fix: sidebar overlapping status bar on notch devices

statusBarsPadding() was on the inner Column (only pushed content down),
but the GlassSurface itself started at a fixed 12dp from the top edge —
on devices with tall notches (S25 Ultra) the sidebar header sat behind
the system clock/icons. Moved statusBarsPadding() to the GlassSurface
modifier so the entire glass panel starts below the status bar.

app/src/main/java/dev/kaizen/app/chat/Sidebar.kt

@@ -119,8 +119,9 @@ fun KaizenSidebar(
     GlassSurface(
         modifier = modifier
             .fillMaxHeight()
+            .statusBarsPadding()
             .width(300.dp)
-            .padding(start = 12.dp, top = 12.dp, end = 4.dp, bottom = 12.dp),
+            .padding(start = 12.dp, top = 8.dp, end = 4.dp, bottom = 12.dp),
         shape = KaizenShapes.lg,
         tintAlpha = if (isDark) 0.80f else 0.86f,
         shadowStack = KaizenShadows.level3,
@@ -129,7 +130,6 @@ fun KaizenSidebar(
         Column(
             Modifier
                 .fillMaxSize()
-                .statusBarsPadding()
                 .padding(16.dp)
         ) {
             // ── Header ──