fix: skip non-Press key events to prevent double input on Windows

On Windows, crossterm fires both KeyEventKind::Press and KeyEventKind::Release
for each keypress, causing every character to be entered twice. Filter out
Release and Repeat events before dispatching to the input handler.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: okt4v

crates/asat/src/main.rs

@@ -363,6 +363,9 @@ fn run_app(
 
         let ev = event::read()?;
         if let Event::Key(key) = ev {
+            if key.kind != crossterm::event::KeyEventKind::Press {
+                continue;
+            }
             let mode_before = input_state.mode.name().to_string();
             let actions = input_state.handle_key(key, &workbook);
             let mut should_quit = false;