fix(ui): show project names exactly as the folder is named

Auto-derived project labels were title-cased, turning .ssh into .Ssh and
opencode-claude into Opencode Claude. Show the folder name verbatim in the
sidebar, window title, settings selector and notification templates, and
migrate persisted legacy labels back to the folder name (manual renames
are preserved).

packages/ui/src/components/session/sidebar/utils.tsx

@@ -156,11 +156,8 @@ export const resolveArchivedFolderName = (session: Session, projectRoot: string
   return segments[segments.length - 1] ?? 'unassigned';
 };
 
-export const formatProjectLabel = (label: string): string => {
-  return label
-    .replace(/[-_]/g, ' ')
-    .replace(/\b\w/g, (char) => char.toUpperCase());
-};
+// Folder names are shown exactly as they are on disk — no title-casing.
+export const formatProjectLabel = (label: string): string => label.trim();
 
 export const renderHighlightedText = (text: string, query: string): React.ReactNode => {
   if (!query) {