Initial braindump app implementation

Create a complete braindump note-taking application with Dioxus 0.7 featuring:
- Note capture with title, content, and tags
- Full CRUD operations (create, read, update, delete)
- Search functionality for notes
- Tag-based filtering
- Note pinning for quick access
- Modern dark theme with purple accents
- Responsive sidebar layout
- Clean card-based note list
- Full-text editor with auto-save hint

Implemented with:
- Dioxus 0.7.1 fullstack for reactive UI and server functions
- Workspace pattern with shared API crate
- In-memory storage using LazyLock
- Server functions for note management

All core features working and ready for testing.

packages/ui/assets/styling/hero.css

@@ -0,0 +1,35 @@
+#hero {
+  margin: 0;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+}
+
+#links {
+  width: 400px;
+  text-align: left;
+  font-size: x-large;
+  color: white;
+  display: flex;
+  flex-direction: column;
+}
+
+#links a {
+  color: white;
+  text-decoration: none;
+  margin-top: 20px;
+  margin: 10px 0px;
+  border: white 1px solid;
+  border-radius: 5px;
+  padding: 10px;
+}
+
+#links a:hover {
+  background-color: #1f1f1f;
+  cursor: pointer;
+}
+
+#header {
+  max-width: 1200px;
+}