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/which-module/README.md

@@ -0,0 +1,58 @@
+# which-module
+
+> Find the module object for something that was require()d
+
+[![Build Status](https://travis-ci.org/nexdrew/which-module.svg?branch=master)](https://travis-ci.org/nexdrew/which-module)
+[![Coverage Status](https://coveralls.io/repos/github/nexdrew/which-module/badge.svg?branch=master)](https://coveralls.io/github/nexdrew/which-module?branch=master)
+[![Standard Version](https://img.shields.io/badge/release-standard%20version-brightgreen.svg)](https://github.com/conventional-changelog/standard-version)
+[![Greenkeeper badge](https://badges.greenkeeper.io/nexdrew/which-module.svg)](https://greenkeeper.io/)
+
+Find the `module` object in `require.cache` for something that was `require()`d
+or `import`ed - essentially a reverse `require()` lookup.
+
+Useful for libs that want to e.g. lookup a filename for a module or submodule
+that it did not `require()` itself.
+
+## Install and Usage
+
+```
+npm install --save which-module
+```
+
+```js
+const whichModule = require('which-module')
+
+console.log(whichModule(require('something')))
+// Module {
+//   id: '/path/to/project/node_modules/something/index.js',
+//   exports: [Function],
+//   parent: ...,
+//   filename: '/path/to/project/node_modules/something/index.js',
+//   loaded: true,
+//   children: [],
+//   paths: [ '/path/to/project/node_modules/something/node_modules',
+//            '/path/to/project/node_modules',
+//            '/path/to/node_modules',
+//            '/path/node_modules',
+//            '/node_modules' ] }
+```
+
+## API
+
+### `whichModule(exported)`
+
+Return the [`module` object](https://nodejs.org/api/modules.html#modules_the_module_object),
+if any, that represents the given argument in the `require.cache`.
+
+`exported` can be anything that was previously `require()`d or `import`ed as a
+module, submodule, or dependency - which means `exported` is identical to the
+`module.exports` returned by this method.
+
+If `exported` did not come from the `exports` of a `module` in `require.cache`,
+then this method returns `null`.
+
+## License
+
+ISC © Contributors
+
+[opensourceregistry_package_id]: # (458260416784685e5ef3091fee54001785dd4360406aa3000315ff256eef6878)