feat(security,ui): self-host React deps, Tailwind, fonts; strict CSP; local QR; better selection state

Replace CDN React/ReactDOM/Babel with local libs; remove Babel and inline scripts
Build Tailwind locally, add safelist; switch to assets/tailwind.css
Self-host Font Awesome and Inter (CSS + woff2); remove external font CDNs
Implement strict CSP (no unsafe-inline/eval; scripts/styles/fonts from self)
Extract inline handlers; move PWA scripts to external files
Add local QR code generation (qrcode lib) and remove api.qrserver.com
Improve SessionTypeSelector visual selection (highlighted background and ring)
Keep PWA working with service worker and offline assets
Refs: CSP hardening, offline-first, no external dependencies

src/scripts/fa-check.js

@@ -0,0 +1,47 @@
+// Global logging and function settings
+window.DEBUG_MODE = true;
+
+// Fake function settings (for stability)
+window.DISABLE_FAKE_TRAFFIC = false; // Set true to disable fake messages
+window.DISABLE_DECOY_CHANNELS = false; // Set true to disable decoy channels
+
+// Enhanced icon loading fallback
+document.addEventListener('DOMContentLoaded', function () {
+  // Check if Font Awesome loaded properly
+  function checkFontAwesome() {
+    const testIcon = document.createElement('i');
+    testIcon.className = 'fas fa-shield-halved';
+    testIcon.style.position = 'absolute';
+    testIcon.style.left = '-9999px';
+    testIcon.style.visibility = 'hidden';
+    document.body.appendChild(testIcon);
+
+    const computedStyle = window.getComputedStyle(testIcon, '::before');
+    const content = computedStyle.content;
+    const fontFamily = computedStyle.fontFamily;
+
+    document.body.removeChild(testIcon);
+
+    if (!content || content === 'none' || content === 'normal' || (!fontFamily.includes('Font Awesome') && !fontFamily.includes('fa-solid'))) {
+      console.warn('Font Awesome not loaded properly, using fallback icons');
+      document.body.classList.add('fa-fallback');
+      return false;
+    }
+
+    if (window.DEBUG_MODE) {
+      console.log('Font Awesome loaded successfully');
+    }
+    return true;
+  }
+
+  if (!checkFontAwesome()) {
+    setTimeout(function () {
+      if (!checkFontAwesome()) {
+        console.warn('Font Awesome still not loaded, using fallback icons');
+        document.body.classList.add('fa-fallback');
+      }
+    }, 2000);
+  }
+});
+
+