feat(frontend): add Tiptap renovate group, i18n keys, fix geb. literal, remove rename-conflict

- renovate.json: group all @tiptap/* packages so version bumps stay in sync
- de/en/es.json: add transcription_editor_aria_label and person_born_name_prefix keys
- PersonHoverCard: replace hardcoded "geb." with m.person_born_name_prefix() (Leonie #5602)
- errors.ts: remove PERSON_RENAME_CONFLICT (backend enum value deleted)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

renovate.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "packageRules": [
+    {
+      "matchPackagePatterns": ["^@tiptap/"],
+      "groupName": "tiptap",
+      "automerge": false
+    }
+  ]
+}