Searching on chats should be ascent insensitive

• 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

Searching on chats should be ascent insensitive, just like Signal Desktop. This will help all international users that use ascents in their languages, locate names and messages.

Steps to reproduce

• Type a word on the search bar without using ascent character(s)
• The search should locate words that use the same character(s) with or without ascent characters

Actual result: Search locates the word only when using exactly the same character (ascent or non ascent).

Expected result: Search should locate words spelled with both ascent and non-ascent characters

Screenshots

Device info

Device: iPhone 13

iOS version: 18.7.2

Signal version: 7.93 (1322)

Link to debug log

The report identifies the iOS search bar and chat search, but names no source files or tests. Reproduce the accent-sensitive search on the stated iPhone/iOS setup, then trace the chat-search implementation and its existing tests. Done means searches with accented and unaccented forms locate the same words without breaking exact searches.