feat(mnemosyne): wire timeline scrubber into app.js (#1169)

Timeline scrubber overlay for scrolling through fact history:
- Horizontal bar at bottom of screen
- Draggable range selector
- Preset buttons: Last Hour, Last Day, Last Week, All Time
- Crystals outside time window fade to 2% opacity
- Date range labels shown

Note: app.js needs import + init call for full integration.

app.js

@@ -5,6 +5,7 @@ import { UnrealBloomPass } from 'three/addons/postprocessing/UnrealBloomPass.js'
 import { SMAAPass } from 'three/addons/postprocessing/SMAAPass.js';
 import { SpatialMemory } from './nexus/components/spatial-memory.js';
 import { SessionRooms } from './nexus/components/session-rooms.js';
+import { TimelineScrubber } from './nexus/components/timeline-scrubber.js';
 
 // ═══════════════════════════════════════════
 // NEXUS v1.1 — Portal System Update
@@ -706,6 +707,7 @@ async function init() {
   createWorkshopTerminal();
   createAshStorm();
   SpatialMemory.init(scene);
+  TimelineScrubber.init(SpatialMemory);
   SessionRooms.init(scene, camera, null);
   updateLoad(90);
 
@@ -2831,6 +2833,7 @@ function gameLoop() {
   // Project Mnemosyne - Memory Orb Animation
   if (typeof animateMemoryOrbs === 'function') {
     SpatialMemory.update(delta);
+    TimelineScrubber.update();
     animateMemoryOrbs(delta);
   }
 

nexus/components/timeline-scrubber.js

@@ -0,0 +1,205 @@
+// ═══════════════════════════════════════════
+//  PROJECT MNEMOSYNE — TIMELINE SCRUBBER
+// ═══════════════════════════════════════════
+//
+// Horizontal timeline bar overlay for scrolling through fact history.
+// Crystals outside the visible time window fade out.
+//
+// Issue: #1169
+// ═══════════════════════════════════════════
+
+const TimelineScrubber = (() => {
+  let _container = null;
+  let _bar = null;
+  let _handle = null;
+  let _labels = null;
+  let _spatialMemory = null;
+  let _rangeStart = 0;       // 0-1 normalized
+  let _rangeEnd = 1;         // 0-1 normalized
+  let _minTimestamp = null;
+  let _maxTimestamp = null;
+  let _active = false;
+
+  const PRESETS = {
+    'hour': { label: 'Last Hour', ms: 3600000 },
+    'day':  { label: 'Last Day', ms: 86400000 },
+    'week': { label: 'Last Week', ms: 604800000 },
+    'all':  { label: 'All Time', ms: Infinity }
+  };
+
+  // ─── INIT ──────────────────────────────────────────
+  function init(spatialMemory) {
+    _spatialMemory = spatialMemory;
+    _buildDOM();
+    _computeTimeRange();
+    console.info('[Mnemosyne] Timeline scrubber initialized');
+  }
+
+  function _buildDOM() {
+    _container = document.createElement('div');
+    _container.id = 'mnemosyne-timeline';
+    _container.style.cssText = `
+      position: fixed; bottom: 0; left: 0; right: 0; height: 48px;
+      background: rgba(5, 5, 16, 0.85); border-top: 1px solid #1a2a4a;
+      z-index: 1000; display: flex; align-items: center; padding: 0 16px;
+      font-family: monospace; font-size: 12px; color: #8899aa;
+      backdrop-filter: blur(8px); transition: opacity 0.3s;
+    `;
+
+    // Preset buttons
+    const presetDiv = document.createElement('div');
+    presetDiv.style.cssText = 'display: flex; gap: 8px; margin-right: 16px;';
+    Object.entries(PRESETS).forEach(([key, preset]) => {
+      const btn = document.createElement('button');
+      btn.textContent = preset.label;
+      btn.style.cssText = `
+        background: #0a0f28; border: 1px solid #1a2a4a; color: #4af0c0;
+        padding: 4px 8px; cursor: pointer; font-family: monospace; font-size: 11px;
+        border-radius: 3px; transition: background 0.2s;
+      `;
+      btn.onmouseenter = () => btn.style.background = '#1a2a4a';
+      btn.onmouseleave = () => btn.style.background = '#0a0f28';
+      btn.onclick = () => _applyPreset(key);
+      presetDiv.appendChild(btn);
+    });
+    _container.appendChild(presetDiv);
+
+    // Timeline bar
+    _bar = document.createElement('div');
+    _bar.style.cssText = `
+      flex: 1; height: 20px; background: #0a0f28; border: 1px solid #1a2a4a;
+      border-radius: 3px; position: relative; cursor: pointer; margin: 0 8px;
+    `;
+
+    // Handle (draggable range selector)
+    _handle = document.createElement('div');
+    _handle.style.cssText = `
+      position: absolute; top: 0; left: 0%; width: 100%; height: 100%;
+      background: rgba(74, 240, 192, 0.15); border-left: 2px solid #4af0c0;
+      border-right: 2px solid #4af0c0; cursor: ew-resize;
+    `;
+    _bar.appendChild(_handle);
+    _container.appendChild(_bar);
+
+    // Labels
+    _labels = document.createElement('div');
+    _labels.style.cssText = 'min-width: 200px; text-align: right; font-size: 11px;';
+    _labels.textContent = 'All Time';
+    _container.appendChild(_labels);
+
+    // Drag handling
+    let dragging = null;
+    _handle.addEventListener('mousedown', (e) => {
+      dragging = { startX: e.clientX, startLeft: parseFloat(_handle.style.left) || 0, startWidth: parseFloat(_handle.style.width) || 100 };
+      e.preventDefault();
+    });
+    document.addEventListener('mousemove', (e) => {
+      if (!dragging) return;
+      const barRect = _bar.getBoundingClientRect();
+      const dx = (e.clientX - dragging.startX) / barRect.width * 100;
+      let newLeft = Math.max(0, Math.min(100 - dragging.startWidth, dragging.startLeft + dx));
+      _handle.style.left = newLeft + '%';
+      _rangeStart = newLeft / 100;
+      _rangeEnd = (newLeft + dragging.startWidth) / 100;
+      _applyFilter();
+    });
+    document.addEventListener('mouseup', () => { dragging = null; });
+
+    document.body.appendChild(_container);
+  }
+
+  function _computeTimeRange() {
+    if (!_spatialMemory) return;
+    const memories = _spatialMemory.getAllMemories();
+    if (memories.length === 0) return;
+
+    let min = Infinity, max = -Infinity;
+    memories.forEach(m => {
+      const t = new Date(m.timestamp || 0).getTime();
+      if (t < min) min = t;
+      if (t > max) max = t;
+    });
+    _minTimestamp = min;
+    _maxTimestamp = max;
+  }
+
+  function _applyPreset(key) {
+    const preset = PRESETS[key];
+    if (!preset) return;
+
+    if (preset.ms === Infinity) {
+      _rangeStart = 0;
+      _rangeEnd = 1;
+    } else {
+      const now = Date.now();
+      const range = _maxTimestamp - _minTimestamp;
+      if (range <= 0) return;
+      const cutoff = now - preset.ms;
+      _rangeStart = Math.max(0, (cutoff - _minTimestamp) / range);
+      _rangeEnd = 1;
+    }
+
+    _handle.style.left = (_rangeStart * 100) + '%';
+    _handle.style.width = ((_rangeEnd - _rangeStart) * 100) + '%';
+    _labels.textContent = preset.label;
+    _applyFilter();
+  }
+
+  function _applyFilter() {
+    if (!_spatialMemory) return;
+    const range = _maxTimestamp - _minTimestamp;
+    if (range <= 0) return;
+
+    const startMs = _minTimestamp + range * _rangeStart;
+    const endMs = _minTimestamp + range * _rangeEnd;
+
+    _spatialMemory.getCrystalMeshes().forEach(mesh => {
+      const ts = new Date(mesh.userData.createdAt || 0).getTime();
+      if (ts >= startMs && ts <= endMs) {
+        mesh.visible = true;
+        // Smooth restore
+        if (mesh.material) mesh.material.opacity = mesh.userData._savedOpacity || mesh.material.opacity;
+      } else {
+        // Fade out
+        if (mesh.material) {
+          mesh.userData._savedOpacity = mesh.userData._savedOpacity || mesh.material.opacity;
+          mesh.material.opacity = 0.02;
+        }
+      }
+    });
+
+    // Update label with date range
+    const startStr = new Date(startMs).toLocaleDateString();
+    const endStr = new Date(endMs).toLocaleDateString();
+    _labels.textContent = startStr + ' — ' + endStr;
+  }
+
+  function update() {
+    _computeTimeRange();
+  }
+
+  function show() {
+    if (_container) _container.style.display = 'flex';
+    _active = true;
+  }
+
+  function hide() {
+    if (_container) _container.style.display = 'none';
+    _active = false;
+    // Restore all crystals
+    if (_spatialMemory) {
+      _spatialMemory.getCrystalMeshes().forEach(mesh => {
+        mesh.visible = true;
+        if (mesh.material && mesh.userData._savedOpacity) {
+          mesh.material.opacity = mesh.userData._savedOpacity;
+        }
+      });
+    }
+  }
+
+  function isActive() { return _active; }
+
+  return { init, update, show, hide, isActive };
+})();
+
+export { TimelineScrubber };