chore(dev): bun install before dev/desktop so pulled deps are present (#800)

`bun desktop`/`bun dev` assumed node_modules was current, so after pulling a
branch that adds a frontend dep (e.g. the shadcn migration's tw-animate-css /
@radix-* packages) vite failed with "Can't resolve '<pkg>'" until the user
manually ran bun install. CI never caught it (CI does a frozen install).

predev/predesktop now run `bun install` first (a no-op ~25ms when up-to-date),
so a fresh pull just works.

Co-authored-by: mergetest <test@local>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

package.json

@@ -11,9 +11,9 @@
     "dev:desktop": "TAURI_SKIP_BACKEND=1 bun run --cwd frontend desktop",
     "wait:api": "wait-on -t 300000 http-get://localhost:3900/system/info",
     "wait:frontend": "wait-on -t 120000 http://localhost:5173",
-    "predev": "kill-port 3900 3901 || true",
+    "predev": "bun install && (kill-port 3900 3901 || true)",
     "dev": "bun run setup:api && concurrently -n api,fe -c green,cyan --kill-others-on-fail \"bun run dev:api\" \"bun run dev:frontend\"",
-    "predesktop": "kill-port 3900 3901 || true",
+    "predesktop": "bun install && (kill-port 3900 3901 || true)",
     "desktop": "bun run setup:api && concurrently -n api,app -c green,magenta --kill-others-on-fail \"bun run dev:api\" \"bun run dev:desktop\"",
     "desktop-prod": "bun scripts/desktop-prod.mjs",
     "desktop-prod:run": "bun scripts/desktop-prod.mjs --skip-build",