feat(web): add GitHub star giveaway notification

[markijbema]

Summary

Adds the GitHub star giveaway announcement as a server-side notification in the cloud platform, where client-facing notifications belong — rather than hardcoding it into the VS Code extension webview (as done in kilocode#11379).

• Adds a star-giveaway-june-2026 entry to the static notification list in apps/web/src/lib/notifications.ts, served via GET /api/users/notifications to the extension and CLI.
• Message: "We're giving away $500 of AI Credits when we reach 25,000 stars on GitHub. Support us:" with an action linking to https://github.com/Kilo-Org/kilocode/
• Because it flows through the centralized notification system, it ships to existing clients without an extension release, is dismissible by id like any other notification, and can be edited/removed server-side.

Verification

• Visit a logged-in account and confirm the notification appears in the extension/CLI notification list and is dismissible.
• Confirm the action link opens https://github.com/Kilo-Org/kilocode/

Visual Changes

N/A

Reviewer Notes

• No expiresAt is set, mirroring the source PR (shows until dismissed). The existing entries generally favor an expiry to auto-hide server-side — happy to add one (e.g. end of July) if preferred.
• No showIn is set, so it targets all clients with notification support.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Reviewed the single-file addition of a star-giveaway-june-2026 static notification; the entry matches the KiloNotification shape, uses a unique id, and introduces no memory leaks or runtime risks.

Files Reviewed (1 file)

• apps/web/src/lib/notifications.ts — added one entry to normalUnconditionalNotifications

Notes (not blockers)

• No expiresAt is set, so the notification persists until dismissed server-side. This is consistent with several existing entries (kilo-cli-jan-5, kilo-cloud-agents-jan-15, kilo-console-beta, kilo-pass-announcement-jan-12) and is already acknowledged in the PR's Reviewer Notes.
• No showIn is set, so it surfaces in all clients with notification support. Also called out in Reviewer Notes.
• No new closures, event listeners, or module-scope I/O clients are introduced — no memory-leak concerns.

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_{Reviewed by glm-5.2-20260616 · 211,173 tokens}

_{Review guidance: REVIEW.md from base branch main}