test: remove outdated tests for deprecated custom UI flags

Remove tests for legacy individual flags (--login-title, --password-placeholder, --submit-text, etc.) that have been replaced by the unified --custom-strings flag. Also remove cleanup of non-existent environment variables in CLI tests.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: strickvl

test/unit/node/cli.test.ts

@@ -49,10 +49,6 @@ describe("parser", () => {
     delete process.env.CS_DISABLE_GETTING_STARTED_OVERRIDE
     delete process.env.VSCODE_PROXY_URI
     delete process.env.CS_DISABLE_PROXY
-    delete process.env.CS_LOGIN_TITLE
-    delete process.env.CS_LOGIN_ENV_PASSWORD_MSG
-    delete process.env.CS_PASSWORD_PLACEHOLDER
-    delete process.env.CS_SUBMIT_TEXT
     console.log = jest.fn()
   })
 

test/unit/node/routes/login.test.ts

@@ -147,69 +147,5 @@ describe("login", () => {
       expect(htmlContent).toContain(`欢迎来到 code-server`)
     })
 
-    it("should return custom login title", async () => {
-      process.env.PASSWORD = previousEnvPassword
-      const loginTitle = "Custom Access Portal"
-      const codeServer = await integration.setup([`--login-title=${loginTitle}`], "")
-      const resp = await codeServer.fetch("/login", { method: "GET" })
-
-      const htmlContent = await resp.text()
-      expect(resp.status).toBe(200)
-      expect(htmlContent).toContain(`<title>${loginTitle}</title>`)
-    })
-
-    it("should return custom password placeholder", async () => {
-      process.env.PASSWORD = previousEnvPassword
-      const placeholder = "Enter access code"
-      const codeServer = await integration.setup([`--password-placeholder=${placeholder}`], "")
-      const resp = await codeServer.fetch("/login", { method: "GET" })
-
-      const htmlContent = await resp.text()
-      expect(resp.status).toBe(200)
-      expect(htmlContent).toContain(`placeholder="${placeholder}"`)
-    })
-
-    it("should return custom submit button text", async () => {
-      process.env.PASSWORD = previousEnvPassword
-      const submitText = "ACCESS PORTAL"
-      const codeServer = await integration.setup([`--submit-text=${submitText}`], "")
-      const resp = await codeServer.fetch("/login", { method: "GET" })
-
-      const htmlContent = await resp.text()
-      expect(resp.status).toBe(200)
-      expect(htmlContent).toContain(`value="${submitText}"`)
-    })
-
-    it("should return custom env password message", async () => {
-      const envMessage = "Password configured via container environment"
-      const codeServer = await integration.setup([`--login-env-password-msg=${envMessage}`, `--password=test123`], "")
-      const resp = await codeServer.fetch("/login", { method: "GET" })
-
-      const htmlContent = await resp.text()
-      expect(resp.status).toBe(200)
-      expect(htmlContent).toContain(envMessage)
-    })
-
-    it("should escape HTML in custom messages", async () => {
-      process.env.PASSWORD = previousEnvPassword
-      const maliciousTitle = "<script>alert('xss')</script>"
-      const codeServer = await integration.setup([`--login-title=${maliciousTitle}`, `--password=test123`], "")
-      const resp = await codeServer.fetch("/login", { method: "GET" })
-
-      const htmlContent = await resp.text()
-      expect(resp.status).toBe(200)
-      expect(htmlContent).toContain("&lt;script&gt;alert(&apos;xss&apos;)&lt;/script&gt;")
-      expect(htmlContent).not.toContain("<script>alert('xss')</script>")
-    })
-
-    it("should return custom error messages", async () => {
-      const customMissingMsg = "Access code required"
-      const codeServer = await integration.setup([`--missing-password-msg=${customMissingMsg}`, `--password=test123`], "")
-      const resp = await codeServer.fetch("/login", { method: "POST" })
-
-      const htmlContent = await resp.text()
-      expect(resp.status).toBe(200)
-      expect(htmlContent).toContain(customMissingMsg)
-    })
   })
 })