Refactor keybindings and add validated CLI arguments

Extracted common quit/esc handling into `common_keybindings`. Introduced
`Group::CtrlMovement` for Ctrl‑arrow keys and updated keybinding
definitions.
Removed duplicated quit logic in main_menu and skirmish modules. Bumped
clap to 4.6.0 and updated Cargo.lock. Added range‑checked parsers for
map
size, resources, supply limit, XP modifier and skill points in the CLI.

Cargo.toml

@@ -12,6 +12,5 @@ strip = true
 [dependencies]
 clap = { version = "4.5.53", features = ["derive"] }
 ratatui = "0.30.0"
-
 log = "0.4.29"
 simplelog = "0.12.2"