feat: Improve finger color differentiation in keyboard display

Replace similar color pairs (Blue/LightBlue, Red/LightRed) with more distinct colors to improve visual clarity. Updated finger color scheme: LightCyan for L.Ring, Green for L.Index, Yellow for R.Index, LightMagenta for R.Middle, and White for R.Pinky.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

Author: jrollin

src/keyboard/azerty.rs

@@ -27,14 +27,14 @@ impl Finger {
     /// Get the terminal color for this finger
     pub fn color(&self) -> Color {
         match self {
-            Finger::LeftPinky => Color::Magenta,
-            Finger::LeftRing => Color::LightBlue,
-            Finger::LeftMiddle => Color::Blue,
-            Finger::LeftIndex => Color::Cyan,
-            Finger::RightIndex => Color::Green,
-            Finger::RightMiddle => Color::Yellow,
-            Finger::RightRing => Color::LightRed,
-            Finger::RightPinky => Color::Red,
+            Finger::LeftPinky => Color::Magenta,        // Purple/pink
+            Finger::LeftRing => Color::LightCyan,       // Bright aqua
+            Finger::LeftMiddle => Color::Blue,          // Dark blue
+            Finger::LeftIndex => Color::Green,          // Green
+            Finger::RightIndex => Color::Yellow,        // Bright yellow
+            Finger::RightMiddle => Color::LightMagenta, // Pink/light purple
+            Finger::RightRing => Color::LightRed,       // Orange-red
+            Finger::RightPinky => Color::White,         // Bright white
             Finger::Thumb => Color::Gray,
         }
     }

src/ui/keyboard.rs

@@ -334,23 +334,23 @@ pub fn render_keyboard(
             Span::raw(" Finger Guide: "),
             Span::styled("■", Style::default().fg(Color::Magenta)),
             Span::raw(" L.Pinky "),
-            Span::styled("■", Style::default().fg(Color::LightBlue)),
+            Span::styled("■", Style::default().fg(Color::LightCyan)),
             Span::raw(" L.Ring "),
             Span::styled("■", Style::default().fg(Color::Blue)),
             Span::raw(" L.Middle "),
-            Span::styled("■", Style::default().fg(Color::Cyan)),
+            Span::styled("■", Style::default().fg(Color::Green)),
             Span::raw(" L.Index"),
         ]);
 
         let legend2 = Line::from(vec![
             Span::raw("               "),
-            Span::styled("■", Style::default().fg(Color::Green)),
-            Span::raw(" R.Index "),
             Span::styled("■", Style::default().fg(Color::Yellow)),
+            Span::raw(" R.Index "),
+            Span::styled("■", Style::default().fg(Color::LightMagenta)),
             Span::raw(" R.Middle "),
             Span::styled("■", Style::default().fg(Color::LightRed)),
             Span::raw(" R.Ring "),
-            Span::styled("■", Style::default().fg(Color::Red)),
+            Span::styled("■", Style::default().fg(Color::White)),
             Span::raw(" R.Pinky"),
         ]);