Add Projects, Milestones, RAG auto-inject, push notifications, PWA, tag normalisation

## Projects & Milestones (Phases A + G)
- New models: Project, Milestone (Project → Milestone → Task hierarchy)
- notes table: project_id + milestone_id FKs; parent_id FK constraint activated
- Migrations: 0017 (projects), 0018 (push_subscriptions), 0019 (events), 0020 (milestones)
- Services: projects.py, milestones.py (CRUD + progress tracking)
- Routes: /api/projects + /api/projects/<id>/milestones
- LLM tools: create/list/get/update project; create/list milestone; project + milestone + parent_task params on note/task tools
- Frontend: ProjectListView (stacked milestone bars), ProjectView (milestone-grouped kanban), ProjectSelector, MilestoneSelector, NoteEditorView + TaskEditorView updated

## RAG Auto-injection (Phase B)
- Notes ≥0.60 cosine similarity auto-injected into system prompt (max 3, 800 chars each)
- excluded_note_ids param; ChatView "Auto-included" sidebar section

## Summarisation improvements (Phase C)
- Threshold 20→30, keep-recent 6→8, max_tokens 200→400
- Two-pass summarisation for histories >50 messages

## Browser push notifications (Phase E)
- PushSubscription model + migration; pywebpush dependency
- /api/push routes; VAPID config; fire-and-forget on generation complete
- Frontend: sw.js, push store, Settings toggle

## PWA manifest (Phase F)
- manifest.json, Apple meta tags, service worker registration in main.ts

## Tag normalisation
- All tags lowercased + deduplicated at backend (create_note/update_note) and frontend (TagInput sanitize)
- Note/Task types gain project_id + milestone_id fields; store signatures updated

## CalDAV
- Radicale embedded server reverted; back to user-configured external CalDAV

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

src/fabledassistant/services/notes.py

@@ -9,12 +9,26 @@ from fabledassistant.models.note import Note, TaskPriority, TaskStatus
 logger = logging.getLogger(__name__)
 
 
+def _normalize_tags(tags: list[str]) -> list[str]:
+    """Lowercase, strip, deduplicate, and drop empty tags."""
+    seen: set[str] = set()
+    out: list[str] = []
+    for t in tags:
+        normalized = t.strip().lower()
+        if normalized and normalized not in seen:
+            seen.add(normalized)
+            out.append(normalized)
+    return out
+
+
 async def create_note(
     user_id: int,
     title: str = "",
     body: str = "",
     tags: list[str] | None = None,
     parent_id: int | None = None,
+    project_id: int | None = None,
+    milestone_id: int | None = None,
     status: str | None = None,
     priority: str | None = None,
     due_date: date | None = None,
@@ -24,8 +38,10 @@ async def create_note(
             user_id=user_id,
             title=title,
             body=body,
-            tags=tags or [],
+            tags=_normalize_tags(tags or []),
             parent_id=parent_id,
+            project_id=project_id,
+            milestone_id=milestone_id,
             status=status,
             priority=priority,
             due_date=due_date,
@@ -53,6 +69,8 @@ async def list_notes(
     priority: str | None = None,
     due_before: date | None = None,
     due_after: date | None = None,
+    project_id: int | None = None,
+    milestone_id: int | None = None,
     sort: str = "updated_at",
     order: str = "desc",
     limit: int = 50,
@@ -105,6 +123,14 @@ async def list_notes(
             query = query.where(Note.due_date >= due_after)
             count_query = count_query.where(Note.due_date >= due_after)
 
+        if project_id is not None:
+            query = query.where(Note.project_id == project_id)
+            count_query = count_query.where(Note.project_id == project_id)
+
+        if milestone_id is not None:
+            query = query.where(Note.milestone_id == milestone_id)
+            count_query = count_query.where(Note.milestone_id == milestone_id)
+
         sort_col = getattr(Note, sort, Note.updated_at)
         if order == "asc":
             query = query.order_by(sort_col.asc())
@@ -153,6 +179,8 @@ async def update_note(user_id: int, note_id: int, **fields: object) -> Note | No
                 value = TaskStatus(value).value
             elif key == "priority" and isinstance(value, str):
                 value = TaskPriority(value).value
+            elif key == "tags" and isinstance(value, list):
+                value = _normalize_tags(value)
             setattr(note, key, value)
         note.updated_at = datetime.now(timezone.utc)
         await session.commit()