feat: update project structure and enhance WebDAV integration with settings persistence and save status management

AGENTS.md

@@ -17,7 +17,9 @@
 ```
 src/
   app/
-    App.tsx               # Root component: routing, nav, layout
+    App.tsx               # Root component: routing, nav, layout, SaveStatusBadge
+    settings.ts           # useSettings() hook — load/save config.json via WebDAV
+    webdav.ts             # WebDAV abstraction (listDirectory, stat, put/get, etc.)
     components/
       StatusPage.tsx       # System status, activity log, file info, progress, overlays
       DevicesPage.tsx      # Device list
@@ -29,18 +31,23 @@ src/
       ToolsPage.tsx        # Tools
       SearchOverlay.tsx
       WiFiScanOverlay.tsx
-      FileBrowser.tsx
+      FileBrowser.tsx      # WebDAV file browser (file click = select, kebab menu)
       figma/               # Figma-generated components
       ui/                  # shadcn/Radix UI wrappers
+    vendor/
+      webdav-component/    # Vendored ESM WebDAV client (no external deps)
+        esm/index.js
+        package.json
   imports/
     logo.svg
-    config.json            # Device config data shape
+    # config.json removed — config now loaded at runtime from /.sys/config.json
   main.tsx
   styles/
 public/
   manifest.webmanifest
   icon.192.png / icon.512.png
   service-worker.js        # PWA service worker
+webdav3.py                 # Dev Python WebDAV server (port 80, serves files/)
 index.html
 vite.config.ts
 ```
@@ -83,13 +90,40 @@ All individual app pages are currently stubs (`AppPage` component with "coming s
 8. **PWA support** — added `manifest.webmanifest`, service worker, PWA icons (`icon.192.png`, `icon.512.png`)
 9. **Vite base path** — set `base: process.env.BASE_PATH || '/config/'` in `vite.config.ts`
 10. **Icon/manifest path fix** — updated icon paths in manifest and HTML; adjusted service worker registration
+11. **WebDAV client** — replaced `webdav@5` npm package with vendored `webdav-component` (browser-native `fetch` + `DOMParser`, no external deps). All pages import from `webdav.ts` abstraction layer.
+12. **WebDAV path fixes** — `webdav.ts`: always `decodeURIComponent` paths; use `entry.uri` (not broken `entry.path`) for servers returning relative hrefs
+13. **`webdav3.py` server fixes** — `displayname` now returns leaf name only (not full path); PROPFIND depth-1 guard prevents crash when called on a file
+14. **FileBrowser redesign** — file click = `onSelect` + close; folder click = navigate; per-row kebab (`MoreVert`) opens a Dialog with contextual actions; permanent "Select Folder" button in footer; no mode-toggle buttons
+15. **Settings persistence** — `settings.ts` + `useSettings()` hook: loads `/.sys/config.json` via WebDAV on mount, auto-saves 3 s after last change, exposes `saveStatus` / `pendingCount` / `flushNow`; `beforeunload` flushes via `fetch keepalive`
+16. **Save-status badge** — `SaveStatusBadge` in `App.tsx` header shows: idle (hidden), loading spinner, amber "N unsaved + Save button", saving spinner, saved checkmark, red error + retry
 
 ## Known Issues / Open Work
 
-- **Service worker 404**: `https://meatloaf.cc/service-worker.js` returns 404. The SW is likely not being copied to the dist output at the correct path, or the registration URL does not account for the `/config/` base path.
+- **Service worker 404**: `https://meatloaf.cc/service-worker.js` returns 404. The SW is not being served at the correct path relative to the `/config/` base.
 - **App pages**: All individual app pages (Directory Editor, Sector Editor, etc.) are stubs. Actual implementations are pending.
-- **`apple-mobile-web-app-capable` deprecation**: Already resolved in `index.html` (uses `mobile-web-app-capable` instead).
 
 ## Configuration Shape
 
-Config is loaded from `src/imports/config.json` and passed as props (`config`, `setConfig`) to all page components.
+Config is stored at `files/.sys/config.json` on the device and loaded at runtime via WebDAV. Top-level keys: `general`, `host`, `hardware`, `wifi`, `network`, `bluetooth`, `modem`, `cassette`, `iec`, `boip`. The `useSettings()` hook in `settings.ts` provides `config` / `setConfig` to all page components (passed as props from `App.tsx`).
+
+## WebDAV Layer
+
+All WebDAV I/O goes through `src/app/webdav.ts`:
+
+| Export | Purpose |
+|---|---|
+| `getWebDAVClient()` | Returns (or creates) the singleton `WebDAVManager` pointed at `window.location.hostname` |
+| `listDirectory(path)` | PROPFIND depth-1, returns `EntryInfo[]` (filters self-entry + non-direct-children) |
+| `stat(path)` | PROPFIND depth-0, returns `EntryInfo \| null` |
+| `putFileContents(path, data)` | PUT |
+| `getFileContents(path)` | GET → `string` |
+| `createFolder(path)` | MKCOL |
+| `deletePath(path)` | DELETE |
+| `movePath(from, to)` | MOVE |
+| `fileExists(path)` | HEAD |
+| `humanFileSize(bytes)` | Formatting helper |
+| `normalizePath` / `splitPath` / `joinPath` / `basename` | Path utilities |
+
+`EntryInfo`: `{ name, path, type: 'folder'\|'file', size, lastModified, contentType }`
+
+The vendored `webdav-component` lives at `src/app/vendor/webdav-component/esm/index.js`. Known quirk: `entry.path` is broken for servers that return relative hrefs — always use `entry.uri` in the wrapper.