fix: request keyboard enhancement flags for proper Release events

Root cause of both issues: terminals don't send Release events by
default. When pressing W while holding A, terminal stops repeating A
(but doesn't send Release), so A times out and strafing breaks.
On key release, 400ms timeout means 400ms of extra movement.

Fix: PushKeyboardEnhancementFlags(REPORT_EVENT_TYPES) in terminal init.
This asks the terminal to send proper Press/Release/Repeat events for
ALL keys, not just special ones.

With Release events:
- Key release is instant (no 400ms timeout delay)
- Pressing W doesn't cancel A's held state (terminal sends Release
  only when A is actually released)
- A/D strafing works while W is held

Fallback: if terminal doesn't support enhancement flags (old xterm),
got_release flag stays false and 150ms timeout is used. Once any
Release event is received, all keys switch to Release-based mode
(infinite timeout, rely on actual Release events).

109 tests, 0 warnings, 0 failures

src/render/terminal.rs

@@ -1,7 +1,7 @@
 use std::io::{self, Write, stdout};
 use crossterm::{
     cursor::{Hide, MoveTo, Show},
-    event::{DisableMouseCapture, EnableMouseCapture},
+    event::{DisableMouseCapture, EnableMouseCapture, KeyboardEnhancementFlags, PushKeyboardEnhancementFlags, PopKeyboardEnhancementFlags},
     execute, queue,
     style::{Color, SetBackgroundColor, SetForegroundColor, ResetColor, Print},
     terminal::{self, Clear, ClearType, EnterAlternateScreen, LeaveAlternateScreen, size as term_size},
@@ -53,6 +53,10 @@ impl Renderer for TerminalRenderer {
             stdout(),
             EnterAlternateScreen,
             Hide,
+            PushKeyboardEnhancementFlags(
+                KeyboardEnhancementFlags::DISAMBIGUATE_ESCAPE_CODES
+                    | KeyboardEnhancementFlags::REPORT_EVENT_TYPES
+            ),
             EnableMouseCapture,
             Clear(ClearType::All),
         )?;
@@ -169,6 +173,7 @@ impl Renderer for TerminalRenderer {
             stdout(),
             ResetColor,
             Show,
+            PopKeyboardEnhancementFlags,
             LeaveAlternateScreen,
             DisableMouseCapture,
         )?;