Fix text input on kiosk: add keycodeToChar fallback for email/license pages

The kiosk lacks an input method framework, so SDL2 never generates
TextInputEvent. The WiFi password page already had a keycodeToChar
fallback but email and license key pages did not — characters were
never appended to inputText. Also removes excessive debug logging
from the previous commit.

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

internal/application/application.go

@@ -378,17 +378,7 @@ func (app *Application) handleEvents() {
 			app.running = false
 			return
 
-		case *sdl.TextInputEvent:
-			logger.Info("[EVENT] TextInputEvent: text=%q, IsTextInputActive=%v", e.GetText(), sdl.IsTextInputActive())
-
 		case *sdl.KeyboardEvent:
-			eventType := "KEYDOWN"
-			if e.Type == sdl.KEYUP {
-				eventType = "KEYUP"
-			}
-			logger.Info("[EVENT] KeyboardEvent: type=%s, sym=%d (%s), scancode=%d, mod=0x%04x, IsTextInputActive=%v",
-				eventType, e.Keysym.Sym, sdl.GetKeyName(e.Keysym.Sym), e.Keysym.Scancode, e.Keysym.Mod, sdl.IsTextInputActive())
-
 			if e.Type == sdl.KEYDOWN && e.Repeat == 0 {
 				isCtrlPressed := (e.Keysym.Mod&sdl.KMOD_CTRL) != 0 || (e.Keysym.Mod&sdl.KMOD_GUI) != 0
 				if e.Keysym.Sym == sdl.K_c && isCtrlPressed {