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

packages/ai/python/restore.py

@@ -483,7 +483,10 @@ def colorize_bw(img_bgr, intensity=0.85):
     from gpu import safe_onnx_session
 
     if not os.path.exists(DDCOLOR_MODEL_PATH):
-        return img_bgr, False
+        raise FileNotFoundError(
+            f"DDColor model not found at {DDCOLOR_MODEL_PATH}. "
+            "Install the 'object-eraser-colorize' bundle to enable colorization."
+        )
 
     session, _device = safe_onnx_session(DDCOLOR_MODEL_PATH)
     input_name = session.get_inputs()[0].name