Feature Request: Changing Kernel Parameters

Nobody has claimed this yet.

It would be super useful to change kernel parameters from the GUI similar to the Grub menu edit option.

### Scenario
I fucked up my `initrd` and I cannot decrypt my disk.

#### Solution:
I boot the kernel with `init=/bin/bash`, mount the disk manually and fix the problem.

### Current Workflow
1. Go to recovery shell
2. Remount the `/boot` so it's read-write: `mount -o remount, rw /boot`
3. Open `vi /boot/grub/grub.cfg`
4. Navigate through the file and find the corresponding boot entry
5. Save
6. Reboot
7. Boot your desired option
8. Restore the `/boot/grub/grub.cfg`: `update-grub`

### New Workflow

1. "Other Boot Options" > "Show OS boot menu"
3. Hover over the desired entry
4. Press `e` to edit the entry
5. Menu to change the kernel parameter line containing the parameters from the parsed grub entry
6. Change the parameters
6. Press `Enter` to boot or `Esc` to cancel

Note that the change is not permanent and the `grub.cfg` file hasn't been changed.

Start with the existing “Other Boot Options” and “Show OS boot menu” flow, then compare it with the recovery-shell workflow using /boot/grub/grub.cfg and update-grub. Done means a selected boot entry can be edited temporarily, Enter boots with the changes, and Esc cancels without changing grub.cfg.

Written by the indexing model from the issue text.