fix: QA sweep — 7 bugs fixed, 17 test corrections

Code fixes:
- Sidebar state bleed: reset file store on HomePage mount
- restore-photo: raise error instead of silently skipping colorize
  when DDColor model missing
- PaddleOCR OOM: cap input images to 2048px before OCR inference
- Torch CPU optimization: use --index-url .../whl/cpu on CPU nodes

Test fixes:
- upscale: add exact:true to scale factor button locators
- smart-crop: add exact:true to "Pad to square" locator
- colorize: use regex for model button names (Best/Balanced/Fast)
- enhance-faces: use .first() for ambiguous percentage display
- passport-photo: fix DPI locator, .or() compound, generate fallback
- people: update maxUsers assertions for unlimited (0) default
- automate: "Save Pipeline" → "Save" matching actual button text
- tools.test: add resize to Sharp mock chain for OCR tests

tests/e2e/smart-crop.spec.ts

@@ -77,7 +77,7 @@ test.describe("Smart Crop tool", () => {
     await page.getByRole("button", { name: "Auto Trim" }).click();
 
     await expect(page.getByText("Tolerance")).toBeVisible();
-    await expect(page.getByText("Pad to square")).toBeVisible();
+    await expect(page.getByText("Pad to square", { exact: true })).toBeVisible();
   });
 
   test("aspect ratio presets update dimensions", async ({ loggedInPage: page }) => {