feat: advance cursor right on hex enter and wrap to next row

src/teletext/renderer.py

@@ -129,14 +129,15 @@ class TeletextCanvas(QWidget):
                 packet = p
                 break
         
-        if packet:
+        if not packet:
-            if 0 <= self.cursor_x < 40:
-                packet.data[self.cursor_x] = byte_val
-                self.redraw()
-                self.emit_cursor_change()
-        else:
             # Create packet if missing
-            self.handle_input(chr(byte_val)) # Lazy reuse or duplicate create logic
+            packet = create_blank_packet(self.page.magazine, self.cursor_y)
+            self.page.packets.append(packet)
+
+        if 0 <= self.cursor_x < 40:
+            packet.data[self.cursor_x] = byte_val
+            self.redraw()
+            self.emit_cursor_change()
     
     def set_page(self, page: Page):
         self.page = page

src/teletext/ui.py

@@ -113,6 +113,24 @@ class MosaicDialog(QDialog):
         close_btn.clicked.connect(self.accept)
         self.layout().addWidget(close_btn)
 
+class HexLineEdit(QLineEdit):
+    def keyPressEvent(self, event: QKeyEvent):
+        if event.key() in (Qt.Key.Key_Return, Qt.Key.Key_Enter):
+            event.accept()
+            self.returnPressed.emit()
+            return
+        elif event.key() == Qt.Key.Key_Escape:
+            event.accept()
+            main_win = self.window()
+            if hasattr(main_win, 'canvas'):
+                main_win.canvas.setFocus()
+            return
+        super().keyPressEvent(event)
+
+    def mousePressEvent(self, event):
+        super().mousePressEvent(event)
+        self.selectAll()
+
 class MainWindow(QMainWindow):
     def __init__(self):
         super().__init__()
@@ -149,7 +167,7 @@ class MainWindow(QMainWindow):
         # Hex Inspector
         hex_layout = QVBoxLayout()
         hex_label = QLabel("Hex Value:")
-        self.hex_input = QLineEdit()
+        self.hex_input = HexLineEdit()
         self.hex_input.setMaxLength(2)
         self.hex_input.setPlaceholderText("00")
         self.hex_input.returnPressed.connect(self.on_hex_entered)
@@ -942,22 +960,28 @@ class MainWindow(QMainWindow):
         self.update_crc_display()
         
     def on_hex_entered(self):
-        text = self.hex_input.text()
+        text = self.hex_input.text().strip()
         try:
             val = int(text, 16)
             if 0 <= val <= 255:
                 # Update canvas input
-                # We can call handle_input with char, OR set byte directly. 
                 # Direct byte set is safer for non-printable.
                 self.push_undo_state()
                 self.canvas.set_byte_at_cursor(val)
-                self.canvas.setFocus() # Return focus to canvas
+                # Advance cursor: move one index to right, or wrap to next row and move all the way left
+                if self.canvas.cursor_x < self.canvas.cols - 1:
+                    self.canvas.move_cursor(1, 0)
+                else:
+                    new_y = min(self.canvas.rows - 1, self.canvas.cursor_y + 1)
+                    self.canvas.set_cursor(0, new_y)
+                self.hex_input.setFocus()
+                self.hex_input.selectAll()
         except ValueError:
             pass # Ignore invalid hex
             
     # Input Handling (Editor Logic)
     def keyPressEvent(self, event: QKeyEvent):
-        if not self.current_page:
+        if not self.current_page or self.hex_input.hasFocus():
             return
             
         key = event.key()