feat: send image-to-code reference image as multimodal base64

chore: refresh html redesign baseline for AI design agents

fix: hide HF key prompt when OAuth is connected

feat: stream Anthropic output incrementally via SSE

fix: remove Anthropic max token clamp and add coverage

docs: document generation cost tracking

chore: ignore .worktrees in lint and vitest

feat: show per-generation cost and refine image-to-code prompt

feat: add pricing pipeline and API cost metadata

feat: add Anthropic frontend skill prefill in modal

chore: snapshot main for hf space