UI polish and signed-tx colour fix (v0.3.3)

Fix and refine the BAL plugin GUI without changing business logic:

core/will.py: restore the PUSHED requirement in needs_server_check so a
signed-but-not-broadcast will is no longer server-queried and therefore
stays blue (COMPLETE) instead of turning red (CHECK_FAIL). This matches the
original Gitea check() condition.

gui/qt/widgets.py: WillSettingsWidget vertical layout now caps every row to
the widest date-row width and left-aligns them; the leading icons keep their
original HelpButton width.

gui/qt/lists.py + gui/qt/common.py: the wizard toolbar button now shows a
28x28 icon plus a bold 'Create your will' caption (QSize imported).

gui/qt/dialogs.py (BalBuildWillDialog):
- closing summary row labelled 'All done: Ok' with a blank separator above it;
- 'checking variables' capitalised to 'Checking variables' (redundant trailing
  colon dropped);
- final auto-closing countdown replaced by an explicit right-aligned 'Close'
  button; intermediate technical pauses kept; next-steps popup preserved.

gui/qt/window.py + core/plugin_base.py: guide show_message on build, and
sync_hide_filters() in update_all so hide flags refresh immediately.

tests: test_needs_server_check updated; added offscreen preview helpers.
Version bumped to 0.3.3. 186 tests pass; ruff clean (baseline only).

tests/preview_building_will_close_btn.py

@@ -0,0 +1,105 @@
+#!/usr/bin/env python3
+"""Visual PREVIEW: replace the final countdown with a "Close" button.
+
+Mocks the "Building Will" dialog content (the result rows are built exactly as
+the real dialog builds them) and shows the proposed bottom "Close" button that
+replaces the "Please wait 5secs" auto-closing countdown.
+
+BEFORE: last line is the countdown "Please wait 5secs" (dialog auto-closes).
+AFTER : a real "Close" button at the bottom; the user closes when ready.
+
+Run:
+    QT_QPA_PLATFORM=offscreen python3 tests/preview_building_will_close_btn.py
+Writes preview_buildwill_before.png / preview_buildwill_after.png.
+"""
+
+import os
+
+os.environ.setdefault("QT_QPA_PLATFORM", "offscreen")
+
+from PyQt6.QtWidgets import (  # noqa: E402
+    QApplication, QWidget, QVBoxLayout, QHBoxLayout, QLabel, QPushButton,
+)
+from PyQt6.QtCore import Qt  # noqa: E402
+
+COLOR_OK = "#05ad05"
+
+
+def _ok(text="Ok"):
+    return "<font color='{}'><b>{}</b></font>".format(COLOR_OK, text)
+
+
+def _rows(after: bool):
+    """The exact result rows the real dialog shows on a clean run.
+
+    BEFORE keeps the old lowercase "checking variables" and the "All done"
+    row directly under the others.  AFTER applies the two text fixes:
+    capitalised "Checking variables" + a blank separator row above "All done".
+    """
+    if not after:
+        return [
+            "checking variables:\t" + _ok("Ok"),
+            "Checking your will:\t" + _ok("Ok"),
+            "Signing your will:\t<b>Nothing to do</b>",
+            "Broadcasting your will to executors:\t<b>Nothing to do</b>",
+            "All done:\t" + _ok("Ok"),
+        ]
+    return [
+        "Checking variables:\t" + _ok("Ok"),
+        "Checking your will:\t" + _ok("Ok"),
+        "Signing your will:\t<b>Nothing to do</b>",
+        "Broadcasting your will to executors:\t<b>Nothing to do</b>",
+        "",  # blank separator row
+        "All done:\t" + _ok("Ok"),
+    ]
+
+
+def _build(after: bool) -> QWidget:
+    panel = QWidget()
+    panel.setMinimumWidth(600)
+    v = QVBoxLayout(panel)
+    v.addWidget(QLabel("<b>Building Will:</b>"))
+
+    rows = QWidget()
+    rv = QVBoxLayout(rows)
+    rv.setContentsMargins(8, 4, 8, 4)
+    for line in _rows(after):
+        lbl = QLabel(line)
+        lbl.setTextFormat(Qt.TextFormat.RichText)
+        rv.addWidget(lbl)
+    v.addWidget(rows)
+
+    if not after:
+        # BEFORE: the countdown row (auto-close).
+        wait = QLabel("Please wait 5secs")
+        v.addWidget(wait)
+    else:
+        # AFTER: a Close button row, right aligned (standard dialog layout).
+        v.addSpacing(8)
+        btn_row = QWidget()
+        h = QHBoxLayout(btn_row)
+        h.setContentsMargins(0, 0, 0, 0)
+        h.addStretch(1)
+        close = QPushButton("Close")
+        close.setDefault(True)
+        close.setMinimumWidth(90)
+        h.addWidget(close)
+        v.addWidget(btn_row)
+
+    panel.resize(620, 230)
+    return panel
+
+
+def main():
+    app = QApplication.instance() or QApplication([])
+    for after, name in ((False, "preview_buildwill_before.png"),
+                        (True, "preview_buildwill_after.png")):
+        panel = _build(after)
+        panel.show()
+        app.processEvents()
+        panel.grab().save(name)
+        print("wrote", name)
+
+
+if __name__ == "__main__":
+    main()