Add OpenCode binary selection with version detection

- Add binary selector component with dropdown and validation
- Support custom OpenCode binary paths and system PATH binary
- Async version checking for all binaries when selector opens
- Store recent binaries with timestamps and version info
- Enhanced instance creation to use selected binary
- Improved storage system for binary preferences
- Fixed validation to handle system PATH binaries properly

electron/main/storage.ts

@@ -51,8 +51,8 @@ function invalidateConfigCache() {
 export function setupStorageIPC() {
   ensureDirectories()
 
-  ipcMain.handle("storage:getConfigPath", () => CONFIG_FILE)
-  ipcMain.handle("storage:getInstancesDir", () => INSTANCES_DIR)
+  ipcMain.handle("storage:getConfigPath", async () => CONFIG_FILE)
+  ipcMain.handle("storage:getInstancesDir", async () => INSTANCES_DIR)
 
   ipcMain.handle("storage:readConfigFile", async () => {
     try {