Fix floating bottom bar filling the screen when search is enabled

The Row wrapping the pill + search satellite used
crossAxisAlignment.stretch, but Scaffold.bottomNavigationBar gives its
child a loose (unbounded-max) height constraint - stretch on an
unbounded cross axis blows up to fill all available space in
profile/release builds (the debug assertion that would catch it is
stripped there), same class of bug files_controls_row.dart hit earlier
from a different cause. Both children already sized themselves
explicitly, so stretch was never actually needed - wrapping the Row in
a fixed-height SizedBox instead fixes it.

Added a regression test that reproduces this inside a real Scaffold
(the bare SizedBox host the other tests use gives a bounded height and
doesn't trigger it) - confirmed it fails without the fix (height 600,
the full test viewport) and passes with it.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

lib/widgets/noo/nav/noo_bottom_bar.dart

@@ -101,17 +101,29 @@ class NooBottomBar extends StatelessWidget {
         child: Padding(
           padding: const EdgeInsets.fromLTRB(16, 0, 16, 12),
           child: hasSearch
-              ? Row(
-                  crossAxisAlignment: CrossAxisAlignment.stretch,
-                  children: [
-                    Expanded(child: pill),
-                    const SizedBox(width: 8),
-                    _SearchSatellite(
-                      destination: searchDestination!,
-                      onTap: onSearchTap!,
-                      size: barHeight,
-                    ),
-                  ],
+              // A fixed-height SizedBox, not just a Row with
+              // crossAxisAlignment.stretch - the bottomNavigationBar slot
+              // gives this widget a *loose* (unbounded-max) height
+              // constraint, and stretch on an unbounded cross axis blows up
+              // to fill the screen in profile/release (the assertion that
+              // would catch it in debug is stripped there) - the same
+              // silent-oversizing bug files_controls_row.dart hit earlier
+              // from a different cause. Both children already size
+              // themselves explicitly (pill's own `height`, the
+              // satellite's `size`), so stretch was never actually needed.
+              ? SizedBox(
+                  height: barHeight,
+                  child: Row(
+                    children: [
+                      Expanded(child: pill),
+                      const SizedBox(width: 8),
+                      _SearchSatellite(
+                        destination: searchDestination!,
+                        onTap: onSearchTap!,
+                        size: barHeight,
+                      ),
+                    ],
+                  ),
                 )
               : pill,
         ),