panel.html loaded lib/jsqr.js synchronously: 257 KB and 10,105 lines of
vendored decoder parsed on every panel open, so on every hide/show, for a
feature most sessions never touch. It is now fetched the first time someone
imports a QR image, with concurrent callers sharing one load and a failed
load retryable rather than cached as a permanent rejection.
qr.js and panel.js get `defer`, so the browser can paint the (already dark)
document before executing 300 KB of panel.js. Order is preserved, so qr.js
is still defined before panel.js runs.
Parsed on open: 650 KB -> 399 KB.
This shortens the blank window but does not remove it. The white box itself
is Theseus-side: the sidebar panel's view is built as
new WebContentsView({ webPreferences: { preload: "sidebar-preload.js" } })
with no backgroundColor, and Electron defaults a view's background to white —
so white shows from view-attach until the page paints. Every other view in
the app passes a colour, and registerSidebarPanel takes only
{id, title, icon, page}, so an add-on cannot declare one. Not fixed here:
main.js belongs to the Theseus work in flight.
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