Feature: Improve support for actions

### What feature or improvement do you think would benefit Files?

Building on #9559, there are a couple of things we can do to polish up support for custom actions.

### Requirements

- [x] Make the design responsive on smaller screen sizes (assigned to @0x5bfa)
- [x] Review and update the titles and descriptions to be more consistent and user friendly (assigned to @yair100)
- [ ] Support setting mouse buttons as shortcuts (planning is needed)
- [ ] Add support for renaming actions to help users differentiate between multiple actions of the same type (a decision is needed whether the title should be renamable or the description.)

### Files Version

v3.4

### Windows Version

Windows 11

### Comments

_No response_