Only the detail page produced a real URL before; top-level video pages (search,
library, discover, calendar, watchlist, wishlist, …) pushed nothing and even
cleared the URL to '/'. Now each page deep-links to '/' + pageId (e.g.
/video-search), mirroring music's '/<page>' and the existing /video-detail/ scheme:
- navigate() pushes/replaces { videoPage } history state; parsePagePath/buildPagePath
added alongside parseDetailPath/buildDetailPath.
- popstate restores a page URL (and hands the side back to music when Back crosses
out of /video-*); boot restores a page deep link, re-asserting the URL against
music's boot clobber (same tactic the detail boot already uses).
- applySide() is now chrome-only; switchSide()/boot drive navigation explicitly.
- Nav anchors carry the real href=/video-<page> (was '#') and the click handler
lets ⌘/Ctrl/middle-click open a new tab — full parity with the music nav + cards.
Server already serves /video-* via the SPA catch-all; music side untouched
(isolated IIFE). Reload / Back / Forward / new-tab now work for every page.
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