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/ChatView.vue

@@ -37,9 +37,15 @@ let noteSearchTimer: ReturnType<typeof setTimeout> | null = null;
 const includedNoteIds = ref<Set<number>>(new Set());
 const includedNotes = ref<{ id: number; title: string }[]>([]);
 
-// Suggested notes — auto-found by search, not yet included
+// Suggested notes — auto-found by search, not yet included (score 0.45–0.59)
 const suggestedNotes = ref<{ id: number; title: string; score?: number | null }[]>([]);
 
+// Auto-injected notes — injected automatically because score >= 0.60
+const autoInjectedNotes = ref<{ id: number; title: string; score?: number | null }[]>([]);
+
+// Note IDs excluded from auto-injection on next message
+const excludedNoteIds = ref<number[]>([]);
+
 let prevConvId: number | null = null;
 
 const convId = computed(() => {
@@ -98,6 +104,8 @@ watch(convId, async (newId) => {
   includedNoteIds.value = new Set();
   includedNotes.value = [];
   suggestedNotes.value = [];
+  autoInjectedNotes.value = [];
+  excludedNoteIds.value = [];
   store.lastContextMeta = null;
   if (newId) {
     // Skip re-fetch if this conversation is already loaded (avoids race
@@ -118,14 +126,35 @@ watch(
 );
 
 watch(
-  () => store.lastContextMeta?.auto_notes,
-  (newNotes) => {
-    if (!newNotes) return;
+  () => store.lastContextMeta,
+  (meta) => {
+    if (!meta) return;
+
     const alreadyIncluded = includedNoteIds.value;
+    const alreadyAutoInjected = new Set(autoInjectedNotes.value.map((n) => n.id));
     const alreadySuggested = new Set(suggestedNotes.value.map((n) => n.id));
-    for (const note of newNotes) {
-      if (!alreadyIncluded.has(note.id) && !alreadySuggested.has(note.id)) {
-        suggestedNotes.value.push(note);
+
+    // Process auto_injected_notes (explicitly marked as injected)
+    const injectedFromMeta = meta.auto_injected_notes ?? [];
+    for (const note of injectedFromMeta) {
+      if (!alreadyAutoInjected.has(note.id) && !alreadyIncluded.has(note.id)) {
+        autoInjectedNotes.value.push(note);
+        alreadyAutoInjected.add(note.id);
+      }
+    }
+
+    // Process auto_notes — auto_injected flag separates injected from suggested
+    const autoNotes = meta.auto_notes ?? [];
+    for (const note of autoNotes) {
+      if (note.auto_injected) {
+        if (!alreadyAutoInjected.has(note.id) && !alreadyIncluded.has(note.id)) {
+          autoInjectedNotes.value.push(note);
+          alreadyAutoInjected.add(note.id);
+        }
+      } else {
+        if (!alreadyIncluded.has(note.id) && !alreadySuggested.has(note.id) && !alreadyAutoInjected.has(note.id)) {
+          suggestedNotes.value.push(note);
+        }
       }
     }
   }
@@ -182,6 +211,8 @@ async function sendMessage() {
     undefined,
     includedNoteIds.value.size ? [...includedNoteIds.value] : undefined,
     true, // enable thinking in the full chat view
+    undefined,
+    excludedNoteIds.value.length ? excludedNoteIds.value : undefined,
   );
   sending.value = false;
 
@@ -303,6 +334,14 @@ function includeNote(note: { id: number; title: string }) {
   includedNoteIds.value = new Set([...includedNoteIds.value, note.id]);
   includedNotes.value.push(note);
   suggestedNotes.value = suggestedNotes.value.filter((n) => n.id !== note.id);
+  autoInjectedNotes.value = autoInjectedNotes.value.filter((n) => n.id !== note.id);
+}
+
+function excludeAutoNote(noteId: number) {
+  autoInjectedNotes.value = autoInjectedNotes.value.filter((n) => n.id !== noteId);
+  if (!excludedNoteIds.value.includes(noteId)) {
+    excludedNoteIds.value = [...excludedNoteIds.value, noteId];
+  }
 }
 
 function removeIncludedNote(noteId: number) {
@@ -461,23 +500,31 @@ onUnmounted(() => {
           </div>
 
           <!-- Context sidebar -->
-          <aside v-if="includedNotes.length || suggestedNotes.length" class="context-sidebar">
-            <!-- IN CONTEXT section -->
-            <template v-if="includedNotes.length">
-              <div class="context-sidebar-header">In Context</div>
-
-              <!-- Explicitly included notes -->
-              <div v-for="note in includedNotes" :key="note.id" class="context-note context-note-included">
+          <aside v-if="autoInjectedNotes.length || includedNotes.length || suggestedNotes.length" class="context-sidebar">
+            <!-- AUTO-INCLUDED section -->
+            <template v-if="autoInjectedNotes.length">
+              <div class="context-sidebar-header">Auto-included</div>
+              <div v-for="note in autoInjectedNotes" :key="note.id" class="context-note context-note-auto">
                 <router-link :to="`/notes/${note.id}`" class="context-note-name">
                   {{ note.title }}
                 </router-link>
-                <button class="context-note-remove" @click="removeIncludedNote(note.id)" title="Remove from context">&times;</button>
+                <span
+                  v-if="note.score != null"
+                  class="context-note-score"
+                  :class="{
+                    'score-high':   note.score >= 0.75,
+                    'score-medium': note.score >= 0.60 && note.score < 0.75,
+                    'score-low':    note.score < 0.60,
+                  }"
+                  :title="`Relevance score: ${note.score}`"
+                >{{ Math.round(note.score * 100) }}%</span>
+                <button class="context-note-remove" @click="excludeAutoNote(note.id)" title="Exclude from auto-injection">&times;</button>
               </div>
             </template>
 
             <!-- SUGGESTED section -->
             <template v-if="suggestedNotes.length">
-              <div class="context-sidebar-header" :class="{ 'context-sidebar-header-gap': includedNotes.length }">Suggested</div>
+              <div class="context-sidebar-header" :class="{ 'context-sidebar-header-gap': autoInjectedNotes.length }">Suggested</div>
               <div v-for="note in suggestedNotes" :key="note.id" class="context-note context-note-suggested">
                 <router-link :to="`/notes/${note.id}`" class="context-note-name">
                   {{ note.title }}
@@ -495,6 +542,18 @@ onUnmounted(() => {
                 <button class="context-note-add" @click="includeNote(note)" title="Add to context">+</button>
               </div>
             </template>
+
+            <!-- IN CONTEXT section -->
+            <template v-if="includedNotes.length">
+              <div class="context-sidebar-header" :class="{ 'context-sidebar-header-gap': autoInjectedNotes.length || suggestedNotes.length }">In Context</div>
+              <!-- Explicitly included notes -->
+              <div v-for="note in includedNotes" :key="note.id" class="context-note context-note-included">
+                <router-link :to="`/notes/${note.id}`" class="context-note-name">
+                  {{ note.title }}
+                </router-link>
+                <button class="context-note-remove" @click="removeIncludedNote(note.id)" title="Remove from context">&times;</button>
+              </div>
+            </template>
           </aside>
         </div>
 
@@ -814,6 +873,9 @@ onUnmounted(() => {
 .context-note-included {
   border-color: var(--color-primary);
 }
+.context-note-auto {
+  border-color: var(--color-success);
+}
 .context-note-suggested {
   opacity: 0.85;
 }