FOLLOW-UP: Resolve data-lvt-target at setup time in setupFxDOMEventTriggers (from PR #94)

[adnaan]

Context

This follow-up task was identified during the review of PR #94.

Source PR: #94
PR Title: feat: scroll enhancements — data-lvt-target for scroll effects, lvt-scroll-away, bottom-sticky first-run
Suggested by: @claude[bot]

Task Description

In setupFxDOMEventTriggers, resolveTarget(el) is called on every event fire (click, keydown, etc.) rather than once at setup time. Since resolveTarget is a simple querySelector/closest call, this is low-cost, but resolving at setup time would:

1. Match the pattern used in scroll-away.ts
2. Avoid repeated DOM queries on high-frequency events like mouseenter

Low priority — resolveTarget is cheap and the current approach handles dynamic DOM correctly.

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This issue was automatically created by prmonitor from PR review comments.