fix(boot): backport mounted usage stats to 7.3

[SimonFair]

Summary

The 7.3.3 release-line backport restores used/free statistics for mounted boot partitions while keeping the aggregate navigation usage widget offline when the array is stopped.

Why This Exists

The 7.3 branch already contains the stopped-array utilization change from OS-804. Its array-state check also suppresses valid row-level statistics for a mounted boot partition, even though the corresponding data partition can be unmounted and should remain status-only. This backport addresses the OS-852 regression on the 7.3.3 release line.

Resolution

Keep the stopped-state guard in my_usage(), which owns the navigation widget, and restore fs_info() to use filesystem mount status as its row-level display contract. Mounted filesystems render their supplied used/free values regardless of array state; unmounted filesystems render status text. This is the targeted release-line equivalent of PR #2739.

Reviewer Considerations

• The target branch is 7.3, the branch carrying the 7.3.3 release line.
• fs_info() intentionally does not inspect fsState; the filesystem status distinguishes a mounted boot partition from an unmounted data partition.
• The backport changes only device_list and the existing regression test; it does not alter the already-backported navigation behavior.

Behavior Changes

• Stopped arrays show offline instead of a navigation usage percentage.
• Stopped mounted boot partitions show used/free statistics.
• Stopped unmounted data partitions show filesystem status without usage bars.
• Started arrays retain their existing usage displays.

Implementation Summary

• Restore fs_info() to gate usage on fsStatus == Mounted only.
• Update the regression test for mounted internal/Flash boot partitions and an unmounted data partition.

Verification

• php tests/stopped-array-utilization.php — passed.
• php -l emhttp/plugins/dynamix/nchan/device_list — passed.
• php -l emhttp/plugins/dynamix/include/Helpers.php — passed.
• php -l tests/stopped-array-utilization.php — passed.
• git diff --check — passed.

Risk

Low; the change restores the existing mount-status contract and leaves the stopped-array navigation guard unchanged.

Linear

Related to OS-852.

• Backport tracking: OS-867

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[github-actions]

🔧 PR Test Plugin Available

A test plugin has been generated for this PR that includes the modified files.

Version: 2026.09.04.0936
Build: View Workflow Run

📥 Installation Instructions:

Install via Unraid Web UI:

1. Go to Plugins → Install Plugin
2. Copy and paste this URL:

https://preview.dl.unraid.net/pr-plugins/pr-2740/webgui-pr-2740.plg

3. Click Install

Alternative: Direct Download

• 📦 Download PLG
• 📦 Download TXZ

⚠️ Important Notes:

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• Backup included: Original files are automatically backed up
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📝 Modified Files:

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emhttp/plugins/dynamix/nchan/device_list

🔄 To Remove:

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