fix(ui): change mag mode keybinding from ctrl+m to ctrl+o

ctrl+m sends the same byte as Enter (0x0D) in terminals, making
mag mode impossible to toggle. ctrl+o has no terminal special
meaning and "o" suggests "order" of magnitude.

Closes #191

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: cpcloud

internal/app/chat.go

@@ -1365,7 +1365,7 @@ func (m *Model) handleChatKey(key tea.KeyMsg) (tea.Model, tea.Cmd) {
 	case "ctrl+s":
 		m.toggleSQL()
 		return m, nil
-	case "ctrl+m":
+	case "ctrl+o":
 		m.toggleMagMode()
 		return m, nil
 	case "ctrl+c":

internal/app/chat_test.go

@@ -329,10 +329,10 @@ func TestChatMagModeToggle(t *testing.T) {
 	assert.False(t, m.magMode)
 
 	// Toggle on from within chat.
-	sendKey(m, "ctrl+m")
+	sendKey(m, "ctrl+o")
 	assert.True(t, m.magMode)
 
 	// Toggle off.
-	sendKey(m, "ctrl+m")
+	sendKey(m, "ctrl+o")
 	assert.False(t, m.magMode)
 }

internal/app/mag_test.go

@@ -152,17 +152,17 @@ func TestMagTransformCells(t *testing.T) {
 func TestMagModeToggle(t *testing.T) {
 	m := newTestModel()
 	assert.False(t, m.magMode)
-	sendKey(m, "ctrl+m")
+	sendKey(m, "ctrl+o")
 	assert.True(t, m.magMode)
-	sendKey(m, "ctrl+m")
+	sendKey(m, "ctrl+o")
 	assert.False(t, m.magMode)
 }
 
 func TestMagModeWorksInEditMode(t *testing.T) {
 	m := newTestModel()
 	m.enterEditMode()
 	assert.False(t, m.magMode)
-	sendKey(m, "ctrl+m")
+	sendKey(m, "ctrl+o")
 	assert.True(t, m.magMode)
 }
 

internal/app/mode_test.go

@@ -44,6 +44,8 @@ func sendKey(m *Model, key string) {
 		msg = tea.KeyMsg{Type: tea.KeyShiftTab}
 	case "ctrl+c":
 		msg = tea.KeyMsg{Type: tea.KeyCtrlC}
+	case "ctrl+o":
+		msg = tea.KeyMsg{Type: tea.KeyCtrlO}
 	}
 	m.Update(msg)
 }

internal/app/model.go

@@ -375,7 +375,7 @@ func (m *Model) handleCommonKeys(key tea.KeyMsg) (tea.Cmd, bool) {
 		m.showHouse = !m.showHouse
 		m.resizeTables()
 		return nil, true
-	case "ctrl+m":
+	case "ctrl+o":
 		m.magMode = !m.magMode
 		return nil, true
 	case "h", "left":