feat(bal): Group C settings-dialog improvements (editable dates, narrower RAW box, warning/reset/support, tooltips, bold locktime)

C2 - 'Editable dates' option (default OFF):
  - new EDITABLE_DATES config; checkbox in settings dialog
  - WillSettingsWidget.apply_editable_dates() re-locks/unlocks the
    delivery-time and check-alive fields, called from update_all() so the
    toggle takes effect immediately (same mechanism as Hide Invalidated)
  - EDITABLE_DATES included in the Reset-to-defaults list

C3 - RAW date box narrowed to ~1/3 (input box 6 chars); the trailing
  label that shows the computed absolute date kept at 10 chars (fixed a
  truncation regression)

C4 - settings dialog:
  (a) bold red warning at the top
  (b) 'Reset setting' button restoring all 7 dialog settings to defaults
      (single source of truth: BalConfig.default), not touching wills
  (c) bold 'Support: bitcoin-after.life' link (opens via webopen)

C5 - tooltips: calendar 'Export reminder dates to your calendar (.ics)',
  fee field 'Mining fee rate in sat/vByte used for the will transactions',
  fee '丰' icon 'Miner fee, click for more information' (tooltip font scoped
  to QPushButton so it matches the other tooltips)

C6 - Locktime column rendered in bold in the will list

tests/test_group_c_settings.py: 4 new tests (EDITABLE_DATES default/toggle,
  reset restores all dialog settings incl. EDITABLE_DATES, reset leaves
  unrelated config untouched). Full suite: 210 passed.

bal/gui/qt/window.py

@@ -1300,6 +1300,20 @@ class BalWindow:
             self.heirs_tab.update()
             self.will_tab.update()
             self.will_list_widget.update()
+
+            # Group C / C2: re-apply the "Editable dates" setting to the date
+            # fields of the toolbars / Heirs tab. The settings checkbox calls
+            # update_all() when toggled, so this makes the change take effect
+            # immediately (same pattern as sync_hide_filters above for the
+            # "Hide Invalidated/Replaced" checkboxes). Guarded so a missing
+            # widget never breaks the rest of the refresh.
+            for _list in (self.heir_list_widget, self.will_list_widget):
+                _settings_widget = getattr(_list, "will_settings_widget", None)
+                if _settings_widget is not None:
+                    try:
+                        _settings_widget.apply_editable_dates()
+                    except Exception as _edit_err:
+                        _logger.debug(f"apply_editable_dates error: {_edit_err}")
         except Exception as e:
             _logger.error(f"error while updating window: {e}")