Use login shell to start aish in sidecar pane to inherit proper PATH (#403)

On macOS, when using the sidecar experience, `aish` cannot start local MCP servers and the `Azure` agent cannot get the access token from Az CLI.

This is due to the PATH environment variable not properly setup when iTerm2 starts `"aish --Channel ..."` in the new pane. iTerm2 uses `exec` to run the `aish` command, which directly execute the program without setting up the environment variables properly.

Because of that, the `az` and `pwsh` commands cannot be found when retrieving access token, and the MCP server commands cannot be found too, which caused local MCP servers to always fail to start.

The fix is to wrap it with `zsh` by `/bin/zsh -l -c "<aish-path> --channel <channel-string>"`. In this way, `zsh` will set up the environment properly, which will then be inherited by `aish`.

Author: daxian-dbw

shell/AIShell.Integration/InitAndCleanup.cs

@@ -7,7 +7,7 @@ namespace AIShell.Integration;
 
 public class InitAndCleanup : IModuleAssemblyInitializer, IModuleAssemblyCleanup
 {
-    private const int ScriptVersion = 1;
+    private const int ScriptVersion = 2;
     private const string ScriptFileTemplate = "aish_split_pane_v{0}.py";
     private const string SplitPanePythonCode = """
         import iterm2
@@ -31,7 +31,8 @@ await app.async_activate()
 
                 change = iterm2.LocalWriteOnlyProfile()
                 change.set_use_custom_command('Yes')
-                change.set_command(f'{app_path} --channel {channel}')
+                # Use login shell to inherit proper PATH and environment
+                change.set_command(f'/bin/zsh -l -c "{app_path} --channel {channel}"')
 
                 # Split pane vertically
                 split_pane = await current_pane.async_split_pane(vertical=True, profile_customizations=change)