feat: Add Intelligent Dependency Conflict Analysis

[psywarrior1998]

This pull request introduces a critical safety feature that checks for potential dependency conflicts before performing any package upgrades. This prevents users from accidentally breaking their environment by upgrading a package that is required by another installed tool.

Key Changes:

• Pre-flight Conflict Check: Before the upgrade confirmation prompt, the tool now runs a pip install --dry-run command with all targeted packages.
• Warning Display: If pip detects any dependency conflicts during the dry run, the errors are parsed and displayed to the user in a high-visibility warning panel.
• Informed Confirmation: The user is explicitly asked if they still wish to proceed after being shown any potential conflicts.

Technical Implementation:

• A new function, check_for_conflicts, has been added to orchestrate the pip --dry-run simulation.
• The function captures stderr from the pip subprocess to detect and extract the conflict error block.
• Regular expressions are used to cleanly parse the relevant error messages.
• The main upgrade function was modified to call this check and conditionally display the warning Panel.

This approach leverages pip's own battle-tested dependency resolver instead of attempting to reinvent it, ensuring accuracy and reliability.