[Feature Request] Display "Date modified" for "Full Path" in "Core Information"

Description

Currently, in RetroArch's Main Menu under Information -> Core Information, users can see the Full Path of a core file, for example:
Full Path: /home/username/.var/app/org.libretro.RetroArch/config/retroarch/cores/ppsspp_libretro.so

However, it would be very useful to also display the Date Modified of the core file (e.g., 2025-09-30) alongside or below the Full Path. This would let users easily see when each core was last updated on their system.

Additionally, in Main Menu -> Online Updater -> Update Installed Cores, the updater currently updates the file modification date only if the core was updated. Adding a visible Date Modified field or column here would help users verify the last update date of each installed core without leaving RetroArch.

Example

When viewing Core Information, it would look like:

Full Path: /home/username/.var/app/org.libretro.RetroArch/config/retroarch/cores/ppsspp_libretro.so
Date Modified: 2025-09-30

Benefits

• Helps users track core update status at a glance
• Improves transparency of core updates within RetroArch
• Avoids having to check file system timestamps externally
• Does not depend on core info file metadata, ensuring accurate file-level modification timestamps

Additional Notes

This is a quality of life improvement that should be straightforward to implement and would improve the user experience in managing cores.

Start by locating the Main Menu's Information -> Core Information and Online Updater -> Update Installed Cores entry points, then inspect how the existing Full Path and core update data are displayed. Done means showing the installed core file's modification date in Core Information and, if feasible, in the installed-cores updater view, with the displayed date matching the file timestamp.