feat: Remove unused 'finalizing' phase from indexing progress

Eliminates the intermediate 'finalizing' phase that was added as a progress bar transition state but served no functional purpose. Simplifies the progress flow by going directly from 'storing' to 'resolving' phases, removing associated UI labels and progress callbacks.

src/ui/shimmer-progress.ts

@@ -5,7 +5,6 @@ const PHASE_NAMES: Record<string, string> = {
   scanning: 'Scanning files',
   parsing: 'Parsing code',
   storing: 'Storing data',
-  finalizing: 'Finalizing',
   resolving: 'Resolving refs',
 };