Edit page: auto-expand step textareas, wider layout, image management

- Textareas auto-resize to fit content (min 120px)
- Edit page container widened to 1100px
- Show recipe image with URL input and file upload options
- Add image upload endpoint (POST /api/recipes/<backend>/<id>/image)
- Add upload_image_bytes() to both Mealie and Tandoor clients

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/tandoor.py

@@ -235,6 +235,24 @@ class TandoorClient:
             "url": f"{self.base_url}/view/recipe/{recipe_id}",
         }
 
+    def upload_image_bytes(self, recipe_id: int, image_data: bytes,
+                           content_type: str = "image/jpeg") -> None:
+        """Upload raw image bytes to a recipe."""
+        ext = "jpg"
+        if "png" in content_type:
+            ext = "png"
+        elif "webp" in content_type:
+            ext = "webp"
+        files = {
+            "image": (f"recipe.{ext}", io.BytesIO(image_data), content_type),
+        }
+        r = self.session.put(
+            f"{self.api_url}/api/recipe/{recipe_id}/image/",
+            files=files,
+            timeout=30,
+        )
+        r.raise_for_status()
+
     # ------------------------------------------------------------------
     # Internal
     # ------------------------------------------------------------------