fix(nests): respect status / nav bar insets in NestFullScreen

The room content was sliding under the status bar at the top and the
gesture / nav bar at the bottom because the outer Column only had
fillMaxSize + 16dp content padding. With Amethyst running edge-to-edge
the title cropped behind the status bar and the chat composer / Leave
button sat under the system nav bar.

Wrap the content Column in `windowInsetsPadding(WindowInsets.safeDrawing)`
INSIDE NestThemedScope but BEFORE the existing 16dp padding, so:
  - The themed background color + optional `bg` image still paint
    edge-to-edge (NestThemedScope's outer Box stays full-bleed).
  - The room body — title, participants, chat, talk row, Leave —
    is inset within the safe-drawing area.

PIP screen unchanged; the system manages PIP layout itself.

https://claude.ai/code/session_01RDpuki4t8StSg1CZcXnV5b

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/nests/room/NestFullScreen.kt

@@ -28,9 +28,12 @@ import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.safeDrawing
+import androidx.compose.foundation.layout.windowInsetsPadding
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.AlertDialog
@@ -95,10 +98,17 @@ internal fun NestFullScreen(
 ) {
     val roomTheme = androidx.compose.runtime.remember(event) { RoomTheme.from(event) }
     NestThemedScope(theme = roomTheme, accountViewModel = accountViewModel) {
+        // Inset the room content inside the system bars so the title
+        // doesn't slide under the status bar and the Leave / chat
+        // composer don't sit beneath the gesture / nav bar. The
+        // themed background color and `bg` image still paint
+        // edge-to-edge — they live on NestThemedScope's outer Box,
+        // which is intentionally outside this padding.
         Column(
             modifier =
                 Modifier
                     .fillMaxSize()
+                    .windowInsetsPadding(WindowInsets.safeDrawing)
                     .padding(16.dp)
                     .verticalScroll(rememberScrollState()),
         ) {