fix: orchestrator button + Pi SDK session error

- Move leftSidebarMode from URL state to local useState in unified-shell,
    avoiding force-dynamic router round-trip that made the button appear broken                                           - Replace fileURLToPath(new URL(..., import.meta.url)) with process.cwd()
    in bb-pi-bootstrap.ts — import.meta.url is a webpack:// URL in Next.js,
    causing cross-realm TypeError when passed to Node.js fileURLToPath()

.gitignore

@@ -50,3 +50,7 @@ test-*.ts
 .qodo/
 .gemini/
 .kilocode/
+
+# Dolt database files (added by bd init)
+.dolt/
+*.db