macos-native: clean branch for cloning and building the Tauri desktop app

Orphan branch with no history — includes the Tauri shell (src-tauri/) and
vendored Three.js (vendor/) that were never pushed before, so a fresh clone
can actually build the native app. Drops the large .pcd sample captures and
editor cruft (.obsidian, .DS_Store); they aren't needed to build or run the
app (point clouds load via drag-and-drop, not bundling).

src-tauri/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "pcd-viewer"
+version = "0.1.0"
+edition = "2021"
+rust-version = "1.77.2"
+
+[build-dependencies]
+tauri-build = { version = "2.6.3", features = [] }
+
+[dependencies]
+tauri = { version = "2.11.5", features = [] }
+
+[profile.release]
+codegen-units = 1
+lto = true
+opt-level = "s"
+panic = "abort"
+strip = true