Chore remove promo

[HarshMN2345]

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[greptile-apps]

Greptile Summary

This PR removes the "Imagine" promotional banner that was displayed as a bottom modal alert in the cloud console. It deletes the four files that made up the promo (imagine.svelte, imagine.svg, shader.svelte, noise.glsl) and strips the corresponding registration logic from bottomAlerts.ts, leaving addBottomModalAlerts as an empty stub that preserves the existing call-site in bottomModalAlert.svelte for future promos.

Key observations:

• All deleted files are cleanly unreferenced after the change — no dangling imports were found.
• The isSameDay import retained in bottomAlerts.ts is still actively used by the isPromoLive utility function, so there is no unused-import issue.
• setMobileSingleAlertLayout (previously called for the Imagine promo's mobile layout) is no longer invoked, but its definition in $lib/stores/bottom-alerts.ts remains intact as general infrastructure — this is not a problem.
• The empty addBottomModalAlerts stub is called on mount in bottomModalAlert.svelte; calling an empty function is harmless and keeps the pattern ready for the next promotion.

Confidence Score: 5/5

Safe to merge — pure deletion of unused promo assets with no functional regressions.

All changes are straightforward deletions of promotional code and assets. No stale references remain, imports are clean, and the call-site in bottomModalAlert.svelte continues to work correctly with the empty stub. No P0/P1 issues found.

No files require special attention.

Important Files Changed

Filename	Overview
src/lib/components/promos/imagine.svelte	Deleted — promo component using Threlte Canvas and the Imagine SVG logo, no longer needed.
src/lib/components/promos/imagine.svg	Deleted — SVG asset for the Imagine promo banner, correctly removed alongside its consumer.
src/lib/components/promos/shader.svelte	Deleted — Threlte/Three.js shader component driving the animated background of the Imagine promo.
src/lib/components/promos/threlte/shaders/noise.glsl	Deleted — GLSL noise shader used by the Imagine promo shader component.
src/routes/(console)/bottomAlerts.ts	Promo logic stripped; addBottomModalAlerts is now a no-op stub. The isSameDay import is still valid — used by the remaining isPromoLive utility. No stale references remain.

_{Reviews (1): Last reviewed commit: "remove shaders" | Re-trigger Greptile}