feat(ui): add relationship management features in schema editor

- Implement functionality to create, update, delete, and view relationships between tables.
- Introduce new UI screens for managing relationships, including forms for adding and editing relationships.
- Enhance table editor with navigation to relationship management.
- Ensure relationships are displayed in a structured table format for better usability.

pkg/readers/sqlite/reader.go

@@ -187,35 +187,35 @@ func (r *Reader) close() {
 func (r *Reader) mapDataType(sqliteType string) string {
 	// SQLite has a flexible type system, but we map common types
 	typeMap := map[string]string{
-		"INTEGER":  "int",
-		"INT":      "int",
-		"TINYINT":  "int8",
-		"SMALLINT": "int16",
-		"MEDIUMINT": "int",
-		"BIGINT":   "int64",
-		"UNSIGNED BIG INT": "uint64",
-		"INT2":     "int16",
-		"INT8":     "int64",
-		"REAL":     "float64",
-		"DOUBLE":   "float64",
-		"DOUBLE PRECISION": "float64",
-		"FLOAT":    "float32",
-		"NUMERIC":  "decimal",
-		"DECIMAL":  "decimal",
-		"BOOLEAN":  "bool",
-		"BOOL":     "bool",
-		"DATE":     "date",
-		"DATETIME": "timestamp",
-		"TIMESTAMP": "timestamp",
-		"TEXT":     "string",
-		"VARCHAR":  "string",
-		"CHAR":     "string",
-		"CHARACTER": "string",
+		"INTEGER":           "int",
+		"INT":               "int",
+		"TINYINT":           "int8",
+		"SMALLINT":          "int16",
+		"MEDIUMINT":         "int",
+		"BIGINT":            "int64",
+		"UNSIGNED BIG INT":  "uint64",
+		"INT2":              "int16",
+		"INT8":              "int64",
+		"REAL":              "float64",
+		"DOUBLE":            "float64",
+		"DOUBLE PRECISION":  "float64",
+		"FLOAT":             "float32",
+		"NUMERIC":           "decimal",
+		"DECIMAL":           "decimal",
+		"BOOLEAN":           "bool",
+		"BOOL":              "bool",
+		"DATE":              "date",
+		"DATETIME":          "timestamp",
+		"TIMESTAMP":         "timestamp",
+		"TEXT":              "string",
+		"VARCHAR":           "string",
+		"CHAR":              "string",
+		"CHARACTER":         "string",
 		"VARYING CHARACTER": "string",
-		"NCHAR":    "string",
-		"NVARCHAR": "string",
-		"CLOB":     "text",
-		"BLOB":     "bytea",
+		"NCHAR":             "string",
+		"NVARCHAR":          "string",
+		"CLOB":              "text",
+		"BLOB":              "bytea",
 	}
 
 	// Try exact match first