perf(web): load Zendesk on support intent

[lyzno1]

Summary

• keep the Common Layout server gate for Cloud edition, widget configuration, and CSP nonce
• load the Zendesk SDK only after the existing Contact Us action
• preserve single-flight loading, timeout and retry handling, and queued conversation-field synchronization
• settle an interrupted load when its Console owner unmounts while preserving React Strict Mode replay
• remove the obsolete utils.ts forwarding layer so consumers use the runtime owner directly

Measured impact

With cache disabled on an authenticated localhost:3000 session:

• Home and Apps loaded with 0 Zendesk requests and no Zendesk script or iframe
• the first Contact Us action opened the widget and loaded 36 Zendesk requests totaling 628,440 B, including 613,377 B of JavaScript
• closing and reopening the widget added 0 Zendesk requests and kept a single script and widget instance

This moves approximately 0.63 MB of third-party network and JavaScript work out of the Console startup path. The cost is deferred to the first support intent, not removed for users who open Contact Us.

Validation

• vp test run --project unit app/components/base/zendesk/__tests__/runtime.spec.ts app/components/base/zendesk/__tests__/script.spec.tsx app/components/base/zendesk/__tests__/index.spec.tsx app/components/main-nav/components/__tests__/support-menu.spec.tsx context/__tests__/console-bootstrap.spec.tsx (37 tests)
• focused vp check for the updated Zendesk script and regression spec
• browser-verified Home and Apps cold loads, first widget open, close, and reopen on localhost:3000 with a configured widget key

Screenshots

Not applicable. The support menu UI and Contact Us behavior are unchanged.

Fixes SNP-742

From Codex

[codecov]

Codecov Report

❌ Patch coverage is 95.79832% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.93%. Comparing base (bda60a3) to head (6d541d3).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
web/app/components/base/zendesk/runtime.ts	92.64%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #41653      +/-   ##
==========================================
- Coverage   86.93%   86.93%   -0.01%     
==========================================
  Files        5309     5314       +5     
  Lines      306039   306232     +193     
  Branches    61329    61363      +34     
==========================================
+ Hits       266061   266217     +156     
- Misses      34691    34728      +37     
  Partials     5287     5287              

Flag	Coverage Δ
dify-ui	93.75% <ø> (ø)
web	87.06% <95.79%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.