feat(console): let an available update be dismissed (don't force the install)

[brettchien]

Problem

The updater button conflated find and install. Once Check for updates found a newer nightly, it flipped to Update to vX ↻ and the click handler became install-only:

el.addEventListener("click", () => void (pending ? install(...) : check(...)));

So once an update was found there was no way to skip it and keep working, and no way to re-check for a later nightly (clicking just installed the found one). The only exits from the pending state were install or restart — the operator was effectively forced to upgrade to whatever nightly it first saw.

Fix

Add a Later dismiss, shown only while an update is pending:

• index.html — a #update-dismiss button beside the update button.
• main.ts — setPending() toggles the dismiss with the pending state; the dismiss clears pending back to Check for updates and logs the skip. Install hides the dismiss while running. 1-click install is unchanged.
• styles.css — a quiet underlined .update-dismiss (muted → text on hover).

Finding an update now offers install or skip; skipping keeps the current build, and a later Check picks up whatever nightly is newest at that point.

Verification

console: tsc --noEmit clean · 89 vitest · vite build OK. The updater flow is desktop-only (Tauri bridge); this is a frontend-only change. Visual/interaction pass (find → Later → keeps build → re-check) wants eyes on a real build.

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