quick-add-popover: Port to libadwaita widgets and merge stack pages
Both stack pages are merged into one, to avoid additional clicks. Mnemonics were added to accommodate keyboard users as well.
GtkEntry was replaced by AdwEntryRow, and the GtkListBoxRows were replaced by AdwActionRows with GtkCheckBoxes as children.
"Edit Details" and "Add" buttons were replaced with their respective icons.
Screenshots
| Single-day event | Multi-day event |
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Edited by Hari Rana