Cache getters to avoid redundant recompilation

[rameel]

No description provided.

[github-actions]

📦 Bundle size comparison

Name	Size	Gzip	Brotli	Δ
alpinegear-when.min.js	1.22 KiB	657 B	570 B
alpinegear-when.esm.min.js	1.15 KiB	625 B	548 B
alpinegear-typegrab.min.js	509 B	348 B	294 B
alpinegear-typegrab.esm.min.js	471 B	333 B	277 B
alpinegear-template.min.js	483 B	326 B	246 B
alpinegear-template.esm.min.js	421 B	294 B	219 B
alpinegear-router.min.js	9.42 KiB	4.04 KiB	3.60 KiB
alpinegear-router.esm.min.js	9.40 KiB	4.02 KiB	3.59 KiB
alpinegear-match.min.js	1.49 KiB	778 B	681 B
alpinegear-match.esm.min.js	1.43 KiB	748 B	660 B
alpinegear-main.min.js	7.03 KiB (+102 B)	2.85 KiB (+28 B)	2.51 KiB (+26 B)	🔴
alpinegear-main.esm.min.js	7.06 KiB (+102 B)	2.89 KiB (+25 B)	2.55 KiB (+20 B)	🔴
alpinegear-hotkey.min.js	2.02 KiB	1.10 KiB	975 B
alpinegear-hotkey.esm.min.js	1.96 KiB	1.07 KiB	958 B
alpinegear-fragment.min.js	1.02 KiB	552 B	484 B
alpinegear-fragment.esm.min.js	980 B	521 B	457 B
alpinegear-format.min.js	1.20 KiB (+102 B)	667 B (+29 B)	578 B (+24 B)	🔴
alpinegear-format.esm.min.js	1.14 KiB (+102 B)	632 B (+29 B)	549 B (+22 B)	🔴
alpinegear-dialog.min.js	1.79 KiB	967 B	822 B
alpinegear-dialog.esm.min.js	1.75 KiB	951 B	811 B
alpinegear-destroy.min.js	191 B	167 B	123 B
alpinegear-destroy.esm.min.js	128 B	123 B	91 B
alpinegear-bound.min.js	3.95 KiB	1.82 KiB	1.58 KiB
alpinegear-bound.esm.min.js	3.91 KiB	1.79 KiB	1.56 KiB

[Copilot]

Pull request overview

This PR optimizes the x-format directive’s attribute processing by caching compiled expression getters, reducing redundant evaluateLater recompilation work during reactive updates.

Changes:

• Precompute a per-attribute Map of placeholder expression → compiled getter.
• Reuse cached getters inside the reactive update() callback instead of recompiling on every update.

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