BAL - Bitcoin After Life Electrum plugin (v0.2.8)

Behavior-preserving refactor of the original BAL plugin with clean separation
of business logic from the PyQt GUI.

Layout:
  bal/core/   GUI-free logic (util, plugin_base, heirs, will, willexecutors)
  bal/gui/qt/ PyQt6 presentation (theme, common, widgets, calendar, dialogs,
              lists, window, plugin)
  bal/qt.py   Qt entry-point shim (works as internal and external zip plugin)
  bal/manifest.json  standard-conforming metadata

Tooling:
  build_zip.py            deterministic, zipimport-friendly archive builder
  tests/smoke_test.py     imports + behavior regression test
  tests/external_zip_test.py  reproduces Electrum's external-zip loading

Targets Electrum 4.7.2 + PyQt6. Logic kept byte-identical where possible.

bal/bal_resources.py

@@ -0,0 +1,14 @@
+import os
+
+PLUGIN_DIR = os.path.split(os.path.realpath(__file__))[0]
+DEFAULT_ICON = "bal32x32.png"
+DEFAULT_ICON_PATH = "icons"
+
+
+def icon_path(icon_basename: str = DEFAULT_ICON):
+    path = resource_path(DEFAULT_ICON_PATH, icon_basename)
+    return path
+
+
+def resource_path(*parts):
+    return os.path.join(PLUGIN_DIR, *parts)