Certain stickers missing from search

• I have searched open and closed issues for duplicates
• I am submitting a bug report for existing functionality that does not work as intended
• This isn't a feature request or a discussion topic

Bug description

Certain stickers can be missing from the sticker search results.

This bug is consistently reproducible across all platforms (Desktop, Android & iOS), and appears to be an issue where the emoji string as defined in the sticker pack does not exactly match the emoji codepoint sequence as defined in Signal. (for example, it appears some of the sticker packs I have have the emoji defined without the variant selector character (U+FE0F) that forces colour presentation, whereas Signal's emoji definitions expect the FE0F to be present.)

Steps to reproduce

1. Add the following sticker pack: https://signal.art/addstickers#pack_id=4ecdd78d860cb91aad6efb3dfbb326d8&pack_key=9cb0fb73874e68ee5b969e24585f1461557542418fb09011d4c91b64c2ef1bb4
2. Enter the '🛏' emoji from the keyboard.
3. Note that, how even though that pack contains a sticker for '🛏', it is missing from the search results.

Actual result: No sticker suggestion is given. However, if you instead type '🛏' (yes - this technically is a different character), you will see the suggestion.

Expected result: Sticker suggestion is shown.

Device info

Device: iPhone 16 Pro Max

iOS version: 17.0

Signal version: 8.25 (1809)

Start by reproducing the issue in Signal-iOS with the linked sticker pack and the reported bed emoji variants. Trace the sticker search path to see how emoji strings are compared, then verify that equivalent codepoint sequences return the sticker. Done means the pack’s sticker appears for the keyboard-entered emoji without breaking existing sticker search.