Add AMS humidity/temperature indicators with configurable thresholds

- Add dynamic humidity indicator with Bambu Lab style water drop icons
    - Empty drop for good (dry), half-filled for fair, full for bad (wet)
    - Configurable thresholds via Settings page

  - Add dynamic temperature indicator with thermometer icons
    - Empty for good, half-filled for fair, full for hot
    - Colors match humidity: green/gold/red

  - Add AMS Display Thresholds settings card
    - Humidity thresholds (good/fair) configurable
    - Temperature thresholds (good/fair) configurable
    - Persisted in backend settings

  - Fix AMS card stability issues
    - Add ams_extruder_map to WebSocket broadcasts
    - Cache AMS data and extruder map to prevent bouncing
    - Fix L/R nozzle indicator for dual-nozzle H2 printers

  - Fix status summary bar counting
    - Don't count printers with unknown status as offline

  - Theme-aware L/R nozzle badges (light/dark theme support)

static/index.html

@@ -7,8 +7,8 @@
     <link rel="icon" type="image/png" sizes="32x32" href="/img/favicon-32x32.png" />
     <link rel="icon" type="image/png" sizes="16x16" href="/img/favicon-16x16.png" />
     <link rel="apple-touch-icon" sizes="180x180" href="/img/apple-touch-icon.png" />
-    <script type="module" crossorigin src="/assets/index-DzQp7Kty.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-SGO6jLr2.css">
+    <script type="module" crossorigin src="/assets/index-CUSzovgk.js"></script>
+    <link rel="stylesheet" crossorigin href="/assets/index-DL3S7zom.css">
   </head>
   <body>
     <div id="root"></div>