Dashboard fan tile ignores lm-sensors labels and always shows "FAN n"

Summary

The Dashboard's fan tile labels fans FAN 1, FAN 2, … from a loop index, and
ignores the labels lm-sensors already provides. A user who has named their fans
in /etc/sensors.d/ sees those names everywhere except the Dashboard.

Where

emhttp/plugins/dynamix/DashStats.page

$fans = exec("sensors -uA 2>/dev/null|grep -c 'fan[0-9]_input'");   // ~line 117
...
$label[$i][] = "<span{$class}>"._('FAN')." ".($fan+1)."</span>";     // ~line 810

The tile only ever obtains a count. The label is synthesised from the index,
so no sensor name can reach it.

Note the two halves behave differently, which is what makes this odd in use:

• ignore works. Because the count comes from sensors, ignoring a header
  in /etc/sensors.d/ correctly removes it from the tile.
• label does not. The name is discarded.

So a user can successfully hide a fan but cannot name one.

Reproduction

With three of six headers unpopulated, add /etc/sensors.d/example.conf:

chip "nct6798-*"
    label fan1 "Rear exhaust"
    label fan2 "CPU"
    label fan3 "Front cage"
    ignore fan4
    ignore fan5
    ignore fan7

sensors then reports exactly what you'd want:

Rear exhaust:              954 RPM  (min =    0 RPM)
CPU:                       938 RPM  (min =    0 RPM)
Front cage:                266 RPM  (min =    0 RPM)

Running the tile's own label loop verbatim against that system:

live fan count from sensors: 3
labels the dashboard renders:
  FAN 1
  FAN 2
  FAN 3

The count correctly dropped from 6 to 3, and all three names were dropped.

Suggested fix

sensors -j already returns JSON keyed by the label, and honours ignore:

"Rear exhaust": { "fan1_input": 954.0, "fan1_min": 0.0, ... },
"CPU":          { "fan2_input": 938.0, ... },
"Front cage":   { "fan3_input": 266.0, ... }

Taking the display name from that key — and falling back to FAN n when the
key is still the raw sensor name (fan1, fan2, …), i.e. when the user has
not set a label — would use the mechanism lm-sensors already provides, needs no
new configuration or UI, and leaves the default appearance unchanged for
everyone who has not configured labels.

Environment

• Unraid Server OS 7.3.2
• ASUS Pro WS W680-ACE, Nuvoton NCT6798D (nct6775), 6 fan headers, 3 populated

Start in emhttp/plugins/dynamix/DashStats.page at the sensors count near line 117 and the fan label loop near line 810; inspect the sensors -j output and how ignored headers are represented. The work is done when configured lm-sensors labels appear in the Dashboard fan tile, while unlabelled sensors still display FAN n and ignored headers remain absent.