docs: rewrite README to match current architecture

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -1,73 +1,58 @@
-# React + TypeScript + Vite
+# Fabric.Frontend
 
-This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
+The Fabric **web client** — React 19 + TypeScript + Vite. This is the actual
+UI; it is served on the web and **bundled unchanged** into `Fabric.Desktop`
+(Electron) and `Fabric.Android` (Capacitor).
 
-Currently, two official plugins are available:
+## What it does
 
-- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Oxc](https://oxc.rs)
+- **Auth** — login screen with a configurable Center API base
-- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/)
+  (default `http://localhost:7001/api`); discovers the user's guilds and
+  short-lived guild access tokens; refreshes on mount.
+- **Discord-style dark UI** — server rail / channel sidebar / messages /
+  members layout; per-`x_type` channel colors + badges.
+- **Messaging** — per-message Markdown render (HTML-escaped, XSS-safe, no
+  cross-message bleed), `<@id>` mention chips (resolved to display names,
+  backtick-aware), no message length cap.
+- **Channels** — create-channel modal (required Type, Public, members,
+  triage on-duty, custom listeners, discuss/work **bypass** multi-select);
+  join/leave; closed-channel read-only banner.
+- **Members** — split "In channel" / "Guild" panels for non-public channels;
+  discuss/work bypass tag + "→ bypass" action.
+- **Files** — composer attach (multi-file) with chips; image previews /
+  download chips (via `?access_token`).
+- **Canvas** — pinned per-channel document panel (Markdown / sandboxed HTML
+  iframe / plain text), live via `canvas.*` sockets; sharer-only edit/remove.
+- **Right-click menus** — native menu overridden with resource-specific
+  context menus (guild / channel / message / user / blank areas).
+- **Dev mode** — surfaces guild `/ack` and per-message `wakeup` metadata
+  (off by default; persisted in `localStorage`).
+- Routing is `BrowserRouter` on the web and `HashRouter` under `file://`
+  (the Electron bundle); Capacitor serves over `http://localhost` so it
+  uses `BrowserRouter`.
 
-## React Compiler
+## Develop
 
-The React Compiler is not enabled on this template because of its impact on dev & build performances. To add it, see [this documentation](https://react.dev/learn/react-compiler/installation).
+```bash
-
+npm install
-## Expanding the ESLint configuration
+npm run dev          # Vite dev server (http://localhost:5173)
-
-If you are developing a production application, we recommend updating the configuration to enable type-aware lint rules:
-
-```js
-export default defineConfig([
-  globalIgnores(['dist']),
-  {
-    files: ['**/*.{ts,tsx}'],
-    extends: [
-      // Other configs...
-
-      // Remove tseslint.configs.recommended and replace with this
-      tseslint.configs.recommendedTypeChecked,
-      // Alternatively, use this for stricter rules
-      tseslint.configs.strictTypeChecked,
-      // Optionally, add this for stylistic rules
-      tseslint.configs.stylisticTypeChecked,
-
-      // Other configs...
-    ],
-    languageOptions: {
-      parserOptions: {
-        project: ['./tsconfig.node.json', './tsconfig.app.json'],
-        tsconfigRootDir: import.meta.dirname,
-      },
-      // other options...
-    },
-  },
-])
 ```
 
-You can also install [eslint-plugin-react-x](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-x) and [eslint-plugin-react-dom](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-dom) for React-specific lint rules:
+## Build
 
-```js
+```bash
-// eslint.config.js
+npm run build          # web build (absolute base) -> dist/
-import reactX from 'eslint-plugin-react-x'
+npm run build:desktop  # relative-base build -> dist-desktop/  (Electron, file://)
-import reactDom from 'eslint-plugin-react-dom'
-
-export default defineConfig([
-  globalIgnores(['dist']),
-  {
-    files: ['**/*.{ts,tsx}'],
-    extends: [
-      // Other configs...
-      // Enable lint rules for React
-      reactX.configs['recommended-typescript'],
-      // Enable lint rules for React DOM
-      reactDom.configs.recommended,
-    ],
-    languageOptions: {
-      parserOptions: {
-        project: ['./tsconfig.node.json', './tsconfig.app.json'],
-        tsconfigRootDir: import.meta.dirname,
-      },
-      // other options...
-    },
-  },
-])
 ```
+
+`Fabric.Desktop` / `Fabric.Android` run their own scripts that invoke these
+builds and copy the output into their shells — you normally don't build for
+them by hand.
+
+## Notes
+
+- ES modules, Vite. App icons / favicon use the Fabric mark
+  (`public/favicon.svg` is a vectorized, deep-green version; PNG fallbacks +
+  `apple-touch-icon`). Favicon hrefs are versioned (`?v=`) for cache-busting.
+- The Center API base is entered at login, so desktop/mobile builds (no web
+  origin) just point at the right backend host.