Fix live sidebar resize limits and defer Alchemy runtime context

[juliusmarminge]

Summary

• Track viewport width changes so sidebar resize limits update live.
• Resolve Alchemy runtime context through Effect layers when Cloudflare bindings are used.
• Simplify worker layer wiring and remove obsolete runtime-context construction tests.

Testing

• Not run.

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Note

Low Risk
Small UI/layout change in sidebar sizing with no auth, data, or API impact.

Overview
Thread sidebar resize limits now follow live window width instead of a one-time window.innerWidth read on render.

AppSidebarLayout subscribes to viewport width via useSyncExternalStore and a resize listener, then passes that value into resolveThreadSidebarMaximumWidth for the sidebar resizable.maxWidth. That fixes cases where the max clamp stayed stale after resize—or when a drag ended clamped without changing width, so no re-render refreshed the old snapshot.

^{Reviewed by Cursor Bugbot for commit efe6301. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix live sidebar resize limits by subscribing to viewport width changes in AppSidebarLayout

Previously, sidebarMaximumWidth was computed once at mount using window.innerWidth, so resizing the browser window had no effect. This replaces the one-time read with useSyncExternalStore, subscribing to window resize events so sidebarMaximumWidth stays current as the viewport changes.

^{Macroscope summarized efe6301.}

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[macroscopeapp]

Approvability

Verdict: Approved

Straightforward bug fix using standard React patterns to make sidebar width constraints respond to window resizes. Self-contained UI change with no security or schema implications.

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