Graph: label hubs cluster notes; unlinked notes float by default

Add labels as first-class nodes in the graph so tags act as visual
clustering hubs, and let unlinked notes float in the space by default —
per operator request (the graph is a light auxiliary lens, not a focal
surface).

Backend (graph.py):
- Emit a label-hub node (id "label:<uuid>", kind "label", #name, label
  color) for every label attached to a live note.
- Emit note -> label membership edges (kind "label") alongside the
  existing wiki-link edges (now kind "link").

Frontend (GraphView.vue):
- Render hubs as larger ringed nodes; membership edges dashed with a
  slightly longer spring rest so notes ring their hub.
- Default showAll (unlinked notes float) to true; add a Show labels
  toggle (default on) that hides hubs + membership edges.
- Click a label hub -> that label's board lens (/label/<id>); note
  clicks still open the editor.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FRgehjoz7Yv8LkUfADxACm

frontend/src/views/GraphView.vue

@@ -1,14 +1,19 @@
 <script setup lang="ts">
 import { computed, onBeforeUnmount, onMounted, ref } from "vue";
+import { useRouter } from "vue-router";
 import { api } from "../api/client";
 import { useNotesStore, type Note } from "../stores/notes";
 import { NOTE_NODE_FILL, type NoteColor } from "../notes/colors";
 import NoteEditor from "../components/NoteEditor.vue";
 
+type NodeKind = "note" | "label";
+
 interface GNode {
   id: string;
   title: string;
   color: string;
+  kind: NodeKind;
+  labelId?: string;
   x: number;
   y: number;
   vx: number;
@@ -17,18 +22,23 @@ interface GNode {
 interface GEdge {
   source: string;
   target: string;
+  kind?: string;
 }
 
 const WIDTH = 1000;
 const HEIGHT = 700;
 
+const router = useRouter();
 const notes = useNotesStore();
 const allNodes = ref<GNode[]>([]);
 const edges = ref<GEdge[]>([]);
 const loading = ref(true);
 const error = ref("");
 const editing = ref<Note | null>(null);
-const showAll = ref(false);
+// Unlinked notes float in the space by default — the graph is a gentle overview,
+// not a links-only surface. Label hubs are on by default so tags cluster notes.
+const showAll = ref(true);
+const showLabels = ref(true);
 
 const svgRef = ref<SVGSVGElement | null>(null);
 const gRef = ref<SVGGElement | null>(null);
@@ -41,29 +51,39 @@ const ty = ref(0);
 let frame = 0;
 let raf = 0;
 
+// Label membership edges drop out when the label hubs are hidden.
+const visibleEdges = computed(() =>
+  showLabels.value ? edges.value : edges.value.filter((e) => e.kind !== "label"),
+);
+
 const connectedIds = computed(() => {
   const s = new Set<string>();
-  for (const e of edges.value) {
+  for (const e of visibleEdges.value) {
     s.add(e.source);
     s.add(e.target);
   }
   return s;
 });
 
-// Connected notes only by default; the toggle adds unlinked ones.
+// Hide label hubs when toggled off; otherwise show everything (unlinked notes
+// float too) unless "show unlinked" is off, in which case keep only connected nodes.
 const activeNodes = computed(() =>
-  showAll.value ? allNodes.value : allNodes.value.filter((n) => connectedIds.value.has(n.id)),
+  allNodes.value.filter((n) => {
+    if (n.kind === "label" && !showLabels.value) return false;
+    if (showAll.value) return true;
+    return connectedIds.value.has(n.id);
+  }),
 );
 const activeIds = computed(() => new Set(activeNodes.value.map((n) => n.id)));
 
 const edgeLines = computed(() => {
   const byId = new Map(allNodes.value.map((n) => [n.id, n]));
-  const out: { x1: number; y1: number; x2: number; y2: number }[] = [];
-  for (const e of edges.value) {
+  const out: { x1: number; y1: number; x2: number; y2: number; label: boolean }[] = [];
+  for (const e of visibleEdges.value) {
     if (!activeIds.value.has(e.source) || !activeIds.value.has(e.target)) continue;
     const s = byId.get(e.source);
     const t = byId.get(e.target);
-    if (s && t) out.push({ x1: s.x, y1: s.y, x2: t.x, y2: t.y });
+    if (s && t) out.push({ x1: s.x, y1: s.y, x2: t.x, y2: t.y, label: e.kind === "label" });
   }
   return out;
 });
@@ -76,9 +96,10 @@ async function loadGraph() {
   loading.value = true;
   error.value = "";
   try {
-    const res = await api.get<{ nodes: { id: string; title: string; color: string }[]; edges: GEdge[] }>(
-      "/api/graph",
-    );
+    const res = await api.get<{
+      nodes: { id: string; title: string; color: string; kind: NodeKind; label_id?: string }[];
+      edges: GEdge[];
+    }>("/api/graph");
     const cx = WIDTH / 2;
     const cy = HEIGHT / 2;
     const count = Math.max(res.nodes.length, 1);
@@ -88,6 +109,8 @@ async function loadGraph() {
         id: n.id,
         title: n.title,
         color: n.color,
+        kind: n.kind,
+        labelId: n.label_id,
         x: cx + Math.cos(angle) * 220 + (Math.random() - 0.5) * 40,
         y: cy + Math.sin(angle) * 220 + (Math.random() - 0.5) * 40,
         vx: 0,
@@ -141,14 +164,16 @@ function simulate() {
     }
   }
 
-  for (const e of edges.value) {
+  for (const e of visibleEdges.value) {
     const s = byId.get(e.source);
     const t = byId.get(e.target);
     if (!s || !t) continue;
     const dx = t.x - s.x;
     const dy = t.y - s.y;
     const d = Math.sqrt(dx * dx + dy * dy) || 0.01;
-    const diff = (d - 130) * 0.02;
+    // Label-membership springs sit a touch longer so hubs ring their notes.
+    const rest = e.kind === "label" ? 150 : 130;
+    const diff = (d - rest) * 0.02;
     const fx = (dx / d) * diff;
     const fy = (dy / d) * diff;
     s.vx += fx;
@@ -228,8 +253,17 @@ function onUp() {
   const moved = dragMoved;
   dragNode = null;
   panning = false;
-  // A press without a drag is a click → open the note.
-  if (node && !moved) void openNode(node);
+  // A press without a drag is a click.
+  if (node && !moved) clickNode(node);
+}
+
+function clickNode(n: GNode) {
+  // Label hub → jump to that label's board lens (one space, many lenses).
+  if (n.kind === "label" && n.labelId) {
+    void router.push(`/label/${n.labelId}`);
+    return;
+  }
+  void openNode(n);
 }
 
 function onWheel(e: WheelEvent) {
@@ -254,6 +288,11 @@ function toggleAll() {
   reheat();
 }
 
+function toggleLabels() {
+  showLabels.value = !showLabels.value;
+  reheat();
+}
+
 async function openNode(n: GNode) {
   const found = notes.items.find((x) => x.id === n.id);
   editing.value = found ?? (await notes.fetchOne(n.id));
@@ -279,6 +318,10 @@ onBeforeUnmount(() => {
     <div class="mb-3 flex flex-wrap items-center justify-between gap-3">
       <h1 class="text-lg font-semibold">Graph</h1>
       <div class="flex items-center gap-3 text-sm">
+        <label class="flex cursor-pointer items-center gap-1.5 text-neutral-600 dark:text-neutral-300">
+          <input type="checkbox" class="accent-brand" :checked="showLabels" @change="toggleLabels" />
+          Show labels
+        </label>
         <label class="flex cursor-pointer items-center gap-1.5 text-neutral-600 dark:text-neutral-300">
           <input type="checkbox" class="accent-brand" :checked="showAll" @change="toggleAll" />
           Show unlinked notes
@@ -316,9 +359,10 @@ onBeforeUnmount(() => {
     </div>
 
     <div v-else-if="activeNodes.length === 0" class="py-24 text-center">
-      <h2 class="text-lg font-semibold text-neutral-700 dark:text-neutral-200">No links yet</h2>
+      <h2 class="text-lg font-semibold text-neutral-700 dark:text-neutral-200">Nothing connected yet</h2>
       <p class="mt-1 text-sm text-neutral-400">
-        Link notes with <span class="font-mono text-brand-700 dark:text-brand">[[Note title]]</span>, or
+        Link notes with <span class="font-mono text-brand-700 dark:text-brand">[[Note title]]</span>, add
+        <span class="font-mono text-brand-700 dark:text-brand">#tags</span>, or
         <button type="button" class="text-brand-700 underline dark:text-brand" @click="toggleAll">
           show all notes
         </button>.
@@ -346,10 +390,23 @@ onBeforeUnmount(() => {
             :x2="l.x2"
             :y2="l.y2"
             class="stroke-neutral-300 dark:stroke-neutral-700"
-            stroke-width="1.5"
+            :stroke-width="l.label ? 1 : 1.5"
+            :stroke-dasharray="l.label ? '3 3' : undefined"
           />
           <g v-for="n in activeNodes" :key="n.id" class="cursor-pointer" @mousedown="onNodeDown(n, $event)">
+            <!-- Label hubs read as a larger ringed node so tags stand out from notes. -->
             <circle
+              v-if="n.kind === 'label'"
+              :cx="n.x"
+              :cy="n.y"
+              r="12"
+              :fill="fill(n.color)"
+              fill-opacity="0.9"
+              class="stroke-neutral-50 dark:stroke-neutral-950"
+              stroke-width="3"
+            />
+            <circle
+              v-else
               :cx="n.x"
               :cy="n.y"
               r="8"
@@ -359,9 +416,13 @@ onBeforeUnmount(() => {
             />
             <text
               :x="n.x"
-              :y="n.y - 13"
+              :y="n.kind === 'label' ? n.y - 17 : n.y - 13"
               text-anchor="middle"
-              class="fill-neutral-600 text-[12px] dark:fill-neutral-300"
+              :class="
+                n.kind === 'label'
+                  ? 'fill-neutral-700 text-[12px] font-semibold dark:fill-neutral-100'
+                  : 'fill-neutral-600 text-[12px] dark:fill-neutral-300'
+              "
             >
               {{ n.title }}
             </text>

src/thoughtsync/graph.py

@@ -16,10 +16,21 @@ bp = Blueprint("graph", __name__, url_prefix="/api/graph")
 @bp.get("")
 @login_required
 async def get_graph():
-    """Wiki-link graph. Nodes are ALL of the owner's non-trashed notes (the frontend
-    toggles whether to show unlinked ones); each carries its first label's color for
-    clustering. Edges are resolved [[links]] (note_links.target_norm matched to a
-    note's normalized display_title — its explicit title or first body line)."""
+    """Spatial view of the owner's non-trashed notes.
+
+    Nodes are two kinds:
+      - notes (kind="note") — every non-trashed note; each carries its first
+        label's color for tinting.
+      - labels (kind="label", id "label:<uuid>") — every label actually attached
+        to a live note, acting as a clustering HUB so tagged notes gravitate
+        together even without wiki-links between them.
+    Edges are two kinds:
+      - wiki-links (kind="link") — resolved [[links]] (note_links.target_norm
+        matched to a note's normalized display_title).
+      - membership (kind="label") — each note → each of its label hubs.
+    The frontend toggles labels + unlinked notes; the graph is a light auxiliary
+    lens, not a focal surface.
+    """
     source = aliased(Note)
     target = aliased(Note)
     edge_stmt = (
@@ -44,26 +55,51 @@ async def get_graph():
             if key in seen:
                 continue
             seen.add(key)
-            edges.append({"source": str(src_id), "target": str(tgt_id)})
+            edges.append({"source": str(src_id), "target": str(tgt_id), "kind": "link"})
 
-        # First label color per note (labels ordered by name) → node color.
-        color_rows = (
+        # Note ↔ label membership: one row per (note, label) for the owner's
+        # non-trashed notes. Drives both the note-color tint (first label by name)
+        # and the label-hub nodes + membership edges.
+        label_rows = (
             await db.execute(
-                select(NoteLabel.note_id, Label.color)
+                select(NoteLabel.note_id, Label.id, Label.name, Label.color)
                 .join(Label, Label.id == NoteLabel.label_id)
-                .where(Label.owner_id == g.user_id)
+                .join(Note, Note.id == NoteLabel.note_id)
+                .where(
+                    Label.owner_id == g.user_id,
+                    Note.owner_id == g.user_id,
+                    Note.deleted_at.is_(None),
+                )
                 .order_by(Label.name)
             )
         ).all()
+
         first_color: dict = {}
-        for note_id, color in color_rows:
-            first_color.setdefault(note_id, color)
+        label_nodes: dict = {}
+        for note_id, label_id, label_name, label_color in label_rows:
+            first_color.setdefault(note_id, label_color)
+            hub_id = f"label:{label_id}"
+            if hub_id not in label_nodes:
+                label_nodes[hub_id] = {
+                    "id": hub_id,
+                    "title": f"#{label_name}",
+                    "color": label_color or "default",
+                    "kind": "label",
+                    "label_id": str(label_id),
+                }
+            edges.append({"source": str(note_id), "target": hub_id, "kind": "label"})
 
         note_rows = (
             await db.scalars(select(Note).where(Note.owner_id == g.user_id, Note.deleted_at.is_(None)))
         ).all()
         nodes = [
-            {"id": str(n.id), "title": n.display_title or "Untitled", "color": first_color.get(n.id, "default")}
+            {
+                "id": str(n.id),
+                "title": n.display_title or "Untitled",
+                "color": first_color.get(n.id, "default"),
+                "kind": "note",
+            }
             for n in note_rows
         ]
+        nodes.extend(label_nodes.values())
         return jsonify({"nodes": nodes, "edges": edges})