Add JARVIS improvements: mobile UI, sparklines, suggestions, multi-step commands, Arc Reactor health, tier badges

- Mobile UI: 3-button bottom nav with panel switcher
- Chat history search: search modal with keyword query
- News filtering: category filter with localStorage persistence
- Proactive reminders: planner/appointment alerts at login and every 5 min
- Proactive alerts: polls every 60s, speaks new critical/warning alerts
- Agent sparklines: 2h CPU+MEM sparkline on each online agent card
- Tier source badge: KB/GROQ/CLAUDE/OLLAMA pill shown after each reply
- VM suggestions: 24h resource analysis via voice command
- HA scene control: fuzzy-match scene activation via voice
- Jellyfin control: pause/stop/next/previous via voice and KB
- Pattern suggestions: usage_patterns table + proactive chips every 30 min
- Multi-step commands: compound "X and Y" command parsing (Tier 0.5)
- Arc Reactor health: warning=amber/1.2s, critical=red/0.6s pulse encoding
- Cross-session history: last 6 turns loaded from prior session
- Restart agent: voice command to restart any JARVIS agent
- New endpoints: history.php, metrics.php, suggestions.php, jellyfin.php

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

api/endpoints/suggestions.php

@@ -0,0 +1,44 @@
+<?php
+// Proactive suggestions endpoint — returns time-based command suggestions
+require_once __DIR__ . '/../config.php';
+require_once __DIR__ . '/../../includes/auth.php';
+header('Content-Type: application/json');
+AuthMiddleware::requireAuth();
+
+$hour = (int)date('G');
+$dow  = (int)date('w'); // 0=Sun, 6=Sat
+
+// Find intents used 3+ times at this hour and day-of-week
+$rows = JarvisDB::query(
+    "SELECT intent_name, hit_count FROM usage_patterns
+     WHERE hour=? AND dow=? AND hit_count >= 3
+     ORDER BY hit_count DESC LIMIT 3",
+    [$hour, $dow]
+) ?? [];
+
+// Map intents to friendly suggestion prompts
+$intentPrompts = [
+    'network_scan'          => 'Run a network scan?',
+    'jellyfin_now_playing'  => 'Check what\'s playing on Jellyfin?',
+    'jellyfin_library'      => 'Check the Jellyfin library?',
+    'ha_scene'              => 'Activate a home scene?',
+    'planner:briefing'      => 'Get your daily briefing?',
+    'vm_suggestions'        => 'Check VM resource usage?',
+    'jellyfin_pause'        => 'Pause Jellyfin?',
+    'focus_mode'            => 'Switch to focus mode?',
+    'show_panels'           => 'Show all panels?',
+];
+
+$suggestions = [];
+foreach ($rows as $r) {
+    $intent = $r['intent_name'];
+    if (isset($intentPrompts[$intent])) {
+        $suggestions[] = [
+            'intent'    => $intent,
+            'prompt'    => $intentPrompts[$intent],
+            'hit_count' => (int)$r['hit_count'],
+        ];
+    }
+}
+
+echo json_encode(['suggestions' => $suggestions, 'hour' => $hour, 'dow' => $dow]);