Improve project/task/sub-task workflows across backend and web

Backend:
- notes.py: add parent_id filter to list_notes()
- routes/notes.py: expose project_id, milestone_id, parent_id, type
  query params on GET /api/notes
- milestones.py: add find_milestone_by_title() (cross-project search)
- tools.py: list_notes project filter + updated_at; list_tasks milestone
  without project; tag_mode default add; fail-fast project resolution

Web frontend:
- TaskEditorView: add sub-tasks section (fetch, toggle, create inline);
  pre-fill projectId/milestoneId/parentId from URL query params on new task
- ProjectView: add + button in Todo kanban column header linking to
  /tasks/new?projectId=X&milestoneId=Y for quick task creation

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

src/fabledassistant/services/tools.py

@@ -216,7 +216,7 @@ _CORE_TOOLS = [
             "name": "list_notes",
             "description": (
                 "Browse the user's notes (not tasks). Use this when the user asks to see, list, or browse "
-                "their notes — by recency, keyword, or tag. For tasks, use list_tasks instead."
+                "their notes — by recency, keyword, tag, or project. For tasks, use list_tasks instead."
             ),
             "parameters": {
                 "type": "object",
@@ -230,6 +230,10 @@ _CORE_TOOLS = [
                         "items": {"type": "string"},
                         "description": "Filter notes that have ALL of these tags",
                     },
+                    "project": {
+                        "type": "string",
+                        "description": "Filter notes by project name",
+                    },
                     "sort": {
                         "type": "string",
                         "enum": ["updated_at", "created_at", "title"],
@@ -904,6 +908,7 @@ async def execute_tool(user_id: int, tool_name: str, arguments: dict) -> dict:
             project_id = None
             milestone_id = None
             project_name = arguments.get("project")
+            milestone_name = arguments.get("milestone")
             if project_name:
                 from fabledassistant.services.projects import get_project_by_title, list_projects as _lp
                 proj = await get_project_by_title(user_id, project_name)
@@ -914,12 +919,17 @@ async def execute_tool(user_id: int, tool_name: str, arguments: dict) -> dict:
                         proj = matches[0]
                 if proj:
                     project_id = proj.id
-                    milestone_name = arguments.get("milestone")
                     if milestone_name:
                         from fabledassistant.services.milestones import get_milestone_by_title
                         ms = await get_milestone_by_title(user_id, proj.id, milestone_name)
                         if ms:
                             milestone_id = ms.id
+            elif milestone_name:
+                # No project specified — search milestone by name across all projects
+                from fabledassistant.services.milestones import find_milestone_by_title
+                ms = await find_milestone_by_title(user_id, milestone_name)
+                if ms:
+                    milestone_id = ms.id
             notes, total = await list_notes(
                 user_id=user_id,
                 is_task=True,
@@ -1097,11 +1107,24 @@ async def execute_tool(user_id: int, tool_name: str, arguments: dict) -> dict:
         elif tool_name == "list_notes":
             tags_raw = arguments.get("tags")
             tags = tags_raw if isinstance(tags_raw, list) else None
+            project_id = None
+            project_name = arguments.get("project")
+            if project_name:
+                from fabledassistant.services.projects import get_project_by_title as _gpbt, list_projects as _lp
+                proj = await _gpbt(user_id, project_name)
+                if proj is None:
+                    all_p = await _lp(user_id)
+                    matches = [p for p in all_p if project_name.lower() in p.title.lower()]
+                    proj = matches[0] if matches else None
+                if proj is None:
+                    return {"success": False, "error": f"Project '{project_name}' not found."}
+                project_id = proj.id
             notes, total = await list_notes(
                 user_id=user_id,
                 q=arguments.get("q") or arguments.get("query"),
                 tags=tags,
                 is_task=False,
+                project_id=project_id,
                 sort=arguments.get("sort", "updated_at"),
                 order="desc",
                 limit=int(arguments.get("limit", 10)),
@@ -1111,6 +1134,7 @@ async def execute_tool(user_id: int, tool_name: str, arguments: dict) -> dict:
                     "id": n.id,
                     "title": n.title,
                     "tags": n.tags or [],
+                    "updated_at": n.updated_at.isoformat(),
                     "preview": (n.body[:200] + "...") if n.body and len(n.body) > 200 else (n.body or ""),
                 }
                 for n in notes