Add rustfmt configuration and reformat code

- Document new Rust formatting standards in AGENTS, CODE_MAP, and
  PROGRESS.
- Add rustfmt.toml with style 2024, 2‑space indents, 100‑char width, LF
  endings.
- Apply consistent 2‑space indentation and ordering across source files.
- Minor clean‑up of imports and whitespace to match the new style.

src/app/view.rs

@@ -1,27 +1,27 @@
 use crate::app::{
-    App,
-    views::{default_view, main_menu_view, skirmish_view},
+  App,
+  views::{default_view, main_menu_view, skirmish_view},
 };
 use clap::ValueEnum;
 use ratatui::{buffer::Buffer, layout::Rect, widgets::Widget};
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, ValueEnum)]
 pub enum View {
-    MainMenu,
-    Skirmish,
-    PerkDecks,
-    SkillsConfig,
+  MainMenu,
+  Skirmish,
+  PerkDecks,
+  SkillsConfig,
 }
 
 impl Widget for &mut App {
-    fn render(self, area: Rect, buf: &mut Buffer)
-    where
-        Self: Sized,
-    {
-        match self.view {
-            View::MainMenu => main_menu_view(self, area, buf),
-            View::Skirmish => skirmish_view(self, area, buf),
-            _ => default_view(area, buf),
-        }
+  fn render(self, area: Rect, buf: &mut Buffer)
+  where
+    Self: Sized,
+  {
+    match self.view {
+      View::MainMenu => main_menu_view(self, area, buf),
+      View::Skirmish => skirmish_view(self, area, buf),
+      _ => default_view(area, buf),
     }
+  }
 }