Animate voice prompt hints

lib/features/mapflow/presentation/mapflow_shell.dart

@@ -2903,7 +2903,9 @@ class _VoiceStep extends StatelessWidget {
     final tokens = context.mapflowTokens;
     final canFinish = canContinue;
 
-    return Column(
+    return Stack(
+      children: [
+        Column(
           children: [
             if (placeName.trim().isNotEmpty) ...[
               Text(
@@ -2917,26 +2919,6 @@ class _VoiceStep extends StatelessWidget {
               ),
               const SizedBox(height: 10),
             ],
-        Padding(
-          padding: const EdgeInsets.only(bottom: 12),
-          child: Wrap(
-            alignment: WrapAlignment.center,
-            spacing: 6,
-            runSpacing: 6,
-            children: [
-              for (final hint in promptHints)
-                Chip(
-                  label: Text(hint),
-                  side: BorderSide(color: tokens.voiceAccent),
-                  backgroundColor: tokens.voiceAccent,
-                  labelStyle: TextStyle(
-                    color: tokens.onVoiceControl,
-                    fontWeight: FontWeight.w900,
-                  ),
-                ),
-            ],
-          ),
-        ),
             Expanded(child: _VoiceProgressGrid(progress: informationProgress)),
             if (!micAllowed)
               Padding(
@@ -2956,10 +2938,207 @@ class _VoiceStep extends StatelessWidget {
               onPressed: canFinish ? onNext : onToggleRecording,
             ),
           ],
+        ),
+        Positioned.fill(
+          bottom: 230,
+          child: _FloatingPromptHints(
+            hints: promptHints,
+            active: isRecording || informationProgress < 1,
+          ),
+        ),
+      ],
     );
   }
 }
 
+class _FloatingPromptHints extends StatefulWidget {
+  const _FloatingPromptHints({required this.hints, required this.active});
+
+  final List<String> hints;
+  final bool active;
+
+  @override
+  State<_FloatingPromptHints> createState() => _FloatingPromptHintsState();
+}
+
+class _FloatingPromptHintsState extends State<_FloatingPromptHints>
+    with SingleTickerProviderStateMixin {
+  late final AnimationController _controller;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = AnimationController(
+      vsync: this,
+      duration: const Duration(milliseconds: 13500),
+    );
+    _syncAnimation();
+  }
+
+  @override
+  void didUpdateWidget(covariant _FloatingPromptHints oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    _syncAnimation();
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  void _syncAnimation() {
+    if (widget.active && !_controller.isAnimating) {
+      _controller.repeat();
+    }
+    if (!widget.active && _controller.isAnimating) {
+      _controller.stop();
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (widget.hints.isEmpty) {
+      return const SizedBox.shrink();
+    }
+
+    return IgnorePointer(
+      child: AnimatedOpacity(
+        duration: const Duration(milliseconds: 260),
+        opacity: widget.active ? 1 : 0,
+        child: AnimatedBuilder(
+          animation: _controller,
+          builder: (context, _) {
+            return LayoutBuilder(
+              builder: (context, constraints) {
+                return Stack(
+                  fit: StackFit.expand,
+                  children: [
+                    for (var index = 0; index < widget.hints.length; index++)
+                      _FloatingPromptHint(
+                        label: widget.hints[index],
+                        index: index,
+                        progress: _controller.value,
+                        size: constraints.biggest,
+                      ),
+                  ],
+                );
+              },
+            );
+          },
+        ),
+      ),
+    );
+  }
+}
+
+class _FloatingPromptHint extends StatelessWidget {
+  const _FloatingPromptHint({
+    required this.label,
+    required this.index,
+    required this.progress,
+    required this.size,
+  });
+
+  final String label;
+  final int index;
+  final double progress;
+  final Size size;
+
+  @override
+  Widget build(BuildContext context) {
+    final tokens = context.mapflowTokens;
+    final phase = (progress + index * 0.173) % 1.0;
+    final eased = Curves.easeInOutCubic.transform(phase);
+    final visibility = _visibilityForPhase(phase);
+    final seed = index + 1.0;
+    final start = _alignment(seed, 0);
+    final end = _alignment(seed, 1);
+    final alignment = Alignment(
+      _lerpDouble(start.x, end.x, eased),
+      _lerpDouble(start.y, end.y, eased),
+    );
+    final drift = Offset(
+      math.sin((phase * math.pi * 2) + seed) * size.width * 0.035,
+      math.cos((phase * math.pi * 2) + seed * 1.9) * size.height * 0.026,
+    );
+    final scale =
+        0.76 +
+        visibility * 0.28 +
+        math.sin((phase * math.pi * 2) + seed * 2.4) * 0.035;
+    final rotation = math.sin((phase * math.pi * 2) + seed) * 0.035;
+
+    return Align(
+      alignment: alignment,
+      child: Transform.translate(
+        offset: drift,
+        child: Transform.rotate(
+          angle: rotation,
+          child: Transform.scale(
+            scale: scale,
+            child: Opacity(
+              opacity: visibility,
+              child: DecoratedBox(
+                decoration: BoxDecoration(
+                  color: tokens.voiceAccent.withValues(alpha: 0.88),
+                  borderRadius: BorderRadius.circular(999),
+                  border: Border.all(
+                    color: tokens.onDark.withValues(alpha: 0.16),
+                  ),
+                  boxShadow: [
+                    BoxShadow(
+                      color: tokens.voiceAccent.withValues(alpha: 0.30),
+                      blurRadius: 26,
+                      spreadRadius: 1,
+                    ),
+                  ],
+                ),
+                child: Padding(
+                  padding: const EdgeInsets.symmetric(
+                    horizontal: 13,
+                    vertical: 8,
+                  ),
+                  child: Text(
+                    label,
+                    maxLines: 1,
+                    overflow: TextOverflow.ellipsis,
+                    style: TextStyle(
+                      color: tokens.onVoiceControl,
+                      fontWeight: FontWeight.w900,
+                      letterSpacing: 0,
+                      height: 1,
+                    ),
+                  ),
+                ),
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  double _visibilityForPhase(double phase) {
+    if (phase < 0.16) {
+      return Curves.easeOutCubic.transform(phase / 0.16);
+    }
+    if (phase > 0.70) {
+      return Curves.easeInCubic.transform((1 - phase) / 0.30);
+    }
+    return 1;
+  }
+
+  Alignment _alignment(double seed, int salt) {
+    final xSeed = math.sin(seed * 19.73 + salt * 41.11) * 10000;
+    final ySeed = math.sin(seed * 47.31 + salt * 17.17) * 10000;
+    final x = ((xSeed - xSeed.floor()) * 1.76 - 0.88).clamp(-0.88, 0.88);
+    final y = ((ySeed - ySeed.floor()) * 1.58 - 0.79).clamp(-0.79, 0.79);
+    return Alignment(x, y);
+  }
+
+  double _lerpDouble(double a, double b, double t) => a + (b - a) * t;
+}
+
 class _VoiceProgressGrid extends StatelessWidget {
   const _VoiceProgressGrid({required this.progress});