> 🤖 This PR was written by Coder Agents on behalf of Jake Howell.

Backport of #28503 to `release/2.36`.

Refs
[DEVEX-736](https://linear.app/codercom/issue/DEVEX-736/template-editor-crashes-becomes-unusable-when-opening-versions).
This carries the Monaco diff-model lifecycle cleanup and Storybook
regression coverage into 2.36, preventing template-version navigation
from retaining models until the editor becomes unusable.

The cherry-pick conflict was limited to theme imports. This keeps the
release branch's existing `@emotion/react` integration while applying
the original functional fix.

Co-authored-by: Marcin Tojek <mtojek@users.noreply.github.com>

)

Backport of #28746

Original PR: #28746 — fix(coderd/x/chatd): avoid closing poller hint
channels
Merge commit: ced03dc
Requested by: @ethanndickson

…28961)

Backport of #28429

Original PR: #28429 — fix: prevent coderd crashes from unsupported
Tailnet RPCs
Merge commit: 156c8b6
PR created manually because the backport CI job is timing out.