Fix lint: use nullish coalescing

Author: ammar-agent

src/utils/chatCommands.test.ts

@@ -48,7 +48,7 @@ describe("parseRuntimeString", () => {
   test("accepts SSH with hostname only (user will be inferred)", () => {
     const result = parseRuntimeString("ssh hostname", workspaceName);
     // When no user is specified, uses current user (process.env.USER)
-    const expectedUser = process.env.USER || "user";
+    const expectedUser = process.env.USER ?? "user";
     expect(result).toEqual({
       type: "ssh",
       host: "hostname",
@@ -59,7 +59,7 @@ describe("parseRuntimeString", () => {
   test("accepts SSH with hostname.domain only", () => {
     const result = parseRuntimeString("ssh dev.example.com", workspaceName);
     // When no user is specified, uses current user (process.env.USER)
-    const expectedUser = process.env.USER || "user";
+    const expectedUser = process.env.USER ?? "user";
     expect(result).toEqual({
       type: "ssh",
       host: "dev.example.com",

src/utils/chatCommands.ts

@@ -53,7 +53,7 @@ export function parseRuntimeString(
 
     // Extract username from user@host format, or default to current user
     const atIndex = hostPart.indexOf("@");
-    const user = atIndex > 0 ? hostPart.substring(0, atIndex) : process.env.USER || "user";
+    const user = atIndex > 0 ? hostPart.substring(0, atIndex) : process.env.USER ?? "user";
 
     // Accept both "hostname" and "user@hostname" formats
     // SSH will use current user or ~/.ssh/config if user not specified