[Bl0ck154]

PR #85 already adds the captured macaron_cookie keys and all four Omni 1.2 modes. This PR adds an optional browser-UI submit path for Omni 1.2 text-to-video without duplicating its model-key changes.

With FLOW_OMNI12_CDP_URL configured, FlowKit routes only macaron_cookie_t2v requests through a dedicated, signed-in Google Flow Chrome tab. It selects the 1.2 model, resolution and 3–15s duration slider in the normal composer, reads the live credit quote and clicks Generate once. The browser response is captured before navigation. Existing generation throttles and unusual-activity protection still apply.

With that setting unset, extension routing is unchanged. FLOW_OMNI12_MAX_CREDITS defaults to 20; unknown live quotes and quotes exceeding the official 1.2 rates fail before submission. There are no automatic retries or CAPTCHA workarounds.

The model-label matching and duration/credit rules are adapted from the open flow-mcp PRs #29 and #30:

• Support Flow's agent-first generation UI GTAI-1/flow-mcp#29
• Extend Omni 1.2 to 3–15s and update Flow Studio (complements #29) GTAI-1/flow-mcp#30

Related FlowKit PR: #85

Validation:

• 95 focused Python tests passed, including all 13 duration values, model-label matching, price caps, and exactly-once response forwarding.
• The classic Flow UI was checked with Omni 1.2, the 3s slider, and its live 360p credit quote without submitting.
• A real 1.2 request reached Flow's YhhmEf RPC but Google rejected it for unusual activity. The new UI transport has not been confirmed by a successful end-to-end generation.

This draft is intended to merge after #85. It is opt-in and has no effect until a caller sends the new model key. Agent-first composer support, video editing, Extend and image-conditioned 1.2 through this UI path are not part of this PR. See docs/OMNI_12.md.

[Bl0ck154]

Closing this draft to keep the Omni 1.2 work focused in #85. #85 already handles all four generation modes; this optional UI transport is still not end-to-end verified because Google reported unusual activity on our account. If direct transport shows a reproducible problem after #85 lands, I'll open a smaller tested follow-up.