docs(changelog): backfill last-24h sidebar trigger entry

For 323985f4ca (Val Alexander/@BunsDev): adds a Control UI/exports
entry covering the sidebar-trigger affordance alignment across the
resizable divider, mobile layout, and exported-HTML transcript template.
The other Val/@BunsDev fix (b1c515270e) was already covered by the
existing "Control UI/mobile: persist mobile chat settings" entry.

The rest of the last 24h's missing-CHANGELOG candidates are either:
- already covered by adjacent entries (Shakker manifest auth-evidence
  series under "CLI/models: keep manifest auth-evidence credentials
  visible", Discord application id + Cloudflare 429 under "Channels/
  Discord: cool down Cloudflare/Error 1015 HTML 429", config patch
  follow-ups under "Plugins/runtime-deps: add openclaw plugins deps",
  etc.);
- internal/test/CI/refactor with no operator surface;
- Clawsweeper-bot self-fixes for already-merged PRs;
- Peter-only with no external collaborator (per the
  attribution rule against thanking @steipete).

CHANGELOG.md

@@ -55,6 +55,7 @@ Docs: https://docs.openclaw.ai
 - CLI/status: honor channel-specific model context-window overrides when reporting effective context, so channel-scoped sessions reflect the active window in `openclaw status`. Thanks @HemantSudarshan.
 - Sandbox/Docker: tolerate Docker daemon unavailability when sandbox mode is off, so doctor and preflight checks no longer fail on installs that do not run the Docker daemon. Fixes #73671. Thanks @kaseonedge.
 - Control UI/mobile: persist mobile chat settings through Lit-managed state and route mobile navigation through the same view-state path so chat panel toggles survive transitions on small viewports. Thanks @BunsDev.
+- Control UI/exports: align sidebar trigger affordances across the resizable divider, mobile layout, and exported-HTML transcript template so the sidebar toggle and exported transcript sidebar render with consistent hit areas and styling. Thanks @BunsDev.
 - Media: include redacted per-attempt resize failures and resolved model input capabilities in vision-pipeline errors so ARM64 image failures are diagnosable without closing the remaining routing investigation. Refs #74552. Thanks @1yihui.
 - Control UI/i18n: route zh-CN agent, debug, channel-refresh, and exec-approval copy through the locale source while preserving the English `Cron Jobs` agent tab label and the security-audit command styling. Carries forward #39692 repair context. Thanks @hepeng154833488 and @vincentkoc.
 - Auto-reply: honor explicit `silentReply.direct: "allow"` for clean empty or reasoning-only direct chat turns while keeping the default direct-chat empty-response guard conservative. Fixes #74409. Thanks @jesuskannolis.