slides: a refused deck snapshot says the deck is too large; the Share panel counts pictures still uploading

[nyblnet]

Slides side of #509, stacked on kernel-snap-assets (retargets to main once #509 merges).

• syncNoticeText: a too-large notice with snapshot: true (kernel's field for a refused whole-deck snapshot, which matches no op of ours) is worded "This deck is too large to share live in one piece. Your changes are saved in your copy, but a collaborator joining now may not receive the whole deck." — before the media branch; the change and image wordings are unchanged. After kernel: a relay snapshot strips large inline assets (photo-heavy decks share again) #509 a snapshot carries no inline pictures, so this now means the deck's own text/tables/small assets exceed the relay's frame ceiling (a comment says so).
• The toast on a snapshot refusal appends "N pictures are still uploading; they will follow." when session.pendingBlobUploads() > 0 — informational, stated in the code.
• The Share popover gains a "N pictures still uploading…" line: pendingBlobUploads() polled once a second only while the popover is open (the interval stops itself when the wrap closes; a rebuild clears the previous poll), hidden at 0, singular/plural via the existing key pattern, only while sharing is on.
• Rig scripts/test-slides-sync-notice.ts 21/21, registered in CI (snapshot before media; the kernel type is used, not widened; the poll's open-only lifecycle; every new string in all 8 core catalogs); 5 strings × 30 catalogs, coverage 100%; ci-registered 359; typecheck; build 653 KB.
• Chrome: the built shell boots; the new strings resolve through the compiled catalogs (2 pictures still uploading… / de 2 Bilder werden noch hochgeladen…). The popover line and the toast could not be driven live: the session instance is not reachable from the page (window.bento.sync is a facade) and turning sharing on reaches the real relay — their behaviour is source-pinned by the rig instead.
• Changelog line.

[github-actions]

Build size

kernel-snap-assets (ca7c108) → slides-sync-notice-wording (538ccb1)

app	base	PR	change
bento/slides	651.5 KiB	653.3 KiB	+1.8 KiB (+0.27%)
bento/spaces	264.6 KiB	264.6 KiB	0.0 KiB (0.00%)
bento/dash	406.4 KiB	406.4 KiB	0.0 KiB (0.00%)

Updated: 2026-09-17T21:46:20Z