Fourier lab: shareable links (?text=, &n=) with live URL sync + Copy link - #13
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…, Copy link #/fourier?text=YOUR+TEXT (and &n=<epicycles>) overrides the default message so a drawing can be hard-linked and shared. The lab keeps the URL in sync after every push via history.replaceState (no history spam, no hashchange loop; defaults are omitted so the plain #/fourier stays canonical), adopts a pasted link's params live through the router's new route.query, and gains a Copy link button. Router: route.query, navigate(id, query?), replaceQuery(); pure parseHashQuery/buildQuery helpers with tests. Lab tests cover reading params on mount and URL sync while typing. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Adds a hash-query override for the traced message —
#/fourier?text=YOUR+TEXT(and&n=for the epicycle count) — so drawings can be hard-linked and shared. The URL stays in sync as you type (history.replaceState, defaults omitted), pasted links are adopted live, and a Copy link button copies the current URL. Router gainsroute.query/navigate(id, query)/replaceQuery()plus pureparseHashQuery/buildQueryhelpers; tests for both layers; README documents the format.