fix: improve microphone mute fallback reliability using pactl

[shmall03]

Problem:

On certain hardware (specifically tested on HP laptops), the default swayosd-client --input-volume mute-toggle correctly triggers the OSD UI but fails to actually toggle the mute state in PipeWire/PulseAudio. This creates a deceptive state where the user sees a "muted" icon but the microphone remains active.

Solution:

This PR generalizes the reliable logic already used in the XPS and ThinkPad handlers into the main fallback. It uses pactl to perform the actual toggle and swayosd-client to display the custom OSD message.

Benefits:

• Ensures the microphone state actually changes on all systems.
• Maintains visual consistency with the rest of the Omarchy media keys.
• Uses pactl for broad compatibility with both PulseAudio and PipeWire.

[Copilot]

Pull request overview

This PR aims to make microphone mute toggling more reliable by switching the non-XPS/ThinkPad fallback to a pactl-driven toggle and showing a custom OSD state, and it also updates Chromium’s default appearance preferences to include color_scheme2.

Changes:

• Update omarchy-cmd-mic-mute fallback to toggle the default input source mute via pactl and show a custom OSD message/icon.
• Update Chromium default initial_preferences to set both color_scheme and color_scheme2.
• Add a migration to update both the system-wide Chromium initial preferences and an existing user profile’s Preferences file accordingly.

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Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
bin/omarchy-cmd-mic-mute	Replaces the generic mute-toggle with a pactl toggle + explicit OSD messaging.
install/config/theme.sh	Sets Chromium’s default theme prefs to include color_scheme2 alongside color_scheme.
migrations/1777018408.sh	Migrates existing installs by updating system initial prefs and user profile preferences for Chromium theme fields.

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[Copilot]

The PR title/description focus on microphone mute reliability, but this migration introduces an unrelated Chromium appearance-mode change. Please either update the PR description to include the Chromium/theme work (and why it’s bundled), or split this into a separate PR so the change history matches the documented intent.