[WIP] Copilot cloud agent request

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Bump these dependencies to latest and open a single PR titled 'chore(deps): dependency update 2026-06-24': @ai-sdk/react, @cloudflare/vite-plugin, @cloudflare/workers-types, @tailwindcss/vite, @tanstack/react-query, @tiptap/extension-color, @tiptap/extension-highlight, @tiptap/extension-image, @tiptap/extension-link, @tiptap/extension-text-align, @tiptap/extension-text-style, @tiptap/extension-underline, @tiptap/react, @tiptap/starter-kit, @types/node, @types/react, ai, dompurify, drizzle-orm, hono, isbot, jose, postal-mime, react, react-dom, tailwindcss, workers-ai-provider, wrangler, zustand. Run the project's install + test/build before opening the PR. Do not merge.