fix(ui): use temporary duration when popup times out (#1385)

When a popup expires without user interaction, now always uses "once"
duration instead of the configured default. This prevents creating
permanent blanket deny rules when the user is away from the machine.

Before: popup timeout -> applies all default settings including "forever"
After:  popup timeout -> applies action but forces duration to "once"

Only explicit user confirmation (clicking Allow/Deny) should create
permanent rules. Unattended timeouts are now conservative.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: po-nuvai

ui/opensnitch/dialogs/prompt/dialog.py

@@ -585,7 +585,13 @@ def _send_rule(self):
             self._rule = ui_pb2.Rule(name="user.choice")
             self._rule.created = int(datetime.now().timestamp())
             self._rule.enabled = True
-            self._rule.duration = utils.get_duration(self.durationCombo.currentIndex())
+            # If the popup timed out without user interaction, always use "once" duration
+            # to avoid creating permanent rules when the user is away (#1385).
+            # Only explicit user confirmation should create permanent rules.
+            if self._timeout_triggered:
+                self._rule.duration = Config.DURATION_ONCE
+            else:
+                self._rule.duration = utils.get_duration(self.durationCombo.currentIndex())
 
             self._rule.action = Config.ACTION_ALLOW
             if self._default_action == Config.ACTION_DENY_IDX: