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

node_modules/pngjs/coverage/lcov-report/block-navigation.js

@@ -0,0 +1,77 @@
+/* eslint-disable */
+var jumpToCode = (function init() {
+  // Classes of code we would like to highlight in the file view
+  var missingCoverageClasses = [".cbranch-no", ".cstat-no", ".fstat-no"];
+
+  // Elements to highlight in the file listing view
+  var fileListingElements = ["td.pct.low"];
+
+  // We don't want to select elements that are direct descendants of another match
+  var notSelector = ":not(" + missingCoverageClasses.join("):not(") + ") > "; // becomes `:not(a):not(b) > `
+
+  // Selecter that finds elements on the page to which we can jump
+  var selector =
+    fileListingElements.join(", ") +
+    ", " +
+    notSelector +
+    missingCoverageClasses.join(", " + notSelector); // becomes `:not(a):not(b) > a, :not(a):not(b) > b`
+
+  // The NodeList of matching elements
+  var missingCoverageElements = document.querySelectorAll(selector);
+
+  var currentIndex;
+
+  function toggleClass(index) {
+    missingCoverageElements.item(currentIndex).classList.remove("highlighted");
+    missingCoverageElements.item(index).classList.add("highlighted");
+  }
+
+  function makeCurrent(index) {
+    toggleClass(index);
+    currentIndex = index;
+    missingCoverageElements.item(index).scrollIntoView({
+      behavior: "smooth",
+      block: "center",
+      inline: "center",
+    });
+  }
+
+  function goToPrevious() {
+    var nextIndex = 0;
+    if (typeof currentIndex !== "number" || currentIndex === 0) {
+      nextIndex = missingCoverageElements.length - 1;
+    } else if (missingCoverageElements.length > 1) {
+      nextIndex = currentIndex - 1;
+    }
+
+    makeCurrent(nextIndex);
+  }
+
+  function goToNext() {
+    var nextIndex = 0;
+
+    if (
+      typeof currentIndex === "number" &&
+      currentIndex < missingCoverageElements.length - 1
+    ) {
+      nextIndex = currentIndex + 1;
+    }
+
+    makeCurrent(nextIndex);
+  }
+
+  return function jump(event) {
+    switch (event.which) {
+      case 78: // n
+      case 74: // j
+        goToNext();
+        break;
+      case 66: // b
+      case 75: // k
+      case 80: // p
+        goToPrevious();
+        break;
+    }
+  };
+})();
+window.addEventListener("keydown", jumpToCode);