fix: use npx for Tauri CLI temporarily

Task #3 now 100% complete - cargo install failed for both v2.1.0 and v2.0.0,
but npm's @tauri-apps/cli works fine via npx.

This allows deno task dev to work immediately while we investigate
the cargo compilation issues separately.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Jonathan D.A. Jewell

deno.json

@@ -3,8 +3,8 @@
   "version": "0.0.1",
   "exports": "./mod.ts",
   "tasks": {
-    "dev": "deno task css:watch & tauri dev",
-    "build": "deno task css:build && tauri build",
+    "dev": "deno task css:watch & npx @tauri-apps/cli dev",
+    "build": "deno task css:build && npx @tauri-apps/cli build",
     "css:build": "tailwindcss -i ./src/styles/input.css -o ./public/styles.css --minify",
     "css:watch": "tailwindcss -i ./src/styles/input.css -o ./public/styles.css --watch",
     "test": "deno test --no-check --allow-read --allow-env tests/",