fix: apply --app-name to web page titles

[jonathandunne]

Summary

• apply --app-name to VS Code web bootstrap product configuration
• set nameShort/nameLong so ${appName} in tab titles uses the configured app name
• add a focused route test covering the injected configuration

Testing

• attempted npm install (partially completed but failed in lib/vscode on missing gssapi/gssapi.h for kerberos under Node 24)
• attempted npm run test:unit -- --runInBand --runTestsByPath test/unit/node/routes/vscode.test.ts test/unit/node/routes/login.test.ts
• test run was blocked by a pre-existing TypeScript error in src/node/http.ts (auth.cookie-max-age missing on DefaultedArgs) before these route tests executed