fix: resolve CI test failures on Linux and Windows

- Fix TestMigrateCommand: Use correct sqlite3 driver name and file URI format
- Fix TestDaemonAutoImportAfterGitPull: Add Windows-specific delay for filesystem timestamp precision
- Fix TestSyncBranchPull_Success: Add Windows-specific delay for file I/O settling

Amp-Thread-ID: https://ampcode.com/threads/T-5abd1f2f-9607-4111-af9d-19df64362ac7
Co-authored-by: Amp <amp@ampcode.com>

cmd/bd/migrate.go

@@ -512,13 +512,19 @@ func detectDatabases(beadsDir string) ([]*dbInfo, error) {
 }
 
 func getDBVersion(dbPath string) string {
-	// Open database read-only
-	db, err := sql.Open("sqlite", dbPath+"?mode=ro")
+	// Open database read-only using file URI (same as production code)
+	connStr := "file:" + dbPath + "?mode=ro&_time_format=sqlite"
+	db, err := sql.Open("sqlite3", connStr)
 	if err != nil {
 		return "unknown"
 	}
 	defer db.Close()
 
+	// Ping to ensure connection is actually established
+	if err := db.Ping(); err != nil {
+		return "unknown"
+	}
+
 	// Try to read version from metadata table
 	var version string
 	err = db.QueryRow("SELECT value FROM metadata WHERE key = 'bd_version'").Scan(&version)
@@ -526,6 +532,7 @@ func getDBVersion(dbPath string) string {
 		return version
 	}
 
+	// If the row doesn't exist but table does, this is still a database with metadata
 	// Check if metadata table exists
 	var tableName string
 	err = db.QueryRow(`
@@ -537,6 +544,11 @@ func getDBVersion(dbPath string) string {
 		return "pre-0.17.5"
 	}
 
+	// Table exists but version query failed (probably no bd_version key)
+	if err == nil {
+		return "unknown"
+	}
+
 	return "unknown"
 }