feat: sentry integration (#51)

* feat: integrate sentry error reporting

* feat: report logger errors to sentry with 30s log context

src/routes/settings.tsx

@@ -216,7 +216,7 @@ function SettingsPage() {
                   />
                 </div>
                 {isMac && (
-                  <p className="text-xs text-muted-foreground">
+                  <p className="text-muted-foreground text-xs">
                     {t(
                       'settings.startup.macos_hint',
                       'macOS requires a signed app for Login Items to work. If auto-start fails, please sign the app or enable it manually in System Settings.',
@@ -254,6 +254,46 @@ function SettingsPage() {
               </div>
             </CardContent>
           </Card>
+
+          {/* Privacy & Error Reporting Card */}
+          <Card>
+            <CardHeader>
+              <CardTitle>{t('settings.privacy.title', 'Privacy')}</CardTitle>
+              <CardDescription>
+                {t(
+                  'settings.privacy.description',
+                  'Control how your data is used to improve the application.',
+                )}
+              </CardDescription>
+            </CardHeader>
+            <CardContent className="space-y-4">
+              <div className="flex items-center justify-between rounded-lg border p-4">
+                <div className="space-y-1">
+                  <Label>{t('settings.privacy.error_reporting', 'Error Reporting')}</Label>
+                  <p className="text-xs text-gray-500">
+                    {t(
+                      'settings.privacy.error_reporting_desc',
+                      'Send anonymous error reports to help us improve the app. No personal data is collected.',
+                    )}
+                  </p>
+                </div>
+                <Switch
+                  checked={config?.error_reporting_enabled || false}
+                  onCheckedChange={async (checked) => {
+                    if (config) {
+                      await saveConfig({ ...config, error_reporting_enabled: checked });
+                    }
+                  }}
+                />
+              </div>
+              <p className="text-muted-foreground text-xs">
+                {t(
+                  'settings.privacy.restart_note',
+                  'Changes to error reporting will take effect after restarting the application.',
+                )}
+              </p>
+            </CardContent>
+          </Card>
         </TabsContent>
 
         {/* --- PROXY TAB (Upstream Proxy Config Only) --- */}