♿️(frontend) add contextual browser tab titles for docs routes

[Ovgodd]

Purpose

Tabs always showed "Docs", so it was hard to know which page was open. We set a clear title per page (and matching og:title for link previews) to improve that

Proposal

• Docs grid: title depends on the current filter.
• Home, offline, and new-document pages: their own titles.

[github-actions]

Size Change: +577 B (+0.01%)

Total Size: 4.25 MB

Filename	Size	Change
apps/impress/out/_next/static/6d925b4d/_buildManifest.js	622 B	+622 B (new file)	🆕
apps/impress/out/_next/static/964e924a/_buildManifest.js	0 B	-621 B (removed)	🏆

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