PAB-66: fix piped interactive installs

[pablopunk]

Title: Fix piped interactive installs

This pull request fixes a bug where running dot in interactive mode with piped input (e.g., echo "..." | dot) would fail because the standard input was not a terminal. The changes ensure interactive prompts are still displayed and read from the real terminal even when stdin is redirected or piped. Additionally, non-interactive install commands are now executed with their standard input explicitly ignored, preventing them from accidentally consuming the parent’s piped data.

Major changes include:

• Added a openTerminalInput utility that opens /dev/tty to provide a terminal-backed input stream when process.stdin is not a TTY.
• Updated the interactive mode to fall back to the terminal stream if stdin is not a TTY, and to use that stream for the prompts checklist.
• Refactored command execution in installComponent and uninstallComponent to use Bun.spawn with stdin: "ignore" instead of appending < /dev/null to shell commands, avoiding unintended side effects with piped input.
• Added new tests covering both interactive and non-interactive scenarios to validate the fix.

This ensures dot behaves correctly in complex shell pipelines, whether running an interactive setup or executing automated installs.

[kody-ai]

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