Remove manual unit setting

src/components/settings/LocationTab.tsx

@@ -280,20 +280,6 @@ export function LocationTab() {
                 </Select>
               </div>
 
-              <div className="flex items-center justify-between">
-                <div className="space-y-1">
-                  <Label>Auto-detect from location</Label>
-                  <p className="text-sm text-muted-foreground">
-                    Automatically set measurement system based on your location when you first visit
-                  </p>
-                </div>
-                <Switch 
-                  checked={unitPreferences.auto_detect} 
-                  onCheckedChange={(checked) => 
-                    updateUnitPreferences({ auto_detect: checked })
-                  } 
-                />
-              </div>
             </CardContent>
           </Card>
         </div>