fix: navbar polish after the Ask AI integration

[intrepidcanadian]

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Two small navbar fixes that follow from #994 landing.

1. The side panel collapses the navbar

sidePanel: true takes the adapter's defaults, which include variant: 'inline'. The inline variant makes room for the panel by setting margin-right on #__docusaurus rather than overlaying it. Measured on a 1100px viewport with the panel open:

	closed	open
#__docusaurus width	1100	740
.navbar__inner width	1068	708
window.innerWidth	1100	1100

Docusaurus selects its mobile navbar from a 996px viewport media query, not from the container width, so above 996px it keeps the full desktop navbar even when the container is far narrower. The navbar then cannot fit its items: Core Space, the only two-word label, wraps to 61px against its siblings' 34px, and the remaining items overlap each other.

The affected range is roughly a 997–1360px viewport — below 997 the mobile navbar takes over, and above ~1360 there is enough width left after the 360px panel. That range covers common laptop widths including 1280x800 and 1366x768.

Setting variant: 'floating' overlays the panel instead. Verified at the same 1100px viewport: margin-right stays 0px and both the container and .navbar__inner keep full width whether the panel is open or closed, so the navbar cannot reflow.

2. The feedback icon looks like a chat button

The feedback link used static/img/communication.svg — two overlapping speech bubbles with a three-dot typing indicator. It points at a Microsoft Forms feedback survey, so it was already mismatched with its destination; with an Ask AI chat control now beside it, two adjacent buttons read as "chat" and only one is.

Replaced with a clipboard/form icon in the existing icon style (48x48 viewBox, 4px round strokes, #333 light / #fff dark), and both aria-label and title now read "Documentation feedback form". The old communication.svg files are left in place; nothing else references them.

Also stops the navbar reflowing in general. At a 1100px viewport the left item group is 661px and the right group 407px, totalling exactly the 1068px available — zero slack, so any added width wraps the row. white-space: nowrap on navbar links plus flex-wrap: nowrap on .navbar__inner, scoped above the 997px breakpoint so the mobile hamburger navbar is untouched.

Note on starter questions

While looking at this I checked askAi.sidePanel.suggestedQuestions, which is the built-in way to offer clickable starter questions. Enabling it throws Index algolia_ask_ai_suggested_questions does not exist as an uncaught runtime error, because it reads from a dedicated Algolia index that has to be created and populated first. Not touched here, but worth knowing before anyone turns it on.

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