tui: use random free port and enable icon discovery by default

- Tauri app now automatically finds an available port instead of defaulting to 4096
- Icon discovery feature is now enabled by default in the Tauri app
- Prevents port conflicts when multiple OpenCode instances are running

packages/opencode/src/flag/flag.ts

@@ -14,6 +14,8 @@ export namespace Flag {
 
   // Experimental
   export const OPENCODE_EXPERIMENTAL = truthy("OPENCODE_EXPERIMENTAL")
+  export const OPENCODE_EXPERIMENTAL_ICON_DISCOVERY =
+    OPENCODE_EXPERIMENTAL || truthy("OPENCODE_EXPERIMENTAL_ICON_DISCOVERY")
   export const OPENCODE_EXPERIMENTAL_WATCHER = OPENCODE_EXPERIMENTAL || truthy("OPENCODE_EXPERIMENTAL_WATCHER")
   export const OPENCODE_EXPERIMENTAL_DISABLE_COPY_ON_SELECT = truthy("OPENCODE_EXPERIMENTAL_DISABLE_COPY_ON_SELECT")
   export const OPENCODE_ENABLE_EXA =

packages/opencode/src/project/project.ts

@@ -107,7 +107,7 @@ export namespace Project {
         await migrateFromGlobal(id, worktree)
       }
     }
-    if (Flag.OPENCODE_EXPERIMENTAL) discover(existing)
+    if (Flag.OPENCODE_EXPERIMENTAL_ICON_DISCOVERY) discover(existing)
     const result: Info = {
       ...existing,
       worktree,

packages/tauri/src-tauri/src/lib.rs

@@ -1,5 +1,5 @@
 use std::{
-    net::SocketAddr,
+    net::{SocketAddr, TcpListener},
     process::Command,
     sync::{Arc, Mutex},
     time::{Duration, Instant},
@@ -18,7 +18,13 @@ fn get_sidecar_port() -> u16 {
         .map(|s| s.to_string())
         .or_else(|| std::env::var("OPENCODE_PORT").ok())
         .and_then(|port_str| port_str.parse().ok())
-        .unwrap_or(4096)
+        .unwrap_or_else(|| {
+            TcpListener::bind("127.0.0.1:0")
+                .expect("Failed to bind to find free port")
+                .local_addr()
+                .expect("Failed to get local address")
+                .port()
+        })
 }
 
 fn find_and_kill_process_on_port(port: u16) -> Result<(), Box<dyn std::error::Error>> {
@@ -60,6 +66,7 @@ fn spawn_sidecar(app: &AppHandle, port: u16) -> CommandChild {
         .shell()
         .sidecar("opencode")
         .unwrap()
+        .env("OPENCODE_EXPERIMENTAL_ICON_DISCOVERY", "true")
         .args(["serve", &format!("--port={port}")])
         .spawn()
         .expect("Failed to spawn opencode");