feat(app): add onboarding and harden alarms

lib/widgets/pluri_markdown.dart

@@ -0,0 +1,88 @@
+import 'package:flutter/material.dart';
+
+class PluriMarkdown extends StatelessWidget {
+  const PluriMarkdown(this.markdown, {super.key});
+
+  final String markdown;
+
+  @override
+  Widget build(BuildContext context) {
+    final widgets = <Widget>[];
+    for (final raw in markdown.split('\n')) {
+      final line = raw.trimRight();
+      if (line.trim().isEmpty) {
+        widgets.add(const SizedBox(height: 8));
+      } else if (line.startsWith('# ')) {
+        widgets.add(_Heading(line.substring(2), level: 1));
+      } else if (line.startsWith('## ')) {
+        widgets.add(_Heading(line.substring(3), level: 2));
+      } else if (line.startsWith('- ')) {
+        widgets.add(_Bullet(line.substring(2)));
+      } else if (!line.toLowerCase().startsWith('resumen:') &&
+          !line.toLowerCase().startsWith('summary:')) {
+        widgets.add(_Paragraph(line));
+      }
+    }
+    return Column(
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: widgets,
+    );
+  }
+}
+
+class _Heading extends StatelessWidget {
+  const _Heading(this.text, {required this.level});
+
+  final String text;
+  final int level;
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    return Padding(
+      padding: EdgeInsets.only(top: level == 1 ? 0 : 14, bottom: 8),
+      child: Text(
+        text,
+        style: (level == 1
+                ? theme.textTheme.headlineSmall
+                : theme.textTheme.titleMedium)
+            ?.copyWith(fontWeight: FontWeight.w900),
+      ),
+    );
+  }
+}
+
+class _Paragraph extends StatelessWidget {
+  const _Paragraph(this.text);
+
+  final String text;
+
+  @override
+  Widget build(BuildContext context) => Padding(
+    padding: const EdgeInsets.only(bottom: 8),
+    child: Text(text, style: Theme.of(context).textTheme.bodyMedium),
+  );
+}
+
+class _Bullet extends StatelessWidget {
+  const _Bullet(this.text);
+
+  final String text;
+
+  @override
+  Widget build(BuildContext context) => Padding(
+    padding: const EdgeInsets.only(bottom: 8),
+    child: Row(
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Icon(
+          Icons.auto_awesome_rounded,
+          size: 18,
+          color: Theme.of(context).colorScheme.primary,
+        ),
+        const SizedBox(width: 8),
+        Expanded(child: Text(text)),
+      ],
+    ),
+  );
+}