[Feature Request] Add extension column and time display to file list

Is your feature request related to a problem? Please describe.
I'm always frustrated when working with file lists because I can't sort or identify files by their extension separately from the filename. The current "name" column combines both the filename and extension, which makes it difficult to quickly see file types at a glance or sort by extension. Additionally, the date column only shows the date without time information, making it hard to distinguish between files modified on the same day.

Describe the solution you'd like
I would like to see two improvements to the file panel columns:

1. Separate Extension Column: Add an optional "extension" column that displays only the file extension (e.g., .js, .txt, .jpg). This would allow users to sort files by extension independently from the filename, similar to how Double Commander and other file managers handle this.

2. Date Column with Time: Enhance the existing date column to include time information (e.g., 2026-09-01 14:30:25 or a configurable format). This would help identify which files were modified most recently within the same day.

Additional context
I'm running Cloud Commander in a Docker environment with latest version. The current column display is name-size-date. I'm aware that the columns system is somewhat customizable, but adding new columns appears to require modifying source code and rebuilding. These features would greatly improve the file management experience for developers and system administrators who frequently work with large numbers of files.

Example of the proposed column layout:

This feature would be similar to the column customization options available in other file managers like Double Commander, Total Commander, and Dolphin.