refactor: replace debounce/throttle deps with first-party code (#38610)

Adds `web_src/js/utils/func.ts` with `debounce` and `throttle`, dropping
`throttle-debounce` and `perfect-debounce` dependencies. Both were
needed before: the former has no promise-returning debounce, which
`TextExpander` requires, and the latter no `throttle`.

Signature follows lodash and es-toolkit: `(func, wait, {leading,
trailing})` plus `cancel`, so argument order flips at the migrated call
sites.

package.json

@@ -55,13 +55,11 @@
     "mermaid": "11.16.0",
     "online-3d-viewer": "0.18.0",
     "pdfobject": "2.3.1",
-    "perfect-debounce": "2.1.0",
     "postcss": "8.5.19",
     "rolldown-license-plugin": "3.0.9",
     "sortablejs": "1.15.7",
     "swagger-ui-dist": "5.32.8",
     "tailwindcss": "3.4.19",
-    "throttle-debounce": "5.0.2",
     "tippy.js": "6.3.7",
     "toastify-js": "1.12.0",
     "tributejs": "5.1.3",
@@ -84,7 +82,6 @@
     "@types/pdfobject": "2.2.5",
     "@types/sortablejs": "1.15.9",
     "@types/swagger-ui-dist": "3.30.6",
-    "@types/throttle-debounce": "5.0.2",
     "@types/toastify-js": "1.12.4",
     "@typescript-eslint/parser": "8.64.0",
     "@vitejs/plugin-vue": "6.0.8",