fix: padding issues (#47)

## Pull Request Description

This fixes a bunch of padding issues, and also improves padding in other
areas.

Issue Number: #29

---------

Co-authored-by: PartyDonut <PartyDonut@users.noreply.github.com>

lib/widgets/shared/alert_content.dart

@@ -0,0 +1,49 @@
+import 'package:flutter/material.dart';
+
+import 'package:fladder/util/list_padding.dart';
+
+class ActionContent extends StatelessWidget {
+  final Widget? title;
+  final Widget child;
+  final List<Widget> actions;
+  final bool showDividers;
+  final EdgeInsetsGeometry? padding;
+  const ActionContent({
+    this.title,
+    required this.child,
+    this.padding,
+    this.showDividers = true,
+    this.actions = const [],
+    super.key,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: padding ?? MediaQuery.paddingOf(context).add(const EdgeInsets.symmetric(horizontal: 16)),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          if (title != null) ...[
+            title!,
+            if (showDividers)
+              const Divider(
+                height: 4,
+              ),
+          ],
+          Expanded(child: child),
+          if (actions.isNotEmpty) ...[
+            if (showDividers)
+              const Divider(
+                height: 4,
+              ),
+            Row(
+              mainAxisAlignment: MainAxisAlignment.end,
+              children: actions,
+            )
+          ],
+        ].addInBetween(const SizedBox(height: 16)),
+      ),
+    );
+  }
+}