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/README.md

@@ -0,0 +1,16 @@
+# UI
+
+This crate contains all shared components for the workspace. This is a great place to place any UI you would like to use in multiple platforms like a common `Button` or `Navbar` component.
+
+```
+ui/
+├─ src/
+│  ├─ lib.rs # The entrypoint for the ui crate
+│  ├─ hero.rs # The Hero component that will be used in every platform
+│  ├─ echo.rs # The shared echo component that communicates with the server
+│  ├─ navbar.rs # The Navbar component that will be used in the layout of every platform's router
+```
+
+## Dependencies
+
+Since this crate is shared between multiple platforms, it should not pull in any platform specific dependencies. For example, if you want to use the `web_sys` crate in the web build of your app, you should not add it to this crate. Instead, you should add platform specific dependencies to the [web](../web/Cargo.toml), [desktop](../desktop/Cargo.toml), or [mobile](../mobile/Cargo.toml) crates.