Bugfix/hotkey views

[cyb0rg56]

Summary

Hotkeys

• Each hotkey can have a custom label. A blank label is shown as Hotkey (n), and a custom label does not use up a number.
• Deleting asks for confirmation in a modal.
• Clicking the dimmed area or pressing Escape cancels. Delete still removes the profile.
• The same dialog is shared by profile and hotkey delete.

Header

• Save and settings moved into the window header, next to the window controls. Settings is no longer a sidebar page.
• The gear icon opens a side drawer.
• Refresh, save, and settings are plain icons. A background appears on hover, and also stays on when settings is open or the configuration has unsaved changes.
• Tooltips show below the icons so they do not cover the buttons.
• The monitor page no longer has a Retry reads button. Refresh detects monitors and reads brightness, contrast, and input source.
• Buttons use symbolic icons already bundled with libcosmic: pencil, up chevron, trash bin, refresh, floppy disk, and gear.

Other

• The About page shows the configuration file path in a read-only field, with a Copy button.
• VGA and DVI are no longer choices for monitor input or hotkey input actions.