Support re-import for recipes without a source URL

Recipes imported by drag & drop / file-picker record no source_path and
were rejected by re-import. Fall back to the recipe's own saved image,
which still carries the original embedded generation metadata.

Re-import now re-parses that original metadata instead of the appended
recipe JSON block, so parser upgrades produce fresh results. The
already-optimized preview image is kept verbatim: only its WebP EXIF
chunk is rewritten in place to replace the recipe metadata block, and
the recipe JSON is rewritten with the new analysis plus carried-over
user edits.

tests/routes/test_recipe_routes.py

@@ -197,6 +197,7 @@ class StubAnalysisService:
         self.upload_calls: List[bytes] = []
         self.remote_calls: List[Optional[str]] = []
         self.local_calls: List[Optional[str]] = []
+        self.local_ignore_recipe_metadata_calls: List[bool] = []
         self.result = SimpleNamespace(payload={"loras": []}, status=200)
         self._recipe_parser_factory: Any = None
         StubAnalysisService.instances.append(self)
@@ -218,11 +219,16 @@ class StubAnalysisService:
         return self.result
 
     async def analyze_local_image(
-        self, *, file_path: Optional[str], recipe_scanner
+        self,
+        *,
+        file_path: Optional[str],
+        recipe_scanner,
+        ignore_recipe_metadata: bool = False,
     ) -> SimpleNamespace:  # noqa: D401
         if self.raise_for_local:
             raise self.raise_for_local
         self.local_calls.append(file_path)
+        self.local_ignore_recipe_metadata_calls.append(ignore_recipe_metadata)
         return self.result
 
     async def analyze_widget_metadata(self, *, recipe_scanner) -> SimpleNamespace:
@@ -257,6 +263,7 @@ class StubPersistenceService:
         extension=None,
         recipe_id=None,
         target_dir=None,
+        skip_optimize=False,
     ) -> SimpleNamespace:  # noqa: D401
         self.save_calls.append(
             {
@@ -269,6 +276,7 @@ class StubPersistenceService:
                 "extension": extension,
                 "recipe_id": recipe_id,
                 "target_dir": target_dir,
+                "skip_optimize": skip_optimize,
             }
         )
         return self.save_result
@@ -2168,3 +2176,73 @@ async def test_checkpoint_mark_hash_invalid_route_requires_recipe_id(
             json={},
         )
         assert response.status == 400
+
+
+async def test_reimport_without_source_path_falls_back_to_recipe_file(
+    monkeypatch, tmp_path: Path
+) -> None:
+    """Drag & drop imports record no source_path; re-import must fall back to
+    the recipe's own saved image and re-parse ignoring the recipe metadata."""
+    async with recipe_harness(monkeypatch, tmp_path) as harness:
+        recipe_file = harness.tmp_dir / "recipes" / "rec1.webp"
+        recipe_file.parent.mkdir(parents=True, exist_ok=True)
+        recipe_file.write_bytes(b"fake-image")
+
+        harness.scanner.recipes["rec1"] = {
+            "id": "rec1",
+            "title": "Old title",
+            "file_path": str(recipe_file),
+            "tags": ["tag1"],
+            # no source_path on purpose
+        }
+        harness.analysis.result = SimpleNamespace(
+            payload={
+                "success": True,
+                "recipe_id": "new-rec",
+                "loras": [],
+            },
+            status=200,
+        )
+        harness.persistence.save_result = SimpleNamespace(
+            payload={"success": True, "recipe_id": "new-rec"}, status=200
+        )
+
+        response = await harness.client.post("/api/lm/recipe/rec1/reimport")
+        payload = await response.json()
+
+        assert response.status == 200
+        assert payload["success"] is True
+        assert payload["old_recipe_id"] == "rec1"
+        assert payload["recipe_id"] == "new-rec"
+        # Local analysis is used on the saved image, ignoring recipe metadata.
+        assert harness.analysis.local_calls == [str(recipe_file)]
+        assert harness.analysis.local_ignore_recipe_metadata_calls == [True]
+        # The old recipe is deleted after the fresh save.
+        assert harness.persistence.delete_calls == ["rec1"]
+        # The already-optimized preview image must be stored verbatim.
+        assert harness.persistence.save_calls[-1]["skip_optimize"] is True
+        assert harness.persistence.save_calls[-1]["image_bytes"] == b"fake-image"
+        # User edits (title, tags) are carried over to the new recipe.
+        assert harness.persistence.update_calls[-1]["recipe_id"] == "new-rec"
+        assert harness.persistence.update_calls[-1]["updates"]["title"] == "Old title"
+        assert harness.persistence.update_calls[-1]["updates"]["tags"] == ["tag1"]
+
+
+async def test_reimport_without_any_source_returns_400(
+    monkeypatch, tmp_path: Path
+) -> None:
+    """Recipes with neither source_path nor an accessible image cannot re-import."""
+    async with recipe_harness(monkeypatch, tmp_path) as harness:
+        harness.scanner.recipes["rec2"] = {
+            "id": "rec2",
+            "title": "No source",
+            "file_path": str(harness.tmp_dir / "recipes" / "missing.webp"),
+        }
+
+        response = await harness.client.post("/api/lm/recipe/rec2/reimport")
+        payload = await response.json()
+
+        assert response.status == 400
+        assert payload["success"] is False
+        assert harness.analysis.local_calls == []
+        assert harness.persistence.delete_calls == []