v0.7.1 — fix x_tweet account label

Fixes

• x_tweet account label resolution: x_tweet (tweet detail) called TweetDetail with the raw in.Cookies field, skipping resolveCookies. Passing account=<label> (no inline cookies) failed with x_tweet: cookies required even for a stored, live account. It now resolves cookies like every other x_* tool (label precedence → CookiesForLabel, else inline blob), supporting both stored account labels and inline cookies.

Audited all x_* handlers: x_tweet was the only affected tool. x_account_save intentionally keeps the raw blob.

Full changelog: v0.7.0...v0.7.1