feat(brand): rename product to Recl∆Im (Reclaim) across app, bundle, docs

Recl∆Im — the F∆I product line for Pflicht-basierte
Wirkungsanalyse und Reform-Vorschlags-Pipelines. Replaces the
working title 'Law-Heatmap', which described the demo view
rather than the platform. Heatmap, Norms list, Hub view,
Methodik are now four panes of the same Recl∆Im app.

Renames in this commit:

  Flutter package      lawheatmap_app   -> reclaim_app
  macOS bundle id      ai.flemming.lawheatmapApp -> ai.flemming.reclaim
  macOS PRODUCT_NAME   lawheatmap_app   -> reclaim_app
  Theme tokens         LawHeatmapColors/Space/Radius/Typography/Theme
                       -> Reclaim*
  Surface card         LawHeatmapCard   -> ReclaimCard
  Top-level widget     LawHeatmapApp    -> ReclaimApp
  Theme files          lawheatmap_theme.dart/lawheatmap_tokens.dart
                       -> reclaim_theme.dart/reclaim_tokens.dart
  Widget file          lawheatmap_card.dart -> reclaim_card.dart
  Build script         build-macos.sh paths and headline string
  Docs                 MACHBARKEITSSTUDIE.md, METHODIK.md, RUN.md,
                       app/README.md, flow YAML
  UI strings           'F∆I Law-Heatmap' / 'Law-Heatmap'
                       -> 'Recl∆Im' / 'Recl∆Im (F∆I)' for vendor-
                       prefixed contexts

flutter analyze: clean. flutter test: 2/2 passing.

The local working directory stays fai_lawheatmap/ for now —
the dir is referenced by the .claude project metadata; renaming
it would break session continuity for no real gain. The Forgejo
repo was renamed via API in the same change-set (fai/lawheatmap
-> fai/reclaim), with the legacy slug serving a redirect
courtesy of Forgejo's built-in rename handling.

Signed-off-by: flemming-it <sf@flemming.it>

app/lib/widgets/reclaim_card.dart

@@ -0,0 +1,53 @@
+import 'package:flutter/material.dart';
+
+import '../theme/reclaim_tokens.dart';
+
+/// Surface container — visual equivalent of fai_chain_studio's
+/// `ChainCard`, retuned to the fai_web palette.
+class ReclaimCard extends StatelessWidget {
+  const ReclaimCard({
+    super.key,
+    required this.child,
+    this.padding =
+        const EdgeInsets.all(ReclaimSpace.lg),
+    this.accent = false,
+    this.expand = false,
+  });
+
+  final Widget child;
+  final EdgeInsetsGeometry padding;
+
+  /// If true, draws a thin petrol accent bar at the top —
+  /// used for "this card carries a primary action".
+  final bool accent;
+
+  /// If true, the card grows to fill its parent's bounded
+  /// dimensions and forces the child to expand. Use when the
+  /// card is placed inside an `Expanded` widget and the child
+  /// is itself a free-sizing widget (e.g. CustomPaint).
+  final bool expand;
+
+  @override
+  Widget build(BuildContext context) {
+    final padded = Padding(padding: padding, child: child);
+    return Card(
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        mainAxisSize: expand ? MainAxisSize.max : MainAxisSize.min,
+        children: [
+          if (accent)
+            Container(
+              height: 2,
+              decoration: const BoxDecoration(
+                color: ReclaimColors.signal,
+                borderRadius: BorderRadius.vertical(
+                  top: ReclaimRadius.md,
+                ),
+              ),
+            ),
+          if (expand) Expanded(child: padded) else padded,
+        ],
+      ),
+    );
+  }
+}