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/.gitignore

@@ -0,0 +1,2 @@
+/target
+/web

src-tauri/Cargo.toml

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+[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

src-tauri/build.rs

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+fn main() {
+    tauri_build::build()
+}

src-tauri/gen/schemas/capabilities.json

@@ -0,0 +1 @@
+{}

src-tauri/src/main.rs

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+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
+
+fn main() {
+    tauri::Builder::default()
+        .run(tauri::generate_context!())
+        .expect("error while running pcd viewer");
+}

src-tauri/stage-web.sh

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+#!/bin/sh
+# Collect the web app into web/ for bundling. The originals at the repo root stay
+# the single source of truth — pcd_viewer.html is never edited for the native build.
+# The .pcd files are deliberately excluded: DEFAULT_URL is expected to 404 and fall
+# back to the drag-and-drop prompt, so bundling 1.2 GB of clouds would buy nothing.
+set -eu
+
+here=$(dirname "$0")
+root="$here/.."
+out="$here/web"
+
+rm -rf "$out"
+mkdir -p "$out"
+cp "$root/pcd_viewer.html" "$out/"
+cp -R "$root/vendor" "$out/"
+
+echo "staged -> $(cd "$out" && pwd)"

src-tauri/tauri.conf.json

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+{
+  "$schema": "https://schema.tauri.app/config/2",
+  "productName": "PCD Viewer",
+  "version": "0.1.0",
+  "identifier": "com.khj.pcdviewer",
+  "build": {
+    "frontendDist": "./web",
+    "beforeDevCommand": "sh ./src-tauri/stage-web.sh",
+    "beforeBuildCommand": "sh ./src-tauri/stage-web.sh"
+  },
+  "app": {
+    "windows": [
+      {
+        "url": "pcd_viewer.html",
+        "title": "PCD Viewer",
+        "width": 1440,
+        "height": 900,
+        "minWidth": 960,
+        "minHeight": 640,
+        "backgroundColor": "#0a0b0c",
+        "dragDropEnabled": false
+      }
+    ],
+    "security": {
+      "csp": "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; connect-src 'self' blob: data: ws: wss:; worker-src 'self' blob:",
+      "dangerousDisableAssetCspModification": ["script-src", "style-src"]
+    }
+  },
+  "bundle": {
+    "active": true,
+    "targets": ["app", "dmg"],
+    "icon": ["icons/icon.icns"],
+    "macOS": {
+      "minimumSystemVersion": "10.15"
+    }
+  }
+}