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/locate-path/index.d.ts

@@ -0,0 +1,83 @@
+declare namespace locatePath {
+	interface Options {
+		/**
+		Current working directory.
+
+		@default process.cwd()
+		*/
+		readonly cwd?: string;
+
+		/**
+		Type of path to match.
+
+		@default 'file'
+		*/
+		readonly type?: 'file' | 'directory';
+
+		/**
+		Allow symbolic links to match if they point to the requested path type.
+
+		@default true
+		*/
+		readonly allowSymlinks?: boolean;
+	}
+
+	interface AsyncOptions extends Options {
+		/**
+		Number of concurrently pending promises. Minimum: `1`.
+
+		@default Infinity
+		*/
+		readonly concurrency?: number;
+
+		/**
+		Preserve `paths` order when searching.
+
+		Disable this to improve performance if you don't care about the order.
+
+		@default true
+		*/
+		readonly preserveOrder?: boolean;
+	}
+}
+
+declare const locatePath: {
+	/**
+	Get the first path that exists on disk of multiple paths.
+
+	@param paths - Paths to check.
+	@returns The first path that exists or `undefined` if none exists.
+
+	@example
+	```
+	import locatePath = require('locate-path');
+
+	const files = [
+		'unicorn.png',
+		'rainbow.png', // Only this one actually exists on disk
+		'pony.png'
+	];
+
+	(async () => {
+		console(await locatePath(files));
+		//=> 'rainbow'
+	})();
+	```
+	*/
+	(paths: Iterable<string>, options?: locatePath.AsyncOptions): Promise<
+		string | undefined
+	>;
+
+	/**
+	Synchronously get the first path that exists on disk of multiple paths.
+
+	@param paths - Paths to check.
+	@returns The first path that exists or `undefined` if none exists.
+	*/
+	sync(
+		paths: Iterable<string>,
+		options?: locatePath.Options
+	): string | undefined;
+};
+
+export = locatePath;