feat(structures): add StickerPack structure

[AsadHumayun]

This PR will add the StickerPack structure.

createdAt and createdTimestamp were missing on the Sticker structure, so I went ahead and added that as part of this PR as well. We should be able to derive these properties as a snowflake id is present for that structure.

This PR does not add tests.

Mentioning #10981 for visibility.

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2 Skipped Deployments

Project	Deployment	Review	Updated (UTC)
discord-js	Skipped		Jan 27, 2026 11:03pm
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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request introduces a new StickerPack class to expose sticker pack data through typed getters and timestamp utilities, while extending the Sticker class with createdTimestamp and createdAt getters that derive creation time from the Snowflake ID.

Changes

Cohort / File(s)	Summary
New StickerPack Implementation packages/structures/src/stickers/StickerPack.ts, packages/structures/src/stickers/index.ts	Introduces StickerPack class extending Structure with 8 public getters (id, name, skuId, coverStickerId, description, bannerAssetId, createdTimestamp, createdAt). Exports class via index. Includes timestamp derivation from Snowflake ID via DiscordSnowflake utility.
Sticker Timestamp Enhancements packages/structures/src/stickers/Sticker.ts	Adds createdTimestamp and createdAt getters to existing Sticker class. Both derive values from Snowflake ID when valid, otherwise return null.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main objective of adding a StickerPack structure to the codebase.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The pull request description clearly outlines the changes: adding StickerPack structure and createdAt/createdTimestamp to Sticker, with rationale for missing snowflake-derived properties.

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✨ Finishing touches

• 📝 Generate docstrings

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 31.80%. Comparing base (693fcbc) to head (d6e7624).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/structures/src/stickers/StickerPack.ts	0.00%	20 Missing ⚠️
packages/structures/src/stickers/Sticker.ts	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11398      +/-   ##
==========================================
- Coverage   31.86%   31.80%   -0.06%     
==========================================
  Files         379      380       +1     
  Lines       13813    13838      +25     
  Branches     1089     1093       +4     
==========================================
  Hits         4401     4401              
- Misses       9278     9303      +25     
  Partials      134      134              

Flag	Coverage Δ
structures	37.78% <0.00%> (-0.72%)	⬇️

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