fix: fullscreen width + docs for single creative format

[NicolayKjarnet]

Description

Fixes an issue where DOUBLE_MIDSCROLL_SINGLE_CREATIVE didn't fill the full viewport width on publishers that apply max-width constraints to the iframe (e.g. tv2.no's max-width: 1920px).

Changes:

• Override publisher max-width with inline style so the creative always goes full-width
• Fix :host positioning in padded ad containers with margin-left: calc((100% - 100vw) / 2)
• Add the format to the docs sidebar and format overview page (was missing from navigation)

Why this is needed:
The standard DOUBLE_MIDSCROLL avoids this because its background iframe lives inside Shadow DOM, unreachable by page CSS. The single creative variant only has a foreground iframe, so it's subject to publisher constraints. The inline style override fixes this cleanly.

Issues Resolved

N/A

By submitting this pull request, I confirm that my contribution is made under the terms of the AGPL-3.0 license.

[NicolayKjarnet]

Hey @pattan, noticed that the single creative format doesn't go full-width on publishers that set max-width on the iframe. The standard DoubleMidscroll avoids this since its background iframe sits inside Shadow DOM, but the single creative variant only has a slotted iframe that's exposed to page CSS. This fixes it with an inline style override. Also added the format to the docs sidebar and overview page since it was missing from navigation. Could you have a quick look? Thanks!

[pattan]

Thanks for the report @NicolayKjarnet

My spontaneous thoughts are that this should lives into publishers integration (tv2), rather than in the format.
What are your thoughts @sannheim