feat(FN-679): regenerate PROMPT.md on task title/description updates

- Implement automatic PROMPT.md regeneration in updateTask() when title or description changes
- Add comprehensive tests for PROMPT.md sync behavior in store.test.ts
- Create changeset for the PROMPT.md sync fix
- Remove multi-project migration changeset (superseded)
- Update dashboard components and styles for setup wizard and provider icons

packages/core/src/db.ts

@@ -101,7 +101,8 @@ CREATE TABLE IF NOT EXISTS tasks (
   mergeDetails TEXT,
   breakIntoSubtasks INTEGER DEFAULT 0,
   enabledWorkflowSteps TEXT DEFAULT '[]',
-  modifiedFiles TEXT DEFAULT '[]'
+  modifiedFiles TEXT DEFAULT '[]',
+  sliceId TEXT
 );
 
 -- Config table (single row with project settings)