[WIP] Fix startup error on CachyOS with KDE Plasma 6.6.3

[Claude]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

---

This section details on the original issue you should resolve

<issue_title>Startup error</issue_title>
<issue_description>This error on

• CachyOS x86_64
• KDE Plasma 6.6.3
• KWin (Wayland)

(process:12625): GLib-GIRepository-WARNING **: 00:26:00.799: Failed to load shared library 'libgtk-4.so.1' referenced by the typelib: /usr/lib/libgtk-4.so.1: undefined symbol: g_get_monotonic_time_ns
Traceback (most recent call last):
  File "/usr/share/sidemark/sidemark.py", line 47, in <module>
    from gi.repository import Gtk, Adw, Gdk, GLib, Gio, GtkSource, Pango
  File "<frozen importlib._bootstrap>", line 1371, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1342, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 924, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 816, in module_from_spec
  File "/usr/lib/python3.14/site-packages/gi/importer.py", line 144, in create_module
    importlib.import_module("gi.repository." + dep.split("-")[0])
    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.14/importlib/__init__.py", line 88, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1406, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1371, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1342, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 924, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 816, in module_from_spec
  File "/usr/lib/python3.14/site-packages/gi/importer.py", line 144, in create_module
    importlib.import_module("gi.repository." + dep.split("-")[0])
    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.14/importlib/__init__.py", line 88, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1406, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1371, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1342, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 924, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 816, in module_from_spec
  File "/usr/lib/python3.14/site-packages/gi/importer.py", line 145, in create_module
    return load_overrides(introspection_module)
  File "/usr/lib/python3.14/site-packages/gi/overrides/__init__.py", line 128, in load_overrides
    override_mod = importlib.import_module(override_package_name)
  File "/usr/lib/python3.14/importlib/__init__.py", line 88, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.14/site-packages/gi/overrides/Gdk.py", line 143, in <module>
    RGBA = override(RGBA)
  File "/usr/lib/python3.14/site-packages/gi/overrides/__init__.py", line 209, in override
    assert g_type != TYPE_NONE
           ^^^^^^^^^^^^^^^^^^^
AssertionError

~
❯
</issue_description>

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