[feat]: Dreamverse creation studio UI uplift (Dreamina-inspired)

[aryan5v]

Purpose

Dreamina-inspired creation studio UI for Dreamverse: model/mode/config pills, reference uploads, preset quick-launch rail, and lobby polish.

Stacks as UI-only on top of upstream main. Compatible with upstream mode-selection work in hao-ai-lab/FastVideo#1835 and the #1834 protocol (generation_mode: t2va / fl2va / ref2va).

Upstream compatibility

• Sends canonical generation_mode in session_init_v2 and project_init_v1, mapped from creation studio mode IDs (t2v → t2va, fl2av → fl2va, ref2av → ref2va).
• Does not introduce a separate creation_mode wire field — backend validation/routing should follow upstream #1834 / #1835.
• Existing LTX flows remain backward-compatible when upstream ignores unknown fields; initial_image is still sent as null until asset wiring lands upstream.

Changes

• Creation studio composer (model, mode, aspect ratio, resolution, duration, references)
• Preset quick-launch rail with scroll controls
• Session config pills in active session
• interfaces.dev polish pass (typography, accessibility, motion)
• generationMode.ts bridge for upstream wire IDs

Test Plan

cd apps/dreamverse/web
npm run typecheck
npm test

Test Results

Test Files  17 passed | 1 skipped (18)
Tests  68 passed | 27 skipped (95)

Follow-ups (separate PRs)

• Mode-specific asset payloads and backend validation (tracked upstream in #1834)
• In-session config updates over websocket

  

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pstack verification note (combined with #39)

UI uplift verified as part of combined stack testing on aryan5v/dreamverse-backend-wiring-9f15 (includes this branch):

• Creation studio lobby renders: model/mode/aspect/resolution/duration pills, reference slot, preset rail
• Model menu shows FastLTX 2.3 + FastLTX 2; resolution menu includes 480P
• Sends upstream-compatible generation_mode (t2va/fl2va/ref2va) on session init

E2E: frontend-shell + mock-backed generation smoke pass when paired with mock backend (#39 branch).