feat: add real PDF ingestion workflow

services/api/app/domain/models.py

@@ -50,6 +50,7 @@ class PlanLayer(BaseModel):
     category: str
     visible: bool = True
     source_names: list[str] = Field(default_factory=list)
+    element_count: int | None = None
 
 
 class PlanIssue(BaseModel):
@@ -63,9 +64,17 @@ class PlanIssue(BaseModel):
 class PlanState(BaseModel):
     source_name: str
     source_kind: str
+    source_object_key: str | None = None
+    preview_object_key: str | None = None
+    preview_width: int | None = None
+    preview_height: int | None = None
     page_count: int = 1
     vector_based: bool = False
+    vector_element_count: int = 0
     cad_layer_count: int = 0
+    ocr_used: bool = False
+    ocr_labels: list[str] = Field(default_factory=list)
+    ingestion_notes: list[str] = Field(default_factory=list)
     regions: list[PlanRegion] = Field(default_factory=list)
     selected_region_id: str | None = None
     layers: list[PlanLayer] = Field(default_factory=list)

services/api/app/domain/workflow.py

@@ -80,7 +80,13 @@ def apply_command(project: ProjectSnapshot, request: CommandRequest) -> ProjectS
     updated.failure_reason = None
 
     if request.command == WorkflowCommand.SELECT_REGION:
-        updated.plan.selected_region_id = request.payload.get("region_id")
+        region_id = str(request.payload.get("region_id", ""))
+        if not any(region.id == region_id for region in updated.plan.regions):
+            raise InvalidTransitionError(f"Region '{region_id}' does not exist in this project.")
+        updated.plan.selected_region_id = region_id
+        for issue in updated.plan.issues:
+            if issue.kind == "region":
+                issue.resolved = True
     elif request.command == WorkflowCommand.CONFIRM_PLAN:
         updated.plan.ceiling_height_mm = int(
             request.payload.get("ceiling_height_mm", updated.plan.ceiling_height_mm)