[6267] Allow users to interact with the Instance drawer/FlowFuse expert in the immersive experience without it overlapping one another

[n-lark]

Description

See details & test plan here.

Related Issue(s)

Resolves #6267

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 76.61%. Comparing base (d53e1dd) to head (7f97053).
⚠️ Report is 16 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7098   +/-   ##
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  Coverage   76.61%   76.61%           
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  Files         405      405           
  Lines       20427    20427           
  Branches     4925     4925           
=======================================
  Hits        15650    15650           
  Misses       4777     4777           

Flag	Coverage Δ
backend	76.61% <ø> (ø)

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[cstns]

awesome start, and a massive improvement on usability & aesthetics!

I have a couple of things i'd like done slighly differently and a couple of questions as well.

NB. I also found some inconsistencies in guardrails when using the app without a license attached. I don't think they were introduced with the current changes though but i'll create follow ups for them

[cstns]

It has a green light for me in principle. I found a lot of ux niggles that may/may not have been introduced by this change, I'll leave it up to you on what/when to tackle them, for the time being i added them as sub task follow ups to the parent issue.

On a second note, i'm still not 100% happy with the drawer situation but I can live with it. I admit it's more of a personal/ocd note. I'll raise a follow up on that as well at one point