feat(pickers): show what each repo is, not just its name

Both project pickers now render the server's CLAUDE.md-derived description under
the repo name. Picking `el-captain` when you meant
`el-captain-sports-management` is easy when the list is names alone, and the
consequence — an agent answering confidently about the wrong codebase — looks
like a bug in the app rather than a mis-tap.

Degrades cleanly: an older server sends no description, the field parses to an
empty string, and the tile falls back to the name on its own.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

lib/core/api/models.dart

@@ -57,12 +57,19 @@ dynamic _any(Map<String, dynamic> j, List<String> keys) {
 // --- projects ---------------------------------------------------------------
 
 class Project {
-  const Project({required this.name, required this.path});
+  const Project({required this.name, required this.path, this.description = ''});
   final String name;
   final String path;
 
-  factory Project.fromJson(Map<String, dynamic> j) =>
-      Project(name: _s(j['name']), path: _s(j['path']));
+  /// One line describing the repo, from its CLAUDE.md. Empty when the server is
+  /// older or the repo has none — the picker then shows the name alone.
+  final String description;
+
+  factory Project.fromJson(Map<String, dynamic> j) => Project(
+        name: _s(j['name']),
+        path: _s(j['path']),
+        description: _s(j['description']),
+      );
 }
 
 // --- chats ------------------------------------------------------------------

lib/features/chats/chats_screen.dart

@@ -384,6 +384,13 @@ class _ProjectPicker extends StatelessWidget {
               itemBuilder: (_, i) => ListTile(
                 leading: const Icon(Icons.folder_outlined, color: Ember.flame),
                 title: Text(projects[i].name, style: const TextStyle(fontSize: 14)),
+                subtitle: projects[i].description.isEmpty
+                    ? null
+                    : Text(projects[i].description,
+                        maxLines: 2,
+                        overflow: TextOverflow.ellipsis,
+                        style: const TextStyle(fontSize: 11, color: Ember.textFaint)),
+                isThreeLine: projects[i].description.isNotEmpty,
                 onTap: () => Navigator.pop(context, projects[i].name),
               ),
             ),

lib/features/files/files_screen.dart

@@ -382,6 +382,14 @@ class _ProjectButton extends ConsumerWidget {
                             leading: Icon(Icons.folder_outlined,
                                 color: projects[i].name == project ? Ember.flame : Ember.textDim),
                             title: Text(projects[i].name, style: const TextStyle(fontSize: 14)),
+                            subtitle: projects[i].description.isEmpty
+                                ? null
+                                : Text(projects[i].description,
+                                    maxLines: 2,
+                                    overflow: TextOverflow.ellipsis,
+                                    style: const TextStyle(
+                                        fontSize: 11, color: Ember.textFaint)),
+                            isThreeLine: projects[i].description.isNotEmpty,
                             trailing: projects[i].name == project
                                 ? const Icon(Icons.check, color: Ember.flame, size: 18)
                                 : null,