Signal Reaction Fixes

This cluster addresses various issues related to signal handling, including case sensitivity and routing for group reactions.

11 PRs

fix signal Representative: #18511

#	Title	Author	Created	GitHub
7660	fix(signal): route group reactions to group sessions	ClawdadBot	2026-02-03	View
10958	fix: Signal UUID allowlist entries silently fail when sourceNumber is present	meaadore1221-afk	2026-02-07	View
12793	fix(signal): preserve case-sensitivity for group IDs, UUIDs, and usernames	wilmerdooley1-star	2026-02-09	View
14462	fix(messaging): preserve case in target normalization fallback (#14263)	lailoo	2026-02-12	View
16562	fix(signal): preserve case for group and username targets	akalypse	2026-02-14	View
17453	fix(signal): make group reactions deterministic from inbound sender metadata	akalypse	2026-02-15	View
17818	Fix Signal reaction notification missing sender (support legacy 'source' field)	Clawborn	2026-02-16	View
18511	fix(signal): signal:-prefixed phone numbers fail target resolution (#18495) rep	yinghaosang	2026-02-16	View
19190	Signal: preserve group ID casing in session keys	clzoc	2026-02-17	View
19358	test(signal): add E.164 format acceptance for signal target detection	saurav470	2026-02-17	View
20722	fix(signal): use correct JSON-RPC param names for sendReaction	arjunblj	2026-02-19	View