fix: resolve ONNX CUDA fallback, Docker e2e infrastructure, and all test failures

- Add safe_onnx_session() to gpu.py with graceful CUDA EP → CPU fallback
- Replace bare ort.InferenceSession() calls across colorize, restore, inpaint, remove_bg
- Add libcublas-12-6 to production Dockerfile for ONNX Runtime CUDA EP
- Add skipIfFeatureNotInstalled guards to remove-bg, blur-faces, smart-crop, ocr, noise-removal e2e specs
- Add AI tool install prompt detection in tools-all.spec.ts
- Add smart-crop to PYTHON_SIDECAR_TOOLS so frontend shows install prompt correctly
- Create Dockerfile.test.dockerignore to include tests/ in test image builds
- Add libheif-examples and exiftool to Dockerfile.test for HEIC and metadata tests
- Regenerate visual regression baselines for Docker/Linux and skip on non-Docker platforms

tests/e2e/noise-removal.spec.ts

@@ -83,7 +83,7 @@ test.describe("Noise Removal tool", () => {
   });
 
   test("GIF + AI tier warning appears and disappears correctly", async ({ loggedInPage: page }) => {
-    await page.goto("/noise-removal");
+    await skipIfFeatureNotInstalled(page);
     await uploadFile(page, fixturePath("animated.gif"));
 
     // No warning with balanced tier (default)
@@ -102,7 +102,7 @@ test.describe("Noise Removal tool", () => {
   test("PNG - quick tier removes noise and shows download button", async ({
     loggedInPage: page,
   }) => {
-    await page.goto("/noise-removal");
+    await skipIfFeatureNotInstalled(page);
     await uploadFile(page, fixturePath("test-200x150.png"));
 
     await page.getByRole("button", { name: "Quick" }).click();
@@ -119,7 +119,7 @@ test.describe("Noise Removal tool", () => {
   test("JPG - balanced tier removes noise and shows download button", async ({
     loggedInPage: page,
   }) => {
-    await page.goto("/noise-removal");
+    await skipIfFeatureNotInstalled(page);
     await uploadFile(page, fixturePath("test-100x100.jpg"));
 
     // Balanced is default, no need to click it
@@ -132,7 +132,7 @@ test.describe("Noise Removal tool", () => {
   test("WEBP output format - processes and download link is correct type", async ({
     loggedInPage: page,
   }) => {
-    await page.goto("/noise-removal");
+    await skipIfFeatureNotInstalled(page);
     await uploadFile(page, fixturePath("test-200x150.png"));
 
     await page.getByRole("button", { name: "Quick" }).click();
@@ -144,7 +144,7 @@ test.describe("Noise Removal tool", () => {
   });
 
   test("download link has correct href after processing", async ({ loggedInPage: page }) => {
-    await page.goto("/noise-removal");
+    await skipIfFeatureNotInstalled(page);
     await uploadFile(page, fixturePath("test-200x150.png"));
 
     await page.getByRole("button", { name: "Quick" }).click();