Enhance Discord emoji selection with Unicode support and improved UI

- Added support for Unicode emojis in the Discord emoji selector, allowing users to search and select from a comprehensive emoji library.
- Refactored the emoji selection component to include a category sidebar and skin tone options, improving user experience and accessibility.
- Updated localization files to include new emoji-related terms and categories in both English and German.
- Introduced a new dependency on `@emoji-mart/data` for better emoji management and search functionality.
- Enhanced the overall layout and functionality of the emoji picker, ensuring a more intuitive interface for users.

docs/PHASE-TRACKING.md

@@ -452,6 +452,7 @@
 - `DiscordRoleSelect` + Label/Beschreibung-Felder + `DiscordEmojiSelect` (Server-CDN + Unicode)
 - API `GET /api/guilds/[guildId]/emojis` inkl. Redis-Cache; Shared `DiscordEmojiOption`
 - Reaktions-Modus: Emoji je Rolle vor Save Pflicht
+- Emoji-Picker Discord-ähnlich: 9er-Grid, Kategorie-Sidebar, Vollsatz via `@emoji-mart/data`, Hautfarben, Suche
 
 ### Manuell testen
 
@@ -459,6 +460,7 @@
 - [ ] Dropdown: optionale Beschreibung erscheint in den Select-Optionen
 - [ ] REACTIONS ohne Emoji → Toast, kein Save
 - [ ] Bestehende Panels mit Custom-Emoji-Strings laden und editieren
+- [ ] Emoji-Picker: Kategorien scrollen, Suche, Hautfarbe, Server-Grid
 
 ## Nächster geplanter Schritt