### System details

ThinkPad X1 Carbon Gen 11 (21HM005NMX), Intel i7-1355U, Iris Xe, Intel SOF HDA DSP / Realtek ALC287 (`sof-hda-dsp`), Omarchy 4.0.4-1, PipeWire 1.6.8, WirePlumber 0.5.17, kernel 7.2.5-3-omarchy

### What's wrong?

The audio panel lists inputs whose port is unavailable, and clicking one does nothing visible. The row looks like any other row, so it reads as a broken click rather than as an unplugged device.

On this laptop the row is "Stereo Microphone", the analog mic on the 3.5 mm combo jack, with nothing plugged in.

#### Steps to reproduce

1. On a laptop with a combo headset jack, leave the jack empty.
2. Open the audio panel. INPUT lists both "Stereo Microphone" and "Digital Microphone".
3. Click "Stereo Microphone".

Result: the highlight stays on "Digital Microphone". No error, no feedback.

Expected: the unplugged input is not listed, the same way unplugged outputs are not listed.

#### Why it happens

The click does go through. `omarchy-audio-input-set-default` sets the preferred source, but WirePlumber leaves unavailable nodes out of default selection (`haveAvailableRoutes` in `linking-utils.lua`), so the actual default never changes. The panel highlights the actual default.

```
$ pactl list cards | grep -E '^\s+\[In\]'
[In] Mic2: Stereo Microphone (type: Mic, priority: 200, availability group: Mic, not available)
[In] Mic1: Digital Microphone (type: Mic, priority: 100, availability unknown)

$ amixer -c sofhdadsp contents | grep -A2 "Mic Jack"
numid=12,iface=CARD,name='Mic Jack'
  ; type=BOOLEAN,access=r-------,values=1
  : values=off

$ pactl set-default-source alsa_input.pci-0000_00_1f.3-platform-skl_hda_dsp_generic.HiFi__Mic2__source
$ pw-metadata -n default | grep audio.source
default.configured.audio.source = ...HiFi__Mic2__source
default.audio.source            = ...HiFi__Mic1__source
```

(`pw-metadata` output shortened to key and node name.)

#### Where the panel differs between outputs and inputs

In `shell/plugins/panels/audio/Panel.qml`, outputs are filtered by availability and inputs are not. This is still the case on the current `quattro` branch:

```qml
readonly property var rawAudioSinks: {
  var list = []
  for (var i = 0; i < candidateSinks.length; i++)
    if (sinkAvailable(candidateSinks[i])) list.push(candidateSinks[i])
  ...
}

readonly property var rawAudioSources: {
  var list = candidateSources.slice()
  ...
}
```

`omarchy-audio-sink-availability` feeds `sinkAvailable()`. There is no equivalent for sources. On this machine that is why Headphones and the three HDMI outputs are hidden while the unplugged mic is shown.

#### Suggested fix

Give sources the same treatment as sinks: a source availability helper (or one helper covering both), and a `sourceAvailable()` filter in `rawAudioSources`. The current default source should stay listed even if it is unavailable, as the sink list already does.

#### Related

- #12489 drops unplugged jacks from the output list; inputs are not covered.
- #13358 is a different symptom of the same always-present headset-jack source.
- #11005 covers output handling on a ThinkPad with the same sound card.