* fix(app): keep split dividers under the mouse before Explorer is first opened
The main row only left the Explorer pane out once the Explorer had been
shown, because the split container read the registered pane id directly.
Before that, the hidden Explorer stayed in the row with its share of the
sizes, and every divider drag moved about 1.28 times the mouse distance.
Resolve the pane the same way the workspace screen does, so the default
Explorer pane is left out from the start.
Closes#5998
* fix(app): keep split dividers under gesture input
Measure the gesture from its initial press so activation does not discard the movement before its threshold. Cover coarse-pointer mouse and touch input alongside app-created workspaces, Explorer changes and reload.
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Co-authored-by: paseo-bot[bot] <266920839+paseo-bot[bot]@users.noreply.github.com>
paseo-bot[bot]
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