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/yargs/build/lib/process-argv.js

@@ -0,0 +1,31 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.getProcessArgvBin = exports.getProcessArgvWithoutBin = void 0;
+function getProcessArgvBinIndex() {
+    // The binary name is the first command line argument for:
+    // - bundled Electron apps: bin argv1 argv2 ... argvn
+    if (isBundledElectronApp())
+        return 0;
+    // or the second one (default) for:
+    // - standard node apps: node bin.js argv1 argv2 ... argvn
+    // - unbundled Electron apps: electron bin.js argv1 arg2 ... argvn
+    return 1;
+}
+function isBundledElectronApp() {
+    // process.defaultApp is either set by electron in an electron unbundled app, or undefined
+    // see https://github.com/electron/electron/blob/master/docs/api/process.md#processdefaultapp-readonly
+    return isElectronApp() && !process.defaultApp;
+}
+function isElectronApp() {
+    // process.versions.electron is either set by electron, or undefined
+    // see https://github.com/electron/electron/blob/master/docs/api/process.md#processversionselectron-readonly
+    return !!process.versions.electron;
+}
+function getProcessArgvWithoutBin() {
+    return process.argv.slice(getProcessArgvBinIndex() + 1);
+}
+exports.getProcessArgvWithoutBin = getProcessArgvWithoutBin;
+function getProcessArgvBin() {
+    return process.argv[getProcessArgvBinIndex()];
+}
+exports.getProcessArgvBin = getProcessArgvBin;