UX Improvements to Immersive Editor

[cstns]

Description

• adding the ability to resize the editor drawer
• adding a resize bar and middle drawer collapse button
• changed the drawer back button to redirect to the instance details page
• open the editor in the current window when clicking the drawer external link to avoid multiple WS connections and tab discrepancies

Related Issue(s)

ref #3646
closes #3657

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

Labels

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

[cstns]

I'm not fully satisfied with the resizing action as there's a slight delay when dragging the drawer (unlike some vue plugins I checked out) but it'll do for now

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.14%. Comparing base (a5d38bb) to head (75c6084).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3753   +/-   ##
=======================================
  Coverage   79.14%   79.14%           
=======================================
  Files         278      278           
  Lines       12487    12487           
  Branches     2761     2761           
=======================================
  Hits         9883     9883           
  Misses       2604     2604           

Flag	Coverage Δ
backend	79.14% <ø> (ø)

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[joepavitt]

I'm not fully satisfied with the resizing action as there's a slight delay when dragging the drawer (unlike some vue plugins I checked out) but it'll do for now

Assuming this is because of the CSS transition on the draw height? Just fixed it with abd83ac

[joepavitt]

Great work @cstns - made a couple of very minor improvements, but otherwise, works great. Just updated to latest of main, will wait for tests to run, but should all be fine.