[7158 + 7152] Follow Ups: Remote Instance "Add to group" button breaks out of immersive mode + "Change instance type" breaks out of immersive mode

[n-lark]

Description

• Follow Up: "Change instance type" breaks out of immersive mode #7152 — Danger.vue:202-204 hardcodes instance-settings-change-type; switch to the immersive sibling when in that context.
• Follow Up: Remote Instance "Add to group" button breaks out of immersive mode #7158 — same shape in device/Overview.vue:91 (device-settings → device-editor-settings).

✅ All tests passed

• 7152 immersive nav: hosted instance → immersive editor → Settings → Danger → click Change Instance Type. Stays in immersive (URL has /editor/settings/change-type, route instance-editor-settings-change-type).
• 7152 immersive submit: on the change-type page, pick a new type and Confirm Changes. Lands on instance-editor-overview (immersive chrome stays), not /instance/:id/overview.
• 7152 non-immersive (no-regression): non-immersive Settings → Danger → Change Instance Type → Confirm Changes. Goes to instance-settings-change-type, then Instance (→ instance-overview) as before.
• 7158 immersive: remote instance assigned to an application → immersive editor → Overview → pencil next to Group. Lands on device-editor-settings?highlight=device-group-section; immersive chrome stays.
• 7158 non-immersive (no-regression): non-immersive device Overview → pencil → device-settings with the same query.

Related Issue(s)

Resolves #7158
Resolves #7152

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 (424fbb5) to head (d26cbc3).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7171   +/-   ##
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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           

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