Rename buildings module to structures

src/app/states/skirmish.rs

@@ -1,6 +1,6 @@
 use crate::app::states::skirmish_states::{
     BoardState,
-    buildings::{BaseBuilding, Stone, Tunnel},
+    structures::{BaseBuilding, Stone, Tunnel},
     units::MinerUnit,
 };
 use clap::ValueEnum;

src/app/states/skirmish_states/board.rs

@@ -4,7 +4,7 @@ use crate::app::{
         CellStructure, FocusedCell, Offset, Players, Units, ZoomLevel,
         skirmish_states::{
             MoveFocusedCell,
-            buildings::{BaseBuilding, Stone},
+            structures::{BaseBuilding, Stone},
             units::MinerUnit,
         },
     },

src/app/states/skirmish_states/mod.rs

@@ -1,7 +1,7 @@
 mod board;
-pub mod buildings;
 mod focused_cell;
 mod offset;
+pub mod structures;
 pub mod units;
 
 pub use board::BoardState;

src/app/widgets/cell.rs

@@ -1,4 +1,4 @@
-use crate::app::states::{CellStructure, Units, ZoomLevel, skirmish_states::buildings::Stone};
+use crate::app::states::{CellStructure, Units, ZoomLevel, skirmish_states::structures::Stone};
 use ratatui::{
     buffer::Buffer,
     layout::{Alignment, Rect},