fix(dialogs): use open_url for clickable links in About and Update dialogs

setOpenExternalLinks uses QDesktopServices internally, which fails in
AppImage due to LD_LIBRARY_PATH modification. Replace with linkActivated
/ anchorClicked signals routed through our open_url() helper.

Author: HeikesFootSlave

src/ui/dialogs/about_dialog.py

@@ -243,7 +243,8 @@ def _build_info_column(self) -> QVBoxLayout:
 
         github_label = QLabel(f'GitHub: <a href="{_GITHUB_URL}" style="color: {_TEXT_LINK};">{_GITHUB_URL}</a>')
         github_label.setTextFormat(Qt.TextFormat.RichText)
-        github_label.setOpenExternalLinks(True)
+        github_label.setCursor(Qt.CursorShape.PointingHandCursor)
+        github_label.linkActivated.connect(lambda url: open_url(url))
         github_label.setStyleSheet("font-size: 12px;")
         col.addWidget(github_label)
 

src/ui/dialogs/update_dialog.py

@@ -22,6 +22,7 @@
 from src.ui.widgets.ui_helper import UIHelper
 from src.ui.widgets.base_dialog import BaseDialog
 from src.utils.i18n import t
+from src.utils.open_url import open_url
 from src.version import __version__
 
 __all__ = ["UpdateDialog"]
@@ -78,7 +79,8 @@ def _build_content(self, content_area: QVBoxLayout) -> None:
         self._notes_browser = QTextBrowser()
         self._notes_browser.setMarkdown(self._info.release_notes)
         self._notes_browser.setMinimumHeight(200)
-        self._notes_browser.setOpenExternalLinks(True)
+        self._notes_browser.setOpenExternalLinks(False)
+        self._notes_browser.anchorClicked.connect(lambda url: open_url(url.toString()))
         content_area.addWidget(self._notes_browser)
 
         # Progress bar (hidden initially)