docs: track Telegram blurry fullscreen animated emoji (upstream)

backlogs/short_term_backlog.md

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+Fullsize avatar and gradient positions...
 Main screen scrolling on mobile
 Swiping down stick "Feed..." header
 Coins in the coins section including those from TON Connect
@@ -188,6 +189,7 @@ Selection and pointing text detalization<br>
     on word tapping places at the end of the word<br>
     zoom-in cursor placing on long tap<br>
 Instructions.ts in AI<br>
+Upstream Telegram: fullscreen animated/custom emoji opens blurry (low-res thumbnail upscaled) — track in docs/telegram-upstream/ + GitHub issues on Desktop/iOS/Web; Android GitHub issues disabled<br>
 
 Abandoned:<br>
 Placeholder refactor<br>

docs/telegram-upstream/animated-emoji-fullscreen-quality.md

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+# Telegram: fullscreen / enlarged animated emoji is blurry
+
+## Summary
+
+When opening a Telegram **animated / custom emoji** in the full-size media viewer, Telegram often shows a **low-resolution raster thumbnail** scaled up. The result looks blurry and pixelated, even though the emoji itself is vector/Lottie (`.tgs`) or has a higher-quality asset available.
+
+This is a **Telegram client UX/rendering issue**, not a Hyperlinks Space Program bug. We are tracking it here and reporting it upstream for every official open-source client that accepts GitHub issues.
+
+## Expected
+
+Opening an animated/custom emoji full-size should either:
+
+1. Play the **full Lottie / `.tgs` animation** at a crisp large size, or
+2. Show a **high-resolution still** (or retina-scale preview) instead of upscaling the small inline thumbnail.
+
+## Actual
+
+The media viewer enlarges the **small inline preview** (often ~100×100 or similar). Edges become jagged and the image looks soft/blurry.
+
+## Evidence
+
+![Blurry fullscreen animated emoji in Telegram media viewer](./animated-emoji-fullscreen-blurry.png)
+
+Observed on Telegram Desktop (Windows): media viewer titled like a photo (“Photo 1 of 3”), showing a custom emoji pack asset at full size with visible pixelation.
+
+## Platforms
+
+| Platform | Upstream issue | Notes |
+|----------|----------------|-------|
+| Desktop (Windows / Linux / macOS) | [tdesktop#31158](https://github.com/telegramdesktop/tdesktop/issues/31158) | Primary repro in screenshot |
+| iOS | [Telegram-iOS#2296](https://github.com/TelegramMessenger/Telegram-iOS/issues/2296) | Related: large emoji Retina blur ([#2292](https://github.com/TelegramMessenger/Telegram-iOS/issues/2292)) |
+| Android | — | [DrKLO/Telegram](https://github.com/DrKLO/Telegram) has **GitHub Issues disabled** — report via in-app / Telegram support |
+| Telegram Web K | [telegram-tt#538](https://github.com/Ajaxy/telegram-tt/issues/538) | Same media-viewer thumbnail-upscale report |
+| Telegram Web A | [tweb#701](https://github.com/morethanwords/tweb/issues/701) | Same media-viewer thumbnail-upscale report |
+
+Hyperlinks Space tracking: [#92](https://github.com/HyperlinksSpace/HyperlinksSpaceProgram/issues/92)
+
+## Suggested fix (for client engineers)
+
+When the user opens an animated/custom emoji in the media viewer:
+
+- Prefer the **document / Lottie animation** (or largest available preview) over the **inline emoji cache thumbnail**.
+- On HiDPI screens, request / paint **2× (or devicePixelRatio) sized** previews so upscaling is not required.
+- Do not treat custom emoji open-in-viewer as a generic photo open that sticks to the smallest cached bitmap.
+
+## Hyperlinks Space
+
+Filed from [HyperlinksSpace](https://github.com/HyperlinksSpace) / [HyperlinksSpaceProgram](https://github.com/HyperlinksSpace/HyperlinksSpaceProgram) so our Telegram messaging UX work can link official client bugs.
+
+Client forks (for future fix PRs): [`tdesktop`](https://github.com/HyperlinksSpace/tdesktop), [`Telegram-iOS-1`](https://github.com/HyperlinksSpace/Telegram-iOS-1), [`telegram-tt`](https://github.com/HyperlinksSpace/telegram-tt), [`tweb`](https://github.com/HyperlinksSpace/tweb).