Fix Pango layout extents error in draw_year_markers

- Replace get_extents() with get_pixel_size() for correct text measurement
- Fixes ValueError: not enough values to unpack error
- get_pixel_size() returns (width, height) tuple directly in pixels

MyTimeline.py

@@ -542,9 +542,8 @@ class MyTimelineView(NavigationView):
             )
             layout.set_text(str(year), -1)
 
-            (x_bearing, y_bearing, text_width, text_height, x_advance, y_advance) = layout.get_extents()
-            text_width = text_width / Pango.SCALE
-            text_height = text_height / Pango.SCALE
+            # Get text size in pixels
+            text_width, text_height = layout.get_pixel_size()
 
             context.set_source_rgb(0.0, 0.0, 0.0)  # Black
             context.move_to(timeline_x - 20 - text_width, y_pos - text_height / 2)