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>

frontend/src/views/NoteEditorView.vue

@@ -10,6 +10,7 @@ import type { Editor } from "@tiptap/vue-3";
 import MarkdownToolbar from "@/components/MarkdownToolbar.vue";
 import TiptapEditor from "@/components/TiptapEditor.vue";
 import TagInput from "@/components/TagInput.vue";
+import ProjectSelector from "@/components/ProjectSelector.vue";
 
 const route = useRoute();
 const router = useRouter();
@@ -19,6 +20,7 @@ const toast = useToastStore();
 const title = ref("");
 const body = ref("");
 const tags = ref<string[]>([]);
+const projectId = ref<number | null>(null);
 const dirty = ref(false);
 const saving = ref(false);
 const showPreview = ref(false);
@@ -136,12 +138,14 @@ function dismissTagSuggestions() {
 let savedTitle = "";
 let savedBody = "";
 let savedTags: string[] = [];
+let savedProjectId: number | null = null;
 
 function markDirty() {
   dirty.value =
     title.value !== savedTitle ||
     body.value !== savedBody ||
-    JSON.stringify(tags.value) !== JSON.stringify(savedTags);
+    JSON.stringify(tags.value) !== JSON.stringify(savedTags) ||
+    projectId.value !== savedProjectId;
 }
 
 function onBodyUpdate(newVal: string) {
@@ -156,9 +160,11 @@ onMounted(async () => {
       title.value = store.currentNote.title;
       body.value = store.currentNote.body;
       tags.value = [...(store.currentNote.tags || [])];
+      projectId.value = store.currentNote.project_id ?? null;
       savedTitle = title.value;
       savedBody = body.value;
       savedTags = [...tags.value];
+      savedProjectId = projectId.value;
     }
   }
 });
@@ -172,10 +178,12 @@ async function save() {
         title: title.value,
         body: body.value,
         tags: tags.value,
+        project_id: projectId.value,
       });
       savedTitle = title.value;
       savedBody = body.value;
       savedTags = [...tags.value];
+      savedProjectId = projectId.value;
       dirty.value = false;
       toast.show("Note saved");
     } else {
@@ -183,6 +191,7 @@ async function save() {
         title: title.value,
         body: body.value,
         tags: tags.value,
+        project_id: projectId.value,
       });
       dirty.value = false;
       toast.show("Note created");
@@ -223,10 +232,11 @@ async function autoSave() {
   if (!isEditing.value || !dirty.value || saving.value) return;
   saving.value = true;
   try {
-    await store.updateNote(noteId.value!, { title: title.value, body: body.value, tags: tags.value });
+    await store.updateNote(noteId.value!, { title: title.value, body: body.value, tags: tags.value, project_id: projectId.value } as Record<string, unknown>);
     savedTitle = title.value;
     savedBody = body.value;
     savedTags = [...tags.value];
+    savedProjectId = projectId.value;
     dirty.value = false;
     toast.show("Auto-saved");
   } catch {
@@ -290,6 +300,13 @@ onUnmounted(() => window.removeEventListener("beforeunload", onBeforeUnload));
         @input="markDirty"
       />
 
+      <div class="field-row-meta">
+        <div class="meta-field">
+          <label class="meta-label">Project</label>
+          <ProjectSelector v-model="projectId" @update:modelValue="markDirty" />
+        </div>
+      </div>
+
       <TagInput
         v-model="tags"
         :fetchTags="(q: string) => store.fetchAllTags(q)"
@@ -480,4 +497,25 @@ onUnmounted(() => window.removeEventListener("beforeunload", onBeforeUnload));
   </main>
 </template>
 
-<style src="@/assets/editor-shared.css" />
+<style src="@/assets/editor-shared.css" />
+<style scoped>
+.field-row-meta {
+  display: flex;
+  gap: 1rem;
+  flex-wrap: wrap;
+  margin-bottom: 0.25rem;
+}
+.meta-field {
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+  min-width: 180px;
+  flex: 1;
+  max-width: 300px;
+}
+.meta-label {
+  font-size: 0.8rem;
+  color: var(--color-text-secondary);
+  font-weight: 500;
+}
+</style>