Force Device Editor to reload if it fails first time

[hardillb]

Description

Force refresh if editor load fails first time, rather than return a raw string with the 502 return a html file with hte meta tag to force a refresh after 3 seconds

Related Issue(s)

#6797

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production
• Link to Changelog Entry PR, or note why one is not needed.

Labels

• Includes a DB migration? -> add the area:migration label

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.29%. Comparing base (2b3a0ec) to head (c470cca).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7129   +/-   ##
=======================================
  Coverage   76.29%   76.29%           
=======================================
  Files         405      405           
  Lines       20348    20348           
  Branches     4895     4895           
=======================================
  Hits        15525    15525           
  Misses       4823     4823           

Flag	Coverage Δ
backend	76.29% <100.00%> (ø)

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

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[allthedoll]

left a comma comment but otherwise i think this is fine