fix: resolve backend build errors, preserve sudo file read buffers, and format code (#798)

* fix: resolve backend TypeScript build errors and preserve sudo file read buffers

* style: format code

* fix: ssh2 ESM import failure

---------

Co-authored-by: LukeGus <bugattiguy527@gmail.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

src/backend/ssh/tmux-helper.ts

@@ -124,7 +124,10 @@ export async function waitForTmuxSession(
   const deadline = Date.now() + timeoutMs;
   while (Date.now() < deadline) {
     try {
-      await execCommand(conn, `tmux has-session -t ${shellEscape(sessionName)} 2>/dev/null`);
+      await execCommand(
+        conn,
+        `tmux has-session -t ${shellEscape(sessionName)} 2>/dev/null`,
+      );
       return sessionName;
     } catch {
       // session not ready yet