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fix: remove the 750ms LiveView latency simulator in dev

The dev root layout called `liveSocket.enableLatencySim(750)` on every page
load. LiveView then held back every client message by 750ms, so every click
and form change in dev waited 750ms. The server was never slow.

This is the same change as #3901.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YBPF1knvgfghTSdxuYryGL