feat(web): responsive layout for phone and tablet (header stack, padding scale, seed-row wrap)

feat(web): footer credit — Made with ♥ by techfreakworm

feat(web): ProgressBar — determinate (Dialog) and indeterminate (Single)

feat(web): Studio mode toggle wires DialogComposer + dialog generate flow

feat(web): IndexedDB v2 migration; show seed and reuse button on history rows

feat(web): editorial-studio visual polish — Fraunces serif, IBM Plex mono, warm dark, ember accents

feat(web): Studio composes generate flow + SSE-driven loading banner

feat(web): Vite/React/TS/Tailwind/shadcn scaffold + Studio shell