Add chromium compatibility backend with per-app profiles

README.md

@@ -91,6 +91,7 @@ flowchart TD
 
 - Requires Tauri/Linux system dependencies to be installed locally before `deskify build`
 - Generated app build success can vary by distro/system setup (WebKitGTK/Tauri prerequisites)
+- Some modern sites fail or degrade in the system WebView backend (`tauri`) due to engine/runtime differences
 - No official cross-platform support (Windows/macOS) yet
 - GitHub Releases / binary automation for `deskify` itself may lag behind source updates during early MVP
 - DRM/protected-media services may not work reliably in the system WebView backend even if they work in a full browser (depends on WebView/DRM support)
@@ -211,11 +212,20 @@ Once the build finishes, `ChatGPT` will instantly appear in your system Applicat
 
 `deskify` derives a safe internal ID from the app name (for example, `ChatGPT` becomes `chatgpt`).
 
+### Backend Modes (`--backend`)
+
+Deskify supports two backend modes:
+
+- `tauri` (default): Uses the system WebView (`webkit2gtk` on Linux). Produces small wrappers and strong Linux desktop integration, but some sites may fail due to engine compatibility.
+- `chromium`: Uses an already installed Chromium-based browser (`chromium`, `google-chrome`, `brave`, etc.) in app mode. Better site compatibility and no local Tauri build, but depends on a browser installed on the system.
+
+If a site does not work in the default `tauri` backend, try `--backend chromium`.
+
 #### Advanced Build Options
 ```bash
 deskify build \
-  --url "https://web.whatsapp.com" \
-  --name "WhatsApp" \
+  --url "https://example.com/dashboard" \
+  --name "Dashboard" \
   --fullscreen \
   --user-agent "Mozilla/5.0 (Windows NT 10.0; Win64; x64) Chrome/120.0.0.0 Safari/537.36" \
   --dark-mode \
@@ -240,6 +250,32 @@ Preview the generated Tauri config without building/installing:
 deskify build --url "https://chat.com" --name "Chat" --print-config
 ```
 
+Chromium compatibility mode (no local Tauri build):
+
+```bash
+deskify build --url "https://mail.proton.me" --name "Proton Mail" --backend chromium
+```
+
+Chromium with shared browser profile (uses existing browser profile/session model):
+
+```bash
+deskify build \
+  --url "https://app.slack.com" \
+  --name "Slack" \
+  --backend chromium \
+  --profile-scope shared
+```
+
+Chromium with explicit browser binary:
+
+```bash
+deskify build \
+  --url "https://github.com" \
+  --name "GitHub" \
+  --backend chromium \
+  --browser-bin /usr/bin/brave-browser
+```
+
 Preview planned actions only (dry run):
 
 ```bash
@@ -252,9 +288,17 @@ deskify build --url "https://chat.com" --name "Chat" --dry-run
 * `--user-agent <UA>`: Useful to bypass webview restrictions on certain platforms.
 * `--dark-mode`: Forces the Tauri webview into a dark theme.
 * `--width <PX>` / `--height <PX>`: Sets the startup resolution.
+* `--backend <tauri|chromium>`: Choose system WebView (`tauri`) or Chromium app mode (`chromium`).
+* `--browser-bin <PATH>`: Use a specific Chromium-based browser binary (Chromium backend only).
+* `--profile-scope <isolated|shared>`: Chromium backend profile behavior (`isolated` creates a per-app profile under `~/.local/share/deskify/profiles/`).
 * `--print-config`: Prints the generated `tauri.conf.json` and exits.
 * `--dry-run`: Shows planned actions without building/installing.
 
+Note for Chromium backend:
+
+- `--no-decorations` is best-effort and may be ignored by the browser/window manager.
+- `--width` and `--height` are applied together (`--window-size`) only when both are provided.
+
 ### Managing Apps (`list` & `remove`)
 You can view all applications generated by `deskify`:
 ```bash
@@ -284,6 +328,7 @@ deskify update chat --url "https://chat.com" --name "Chat" --no-decorations
 ```
 
 Alpha note: `update` currently requires `--url` because Deskify does not persist app URLs/config metadata yet.
+`update <id>` keeps the existing internal ID stable even if you change the display name.
 
 You can also preview an update:
 
@@ -300,6 +345,8 @@ Check local prerequisites and common environment issues (Rust/Cargo, `cargo taur
 deskify doctor
 ```
 
+`doctor` also checks whether a Chromium-based browser is available in `PATH` for `--backend chromium`.
+
 ---
 
 ## 🧪 Manual Smoke Test Checklist (Before a Public Release)