fix(mic-selector): don't change value on hover or arrow navigation

[ephraimduncan]

Once a microphone was selected (or defaultValue was set), merely hovering a row or arrowing through the open list fired the consumer's onValueChange and changed the trigger — as if that device had been chosen. The value now changes exactly once, when an item is activated, and opening the popover still highlights the currently selected device.

Cause: cmdk's root value tracks the highlighted item, and MicSelectorContent bound it to the public selection state — so once the component had a value (controlled mode), every pointer-move and arrow-key highlight change was reported as a selection. MicSelectorItem.onSelect was already the correct commit point; the root Command now receives only defaultValue={value} for initial highlight.

Added two regressions: hover + ArrowDown/ArrowUp leaves the onValueChange spy untouched (fails against the previous implementation), and keyboard activation fires exactly one change and closes the popover. 32/32 tests in the file pass.

[vercel]

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