Apply saved settings (theme, poll rate) on startup

Loaded settings were never consumed — theme defaulted to dark and
poll interval stayed at 100 ms regardless of what was saved to disk.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/ui/main_window.py b/ui/main_window.py
index ea299e7..5078a60 100644
--- a/ui/main_window.py
+++ b/ui/main_window.py
@@ -83,6 +83,7 @@ class MainWindow(QMainWindow):
         self._build_ui()
         self._connect_signals()
         self._init_plugins()
+        self._apply_settings_on_startup()
 
     # ── Demo ──────────────────────────────────────────────────────────────
 
@@ -546,6 +547,10 @@ class MainWindow(QMainWindow):
                 QApplication.instance().setStyleSheet(f.read())
         self._chart.set_theme(theme)
 
+    def _apply_settings_on_startup(self):
+        self._apply_theme(self._settings.get("theme", "dark"))
+        self.engine._interval = self._settings.get("poll_ms", 100) / 1000.0
+
     def _on_settings(self, cfg: dict):
         self._settings.update(cfg)
         self.engine._interval = cfg.get("poll_ms", 100) / 1000.0