refactor: Replace superscript key with Escape key in keyboard layout

Remove the superscript 2/3 (²/³) key from AZERTY number row and replace
with visual Escape key label [E] in keyboard display. Number row now has
12 keys starting with '&' instead of 13 keys.

- Remove Key '²'/'³' from number row data model (azerty.rs)
- Add [E] escape key label at start of number row display (keyboard.rs)
- Update tests to expect 12 keys and remove superscript assertions
- Update keyboard-layout documentation with new visual layout

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: jrollin

docs/features/keyboard-layout/design.md

@@ -426,7 +426,7 @@ The visual keyboard display renders the full AZERTY layout with real-time next-k
 **Complete AZERTY visual layout:**
 
 ```
-│              [²] [1] [2] [3] [4] [5] [6] [7] [8] [9] [0] [°] [=]            │
+│              [E] [&] [é] ["] ['] [(] [-] [è] [_] [ç] [à] [)] [=]            │
 │              [Tab] [a] [z] [e] [r] [t] [y] [u] [i] [o] [p] [^] [$]          │
 │              [Caps] [q] [s] [d] [f] [g] [h] [j] [k] [l] [m] [ù] [*] [←]     │
 │              [ ⇧ ] [<] [w] [x] [c] [v] [b] [n] [,] [;] [:] [!] [ ⇧ ]        │
@@ -588,7 +588,7 @@ if key.base == '\n' {
 ```rust
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub enum RowType {
-    Number,   // ²1234567890°=
+    Number,   // &é"'(-è_çà)=
     Top,      // azertyuiop^$
     Home,     // qsdfghjklmù*
     Bottom,   // <wxcvbn,;:!

docs/features/keyboard-layout/tasks.md

@@ -48,7 +48,7 @@
 ## Phase 3: Visual Keyboard Display ✓
 
 ### AZERTY Visual Layout (src/ui/keyboard.rs)
-- [x] Number row display ([²] [1] [2] [3]... base characters)
+- [x] Number row display ([E] [&] [é] ["] [']... with Escape key prefix)
 - [x] Top row with Tab key box ([Tab] [a] [z] [e]...)
 - [x] Home row with Caps Lock key box ([Caps] [q] [s] [d]...)
 - [x] Enter key as arrow ([←]) on home row right end
@@ -61,8 +61,8 @@
 
 ### Layout Data Model (src/keyboard/azerty.rs)
 - [x] Extended RowType enum with Modifier variant
-- [x] Complete number row (14 keys including ²)
-- [x] Shift variant mappings (² → ³, letters, symbols)
+- [x] Complete number row (12 keys, starting with &)
+- [x] Shift variant mappings (letters, symbols, numbers)
 - [x] Base key lookup (handles shift variants)
 - [x] Modifier row definition
 - [x] Unit tests (91 tests passing)

src/keyboard/azerty.rs

@@ -134,7 +134,6 @@ impl AzertyLayout {
         KeyboardRow {
             row_type: RowType::Number,
             keys: vec![
-                Key::new('²', Some('³'), Finger::LeftPinky), // Superscript 2/3 (first key)
                 Key::new('&', Some('1'), Finger::LeftPinky),
                 Key::new('é', Some('2'), Finger::LeftPinky),
                 Key::new('"', Some('3'), Finger::LeftRing),
@@ -358,16 +357,16 @@ mod tests {
     #[test]
     fn test_number_row_has_13_keys() {
         let layout = AzertyLayout::new();
-        assert_eq!(layout.rows[0].keys.len(), 13);
-        // First key should be ²
-        assert_eq!(layout.rows[0].keys[0].base, '²');
-        assert_eq!(layout.rows[0].keys[0].shift_variant, Some('³'));
-        // 12th key (index 11) - French AZERTY: ) is base, ° is shift
-        assert_eq!(layout.rows[0].keys[11].base, ')');
-        assert_eq!(layout.rows[0].keys[11].shift_variant, Some('°'));
+        assert_eq!(layout.rows[0].keys.len(), 12);
+        // First key should be &
+        assert_eq!(layout.rows[0].keys[0].base, '&');
+        assert_eq!(layout.rows[0].keys[0].shift_variant, Some('1'));
+        // 11th key (index 10) - French AZERTY: ) is base, ° is shift
+        assert_eq!(layout.rows[0].keys[10].base, ')');
+        assert_eq!(layout.rows[0].keys[10].shift_variant, Some('°'));
         // Last key should be =
-        assert_eq!(layout.rows[0].keys[12].base, '=');
-        assert_eq!(layout.rows[0].keys[12].shift_variant, Some('+'));
+        assert_eq!(layout.rows[0].keys[11].base, '=');
+        assert_eq!(layout.rows[0].keys[11].shift_variant, Some('+'));
     }
 
     #[test]
@@ -382,7 +381,6 @@ mod tests {
     #[test]
     fn test_shift_mapping_numbers() {
         let layout = AzertyLayout::new();
-        assert_eq!(layout.shift_mappings.get(&'²'), Some(&'³'));
         assert_eq!(layout.shift_mappings.get(&'1'), Some(&'&'));
         assert_eq!(layout.shift_mappings.get(&'5'), Some(&'('));
         assert_eq!(layout.shift_mappings.get(&'0'), Some(&'à'));
@@ -402,13 +400,11 @@ mod tests {
     fn test_get_base_key() {
         let layout = AzertyLayout::new();
         // Base characters (French AZERTY: symbols are base, numbers are shift)
-        assert_eq!(layout.get_base_key('²'), Some('²'));
         assert_eq!(layout.get_base_key('a'), Some('a'));
         assert_eq!(layout.get_base_key('q'), Some('q'));
         assert_eq!(layout.get_base_key('&'), Some('&')); // Base character
         assert_eq!(layout.get_base_key('é'), Some('é')); // Base character
                                                          // Shift variants (numbers require shift on French AZERTY)
-        assert_eq!(layout.get_base_key('³'), Some('²'));
         assert_eq!(layout.get_base_key('A'), Some('a'));
         assert_eq!(layout.get_base_key('Q'), Some('q'));
         assert_eq!(layout.get_base_key('1'), Some('&')); // 1 is shift of &

src/ui/keyboard.rs

@@ -147,8 +147,11 @@ fn render_keyboard_row<'a>(
     // Add center padding
     spans.push(Span::raw("              ")); // 14 spaces
 
-    // Add modifier key box at start of row (Tab, Caps, Shift)
+    // Add modifier key box at start of row (E, Tab, Caps, Shift)
     match row.row_type {
+        RowType::Number => {
+            spans.push(Span::styled("[E] ", Style::default().fg(Color::DarkGray)));
+        }
         RowType::Top => {
             spans.push(Span::styled("[Tab] ", Style::default().fg(Color::DarkGray)));
         }