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/require-main-filename/CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
+
+<a name="2.0.0"></a>
+# [2.0.0](https://github.com/yargs/require-main-filename/compare/v1.0.2...v2.0.0) (2019-01-28)
+
+
+### Chores
+
+* drop support for Node 0.10 ([#11](https://github.com/yargs/require-main-filename/issues/11)) ([87f4e13](https://github.com/yargs/require-main-filename/commit/87f4e13))
+
+
+### BREAKING CHANGES
+
+* drop support for Node 0.10/0.12
+
+
+
+<a name="1.0.2"></a>
+## [1.0.2](https://github.com/yargs/require-main-filename/compare/v1.0.1...v1.0.2) (2017-06-16)
+
+
+### Bug Fixes
+
+* add files to package.json ([#4](https://github.com/yargs/require-main-filename/issues/4)) ([fa29988](https://github.com/yargs/require-main-filename/commit/fa29988))

node_modules/require-main-filename/LICENSE.txt

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+Copyright (c) 2016, Contributors
+
+Permission to use, copy, modify, and/or distribute this software
+for any purpose with or without fee is hereby granted, provided
+that the above copyright notice and this permission notice
+appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE
+LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
+OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

node_modules/require-main-filename/README.md

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+# require-main-filename
+
+[![Build Status](https://travis-ci.org/yargs/require-main-filename.png)](https://travis-ci.org/yargs/require-main-filename)
+[![Coverage Status](https://coveralls.io/repos/yargs/require-main-filename/badge.svg?branch=master)](https://coveralls.io/r/yargs/require-main-filename?branch=master)
+[![NPM version](https://img.shields.io/npm/v/require-main-filename.svg)](https://www.npmjs.com/package/require-main-filename)
+
+`require.main.filename` is great for figuring out the entry
+point for the current application. This can be combined with a module like
+[pkg-conf](https://www.npmjs.com/package/pkg-conf) to, _as if by magic_, load
+top-level configuration.
+
+Unfortunately, `require.main.filename` sometimes fails when an application is
+executed with an alternative process manager, e.g., [iisnode](https://github.com/tjanczuk/iisnode).
+
+`require-main-filename` is a shim that addresses this problem.
+
+## Usage
+
+```js
+var main = require('require-main-filename')()
+// use main as an alternative to require.main.filename.
+```
+
+## License
+
+ISC

node_modules/require-main-filename/index.js

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+module.exports = function (_require) {
+  _require = _require || require
+  var main = _require.main
+  if (main && isIISNode(main)) return handleIISNode(main)
+  else return main ? main.filename : process.cwd()
+}
+
+function isIISNode (main) {
+  return /\\iisnode\\/.test(main.filename)
+}
+
+function handleIISNode (main) {
+  if (!main.children.length) {
+    return main.filename
+  } else {
+    return main.children[0].filename
+  }
+}

node_modules/require-main-filename/package.json

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+{
+  "name": "require-main-filename",
+  "version": "2.0.0",
+  "description": "shim for require.main.filename() that works in as many environments as possible",
+  "main": "index.js",
+  "scripts": {
+    "pretest": "standard",
+    "test": "tap --coverage test.js",
+    "release": "standard-version"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+ssh://git@github.com/yargs/require-main-filename.git"
+  },
+  "keywords": [
+    "require",
+    "shim",
+    "iisnode"
+  ],
+  "files": [
+    "index.js"
+  ],
+  "author": "Ben Coe <ben@npmjs.com>",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/yargs/require-main-filename/issues"
+  },
+  "homepage": "https://github.com/yargs/require-main-filename#readme",
+  "devDependencies": {
+    "chai": "^4.0.0",
+    "standard": "^10.0.3",
+    "standard-version": "^4.0.0",
+    "tap": "^11.0.0"
+  }
+}