Keep the stereo point matching help icon on its row and its label clear of the switch above

[mattdawkins]

• In the stereo settings, the point matching select could push its "?" help icon onto the next line, and its floated "Stereo point matching" label ran into the switch above it.
• The row no longer wraps: the select column may shrink (min-width: 0) so the selection text truncates with an ellipsis, and the help column keeps its width. The select keeps Vuetify's top padding for the floated label instead of pt-0.
• Rendered before/after with the same Vuetify components at sidebar width to confirm both.

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