fix: reliable mic mute fallback using wpctl

[SolarSpectre]

Problem

On non-XPS/ThinkPad systems, omarchy-audio-input-mute still fell back to swayosd-client --input-volume mute-toggle. That command can exit successfully while leaving the microphone mute state unchanged on PipeWire/PulseAudio setups.

Solution

Use wpctl set-mute @DEFAULT_AUDIO_SOURCE@ toggle for the actual mute toggle, then query pactl get-source-mute @DEFAULT_SOURCE@ for the resulting state and use omarchy-swayosd-client only for the OSD message/icon.

Verification

• bash -n bin/omarchy-audio-input-mute
• Fake wpctl/pactl harness confirmed the generic branch toggles muted/unmuted state and shows the expected OSD message/icon.

References

• Microphone mute bind stopped working after 3.4.0 update #4831
• XF86 mic audio mute is not working #5127
• Add ThinkPad mic mute LED sync following XPS hardware handler pattern #4938
• Enable Dell XPS Mute Mic Key #5252
• fix: Refactor ThinkPad mic mute to use omarchy-swayosd-client #5493
• fix: improve microphone mute fallback reliability using pactl #5492

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[dhh]

Sorted via 241145f