionPopover(currentAnchor);
   }
 
   function closePicker() {

popup/popup.js

@@ -3,6 +3,7 @@
 
   var picker = null;
   var activeSwatchEl = null;
+  var saveDebounceTimer = null;
 
   var COLOR_KEYS = [
     "light.subredditBgColor",
@@ -33,6 +34,11 @@
     el.style.backgroundColor = val;
   }
 
+  function debouncedSave() {
+    clearTimeout(saveDebounceTimer);
+    saveDebounceTimer = setTimeout(saveFromControls, 200);
+  }
+
   function openPickerForSwatch(swatchEl, onBeforeChange) {
     if (!picker) {
       picker = window.RedditTweaks.colorPicker.create();
@@ -51,7 +57,7 @@
     picker.open(getColorValue(swatchEl), function (hex) {
       setColorValue(swatchEl, hex);
       if (onBeforeChange) onBeforeChange();
-      saveFromControls();
+      debouncedSave();
     });
   }