Sidebar Re-design: prerequisites

[cstns]

extract the features mixin into the account store, extract the permis…sionsMixin into a composable, fix webpack devtool source mapping

Description

• the features mixin is cumbersome to use and bloats each component it's added to and cannot be used in vuex stores
• the persmissions mixin is not usable in vue stores, in order to avoid duplication
• addresses webpack's devtool source mapping for a more coherent debug environment while preserving stacktraces for posthog

Related Issue(s)

part of #4673

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

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.79%. Comparing base (605166b) to head (1cd6d0f).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4743   +/-   ##
=======================================
  Coverage   78.79%   78.79%           
=======================================
  Files         311      311           
  Lines       14781    14781           
  Branches     3384     3384           
=======================================
  Hits        11646    11646           
  Misses       3135     3135           

Flag	Coverage Δ
backend	78.79% <ø> (ø)

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