fix: QA sweep -- SSE crash, memory leaks, HEIC Docker decode, TGA detection, lint cleanup

- Fix SSE write-after-end crash in progress.ts (remove callback before ending stream)
- Fix blob URL memory leaks: revoke processedPreviewUrl and old HEIC preview URLs
- Add AbortController to batch fetch in use-tool-processor and use-pipeline-processor
- Fix TGA format misidentified as CUR (extension overrides magic bytes)
- Add libheif-plugin-libde265 to Docker for HEIC/HEIF decode support
- Remove unused imports and state (AppLayout, setSampledColor, useEffect)
- Fix non-null assertions in meme-text-renderer and meme-generator
- Fix confusing void type in meme-templates
- Remove unnecessary useEffect deps in adjustments-panel
- Fix Playwright strict mode violations in 5 E2E tests

apps/web/src/components/editor/editor-options-bar.tsx

@@ -75,7 +75,6 @@ export function EditorOptionsBar() {
 
   // Eyedropper state (managed here since EyedropperOptions requires props)
   const [eyedropperSampleSize, setEyedropperSampleSize] = useState<SampleSize>(1);
-  const [sampledColor, setSampledColor] = useState<string | null>(null);
 
   // Transform tool API (managed here since TransformOptions requires props)
   const transformApi = useTransformTool();
@@ -98,7 +97,7 @@ export function EditorOptionsBar() {
           <EyedropperOptions
             sampleSize={eyedropperSampleSize}
             onSampleSizeChange={setEyedropperSampleSize}
-            sampledColor={sampledColor ?? foregroundColor}
+            sampledColor={foregroundColor}
           />
         )}
         {activeTool === "transform" && <TransformOptions api={transformApi} />}

apps/web/src/components/editor/panels/adjustments-panel.tsx

@@ -1062,10 +1062,9 @@ export function AdjustmentsPanel() {
       }
     }
 
-    // Capture on mount and when adjustments/filters change
     const timer = setTimeout(captureImageData, 100);
     return () => clearTimeout(timer);
-  }, [adjustments, filters, canvasSize]);
+  }, [canvasSize]);
 
   const hasChanges = useMemo(() => {
     const hasAdjustmentChanges = Object.values(adjustments).some((v) => v !== 0);

apps/web/src/components/layout/app-layout.tsx

@@ -7,7 +7,7 @@ import {
   Workflow,
   X,
 } from "lucide-react";
-import { useEffect, useState } from "react";
+import { useState } from "react";
 import { Link } from "react-router-dom";
 import { useMobile } from "@/hooks/use-mobile";
 import { cn } from "@/lib/utils";