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/widgets/board.rs

@@ -1,45 +1,46 @@
 use crate::app::states::skirmish_states::BoardState;
 use ratatui::{
-    buffer::Buffer,
-    layout::{Constraint, Layout, Rect},
-    widgets::Widget,
+  buffer::Buffer,
+  layout::{Constraint, Layout, Rect},
+  widgets::Widget,
 };
 use std::rc::Rc;
 
 pub struct BoardWidget<'a> {
-    state: &'a BoardState,
+  state: &'a BoardState,
 }
 
 impl<'a> BoardWidget<'a> {
-    pub fn new(state: &'a BoardState) -> Self {
-        Self { state }
-    }
+  pub fn new(state: &'a BoardState) -> Self {
+    Self { state }
+  }
 }
 
 impl Widget for BoardWidget<'_> {
-    fn render(self, area: Rect, buf: &mut Buffer) {
-        let horizontal: Rc<[Rect]> =
-            Layout::horizontal(vec![
-                Constraint::Length(self.state.cell_width as u16);
-                self.state.cols
-            ])
-            .split(area);
+  fn render(self, area: Rect, buf: &mut Buffer) {
+    let horizontal: Rc<[Rect]> =
+      Layout::horizontal(vec![
+        Constraint::Length(self.state.cell_width as u16);
+        self.state.cols
+      ])
+      .split(area);
 
-        for (col_idx, col_area) in horizontal.iter().enumerate() {
-            let vertical: Rc<[Rect]> =
-                Layout::vertical(vec![
-                    Constraint::Length(self.state.cell_height as u16);
-                    self.state.rows
-                ])
-                .split(*col_area);
+    for (col_idx, col_area) in horizontal.iter().enumerate() {
+      let vertical: Rc<[Rect]> =
+        Layout::vertical(vec![
+          Constraint::Length(self.state.cell_height as u16);
+          self.state.rows
+        ])
+        .split(*col_area);
 
-            for (row_idx, cell_area) in vertical.iter().enumerate() {
-                self.state
-                    .cells
-                    .get(row_idx + self.state.vertical_offset.get_value())
-                    .and_then(|rows| rows.get(col_idx + self.state.horizontal_offset.get_value()))
-                    .map(|cell| cell.clone().render(*cell_area, buf));
-            }
-        }
+      for (row_idx, cell_area) in vertical.iter().enumerate() {
+        self
+          .state
+          .cells
+          .get(row_idx + self.state.vertical_offset.get_value())
+          .and_then(|rows| rows.get(col_idx + self.state.horizontal_offset.get_value()))
+          .map(|cell| cell.clone().render(*cell_area, buf));
+      }
     }
+  }
 }