feat: Enhance installation commands with no-hint option and update ne…

[roble]

This pull request improves the install and stack selection flows by refining how and when the user is reminded to run npm install. It introduces a new --no-hint option to suppress duplicate reminders during automated or chained commands, and updates user messaging for clarity.

User messaging improvements:

• Added a line in NewCommand to clarify that setup continues and the final summary contains the real next steps.
• Ensured the final "next steps" summary always includes a reminder to install frontend dependencies with npm install.

Stack command enhancements:

• Added a new --no-hint option to StackCommand to allow suppression of the npm install reminder when invoked from other commands (e.g., during install).
• Updated the stack selection logic to conditionally show or suppress the npm install reminder based on the --no-hint option.
• Modified InstallCommand to always pass --no-hint when invoking the stack command, preventing duplicate npm install reminders during the install flow.