Per mara's review: '2 and maybe 1, but 3 also sounds reasonable on first
glance' (against 3 options I posted). Doing 2 and 1, leaving open()/
openNamed() as-is (option 3, tentative only).
Both dashboard/common.js and agent/app.js now export/use the
<hive-side-panel> element instance directly (sidePanel) instead of a
thin Panel = { open, openNamed, refresh, close } object that existed
purely to keep the old call-site shape unchanged. All 6 real call sites
updated to call the element's own methods directly.
The .side-panel-body class each wrapper stamped onto its own instance,
purely so common.css/agent.css's pre-existing content-styling selectors
kept matching, is gone too -- those selectors now use the element's own
tag name as the root (hive-side-panel .md, hive-side-panel .agent-inbox),
which already uniquely identifies the light-DOM instance without a
compatibility class. Verified via headless Chromium/CDP that the
tag-name selectors resolve correctly with no class needed.
Drive-by: removed an unrelated dead Panel import in call.js.
399a837e17