docs(ui): hide the floating assistant chat launcher

[soamdesai-tfh]

Part of the Docs 3.0 QA round 2 series (splitting #170 into reviewable pieces — this PR is independent and can merge in any order).

Change

"Remove the chat window, since we already have it in the header." The chat window on the hosted site is the sticky "Ask a question…" bar docked at the bottom of every docs page (div[data-assistant-bar]) — it overlays the content while reading. Local mint dev renders the same assistant as a draggable floating launcher (bottom-left bubble) instead. This PR hides both with two scoped CSS rules — neither has a docs.json toggle.

The assistant itself is untouched: the header's Ask Assistant (⌘I) entry still opens the docked assistant panel (verified on production with this exact rule injected).

Docs page on production — bottom of the viewport while reading

Before (the bar floats over the content):

After (same page with this PR's CSS applied):

Local dev — the same feature's floating launcher, also hidden

Before:

After:

[mintlify]

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Project	Status	Preview	Updated
world	🟢 Ready	View Preview	Sep 10, 2026, 6:03 PM

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[soamdesai-tfh]

Series (Docs 3.0 QA round 2, splitting #170 — all six are independent and merge in any order): #171 alignment · #172 header tabs · #173 footer · #174 chat launcher · #175 World Tech links · #176 sidebar selected state. Screenshots live on the assets-only branch soam/docs3-qa2-assets (never merge it).

[soamdesai-tfh]

Heads-up: the first version of this PR only hid the floating launcher that local dev renders — on production the assistant shows up as the sticky "Ask a question…" bar instead, which is the actual chat window from the QA note. The commit now hides both (div[data-assistant-bar] + the dev launcher), and the description's screenshots were retaken from production, with the after-shot showing this PR's exact rule applied there. The header Ask Assistant panel keeps working.

[Takaros999]

Reviewed the current diff, surrounding source, checks, and hosted preview. No blocking findings. Preview verification was per PR; the combined merged layout was not tested.