Extensions could only put panels in the right sidebar. An add-on can now
register a panel with side: "left": its icon joins the quick-links strip
(above the web-app links), and it opens in the strip's panel slot in its
own view with the sidebar preload, so the add-on bridge, events and the
widen/narrow controls work as on the right. A left panel and a quick-link
web app never share the slot; reopening keeps the panel's page and state.
Left panels drop out of the right sidebar and its dock. With the strip
turned off they fall back to the right sidebar so they stay reachable.
Pithos is the first: bundled copy rebuilt with side: "left".
Rebuilt from Pithos/ with scripts/build-theseus-addon.mjs. Pithos moves from a toolbar menu that opened a loopback tab to a left-sidebar panel. Existing installs get the same version over the extension update channel.
Ships Pithos (the s3d control panel) as a built-in extension: the dock
menu opens it in a tab served from a loopback port, and "Stop s3d"
shuts the gateway down. Generated by Pithos/scripts/build-theseus-addon.mjs.
yaml is vendored under vendor/yaml/lib rather than node_modules/ or
dist/, because Theseus git-ignores both and a clean-worktree release
build would otherwise ship the add-on without its only dependency.
