fix(federation): primary action in the app bar and empty state, no FAB

Every other page carries its primary action top right (New flow,
Add store) — the lone Material FAB bottom right broke the pattern
and sat far from the empty-state text asking for exactly that
action. The empty state now offers the button in place too.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/pages/federation.dart

@@ -93,6 +93,19 @@ class _FederationPageState extends State<FederationPage> {
       appBar: AppBar(
         title: Text(l.federationTitle),
         actions: [
+          // Primary action lives in the AppBar like every other
+          // page (Flows: "New flow", Store: "Add store") — no FAB.
+          Padding(
+            padding: const EdgeInsets.only(right: ChainSpace.sm),
+            child: OutlinedButton.icon(
+              icon: const Icon(Icons.add_link, size: 16),
+              label: Text(l.federationAddSatellite),
+              onPressed: _addSatellite,
+              style: OutlinedButton.styleFrom(
+                visualDensity: VisualDensity.compact,
+              ),
+            ),
+          ),
           IconButton(
             icon: const Icon(Icons.help_outline, size: 18),
             tooltip: l.helpTooltip,
@@ -106,11 +119,6 @@ class _FederationPageState extends State<FederationPage> {
           const SizedBox(width: ChainSpace.sm),
         ],
       ),
-      floatingActionButton: FloatingActionButton.extended(
-        onPressed: _addSatellite,
-        icon: const Icon(Icons.add_link),
-        label: Text(l.federationAddSatellite),
-      ),
       body: FutureBuilder<List<Satellite>>(
         future: _future,
         builder: (context, snapshot) {
@@ -131,13 +139,14 @@ class _FederationPageState extends State<FederationPage> {
           }
           final sats = snapshot.data ?? [];
           if (sats.isEmpty) {
-            // The "add satellite" action lives in the FAB (always
-            // visible); don't repeat it here — that showed the button
-            // twice on the empty page.
             return ChainEmptyState(
               icon: Icons.hub_outlined,
               title: l.federationEmptyTitle,
               hint: l.federationEmptyHint,
+              action: FilledButton.tonal(
+                onPressed: _addSatellite,
+                child: Text(l.federationAddSatellite),
+              ),
             );
           }
           return ListView.separated(