Replace legacy Memory Explorer with React 19

[EyJunge1]

Summary

• replace the legacy vanilla/Svelte Memory Explorer with a React 19 + Vite + Tailwind/shadcn UI
• preserve the REST API, auth-token injection, routing, i18n, themes, memory workflows, profile management, and migrations
• share validated API types with the frontend and serve built assets consistently in compiled and source/test modes

Test plan

• bun run typecheck
• bun run build
• bun test — 270 tests pass; local Bun 1.3.14 panics during native teardown after reporting completion
• HTTP smoke test: /, /project-memories, /user-profile, /api/health, and the hashed React bundle return 200
• repository scan confirms no Svelte source files, Svelte dependencies, or legacy src/web assets remain

Made with Cursor

[tickernelz]

Merged into main as part of the newest-to-oldest integration batch and scheduled for the v2.22.0 release.

The combined four-PR tree was verified with:

• bun install --frozen-lockfile
• cd web && bun install --frozen-lockfile
• bun run typecheck
• bun run build (including the React/Vite production bundle)
• bun test — 287 passed / 0 failed / 631 assertions
• git diff --check

The pushed main tree exactly matches the locally tested synthetic merge tree.

[tickernelz]

Released in v2.22.0. The npm registry artifact was downloaded, checksum-verified, installed with lifecycle scripts disabled, and passed native dependency, libSQL vector, package entrypoint, and bundled web UI checks.