fix(settings): pin Add Source container to static insets

With many fields, the Add Source sheet could keep re-triggering its
settle animation: animated window insets reached the container while
its height followed the content. Keep only the static status bar
inset on the sheet container; the content already pads itself for
the navigation bar and IME.

app/src/main/java/com/example/research/ui/settings/components/DictionaryManagement.kt

@@ -10,6 +10,8 @@ import androidx.compose.animation.shrinkVertically
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.statusBars
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.ExperimentalMaterial3Api
@@ -218,7 +220,8 @@ fun DictionaryManagement(
                 focusManager.clearFocus(force = true)
                 setShowUrlBottomSheet(false)
             },
-            sheetState = sheetState
+            sheetState = sheetState,
+            contentWindowInsets = { WindowInsets.statusBars }
         ) {
             DictionaryUrlInputContent(
                 existingSources = sources,