fix(desktop): declare minimum Rust version 1.88

Author: rubencu

packages/desktop/README.md

@@ -4,7 +4,7 @@ Native OpenCode desktop app, built with Tauri v2.
 
 ## Prerequisites
 
-Building the desktop app requires additional Tauri dependencies (Rust toolchain, platform-specific libraries). See the [Tauri prerequisites](https://v2.tauri.app/start/prerequisites/) for setup instructions.
+Building the desktop app requires additional Tauri dependencies (Rust toolchain, platform-specific libraries). The desktop crate currently requires Rust 1.88 or newer. See the [Tauri prerequisites](https://v2.tauri.app/start/prerequisites/) for setup instructions.
 
 ## Development
 
@@ -30,3 +30,9 @@ If you see errors about Rust not being found, install it via [rustup](https://ru
 ```bash
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
 ```
+
+If Cargo reports that the desktop crate requires a newer compiler, update Rust with:
+
+```bash
+rustup update
+```

packages/desktop/src-tauri/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "The open source AI coding agent"
 authors = ["Anomaly Innovations"]
 edition = "2024"
+rust-version = "1.88"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html