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/__init__.py

@@ -0,0 +1,37 @@
+"""BAL - Bitcoin After Life Electrum plugin.
+
+Free and decentralized Bitcoin inheritance support for the Electrum wallet.
+
+This package was reorganized (Approach A: conservative, behavior-preserving)
+to cleanly separate logic from presentation. The original monolithic plugin
+mixed the business logic with the PyQt GUI; here the two concerns live in
+distinct sub-packages:
+
+    bal/
+        core/            GUI-free business logic (importable without Qt)
+            util.py          Generic helpers (encoding, validation, ...)
+            plugin_base.py   BasePlugin subclass, config, timestamp handling
+            heirs.py         Heir list model + transaction building
+            will.py          Will / WillItem domain model
+            willexecutors.py Will-executor (dead-man's switch) networking
+        gui/
+            qt/          PyQt6 presentation layer
+                theme.py     Colors / status -> color mapping (status_color)
+                common.py    Shared imports and small GUI helpers
+                widgets.py   Leaf widgets (editors, labels, checkboxes, ...)
+                calendar.py  BalCalendar widget
+                dialogs.py   Dialog windows (wizard, build-will, detail, ...)
+                lists.py     Tree/list views (heirs, preview, will-executors)
+                window.py    BalWindow controller (per-wallet GUI state)
+                plugin.py    Plugin class wiring Electrum @hooks to the GUI
+        qt.py            Thin loader shim re-exporting `Plugin` for Electrum
+
+Electrum discovers the plugin through ``manifest.json`` and loads the GUI
+entry point from ``qt.py`` (the shim), which imports the real ``Plugin``
+from ``gui.qt.plugin``.
+
+The plugin targets Electrum 4.7.2 (the last stable release exposing
+``json_db.register_dict``) and PyQt6.
+"""
+
+__version__ = "0.2.8"