Mara hit:
TypeError: can't access property "innerHTML", root is null
renderContainers app.js:666
applyContainerStateChanged app.js:484
container_state_changed app.js:2306
…on /flow.html. The same bundled `app.js` runs on both /index.html
(dashboard, has the tab panes) and /flow.html (flow page, has only
the broker terminal). SSE events arrive on every page —
`container_state_changed` / `tombstones_changed` / `approval_*` /
`question_*` route through their corresponding renderers, which
then `root.innerHTML = ''` on `$('section-id')` and crash when the
section isn't in the DOM.
The convention is already "no-op when the target DOM doesn't
exist" — `renderMetaInputs`, `renderRebuildQueue`, `renderReminders`
all guard with `if (!root) return;` at the top. Bring the rest in
line:
- `renderContainers`
- `renderTombstones`
- `renderQuestions`
- `renderApprovals`
`renderInbox` already handles the absent case via its
`if (root && !root.hidden)` branch — no change.
No behaviour change on /index.html. On /flow.html the failing
events silently no-op as intended (terminal renderers still
re-render the broker tail normally).
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