merge: upstream cinny v4.12.7 into lotus

Brings the 4.12.7 fixes: "%" sign wrapping below the composer input and
emoji autocompletion overwriting the preceding element. The release's
security half (sanitize-html, react-router-dom) was already applied in
91def3ad (we are on newer versions than upstream ships).

Resolved: kept our package.json/lockfile (the fork is ahead on every
dependency — React 19, router 7, i18next 26…), version 4.12.7-lotus, our
README/CONTRIBUTING, our "Lotus Chat vN" branding via pkg.version, and
the deleted GitHub-only workflows stay deleted. Note upstream announces
it is replacing matrix-js-sdk with its own SDK and pausing PRs; future
syncs will get harder.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/app/features/room/RoomInput.tsx

@@ -44,7 +44,7 @@ import {
   AutocompletePrefix,
   AutocompleteQuery,
   getAutocompleteQuery,
-  getPrevWorldRange,
+  getPrevWordRange,
   resetEditor,
   RoomMentionAutocomplete,
   UserMentionAutocomplete,
@@ -806,7 +806,7 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
           sendTypingStatus(!isEmptyEditor(editor));
         }
 
-        const prevWordRange = getPrevWorldRange(editor);
+        const prevWordRange = getPrevWordRange(editor);
         const query = prevWordRange
           ? getAutocompleteQuery<AutocompletePrefix>(editor, prevWordRange, AUTOCOMPLETE_PREFIXES)
           : undefined;

src/app/features/room/message/MessageEditor.tsx

@@ -35,7 +35,7 @@ import {
   createEmoticonElement,
   customHtmlEqualsPlainText,
   getAutocompleteQuery,
-  getPrevWorldRange,
+  getPrevWordRange,
   htmlToEditorInput,
   moveCursor,
   plainToEditorInput,
@@ -281,7 +281,7 @@ export const MessageEditor = as<'div', MessageEditorProps>(
           return;
         }
 
-        const prevWordRange = getPrevWorldRange(editor);
+        const prevWordRange = getPrevWordRange(editor);
         const query = prevWordRange
           ? getAutocompleteQuery<AutocompletePrefix>(editor, prevWordRange, AUTOCOMPLETE_PREFIXES)
           : undefined;