Polish floating bottom bar: elevation, height, overlap, and FAB shape

- Give the floating bar and search satellite the app's one shadow
  (nooDialogShadow) plus a smaller, tighter height on both platforms.
- Let every tab's scrollable list compute its own bottom clearance
  (bottomBarClearance) instead of a flat 100px, so the floating bar no
  longer overlaps the last row/card.
- Square the Android upload FAB off to a rounded-square radius when the
  bottom bar is attached, keeping it fully round only when floating.
- Let a swipe on a file row trigger its action directly once dragged
  past 1.8x the reveal width, instead of requiring a second tap.

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

lib/widgets/noo/core/noo_fab.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:lucide_icons_flutter/lucide_icons.dart';
 import '../../../theme/design_tokens.dart';
+import '../nav/noo_nav_style.dart';
 
 /// Android-only extended Upload pill, bottom-right of Files and Photos (Noo
 /// Design System project, `components/core/FAB.jsx`). 56px tall, accent
@@ -10,11 +11,21 @@ import '../../../theme/design_tokens.dart';
 /// don't support upload, so the button stays in place and resizes as the
 /// user switches tabs instead of the Scaffold popping it fully in/out -
 /// the label's width animates away rather than the FAB disappearing.
+///
+/// [barStyle] shapes the corners to match the bottom bar it sits above
+/// (Settings > Appearance). With [NooBottomBarStyle.floating] the FAB stays
+/// fully round (`NooRadii.pill`) - consistent with that mode's other
+/// elements, which are already rounder (the bar itself at 28px, its search
+/// satellite a full circle). With [NooBottomBarStyle.attached] the FAB
+/// squares off to `NooRadii.card`, a rounded square that fits attached's
+/// flatter, edge-to-edge aesthetic; this applies whether [collapsed] or not,
+/// so the FAB keeps one consistent identity per bar style.
 class NooFab extends StatelessWidget {
   final String label;
   final IconData icon;
   final VoidCallback? onTap;
   final bool collapsed;
+  final NooBottomBarStyle barStyle;
 
   const NooFab({
     super.key,
@@ -22,17 +33,21 @@ class NooFab extends StatelessWidget {
     this.icon = LucideIcons.plus,
     this.onTap,
     this.collapsed = false,
+    required this.barStyle,
   });
 
   @override
   Widget build(BuildContext context) {
     final colors = context.nooColors;
+    final radius = BorderRadius.circular(
+      barStyle == NooBottomBarStyle.attached ? NooRadii.card : NooRadii.pill,
+    );
     return Material(
       color: colors.accent,
-      borderRadius: BorderRadius.circular(NooRadii.pill),
+      borderRadius: radius,
       child: InkWell(
         onTap: onTap,
-        borderRadius: BorderRadius.circular(NooRadii.pill),
+        borderRadius: radius,
         child: AnimatedContainer(
           duration: NooMotion.base,
           curve: NooMotion.ease,