feat(ui): 🎨 Implement schema and table management screens

* Add schema management screen with list and editor
* Implement table management screen with list and editor
* Create data operations for schema and table management
* Define UI rules and guidelines for consistency
* Ensure circular tab navigation and keyboard shortcuts
* Add forms for creating and editing schemas and tables
* Implement confirmation dialogs for destructive actions

pkg/ui/column_dataops.go

@@ -0,0 +1,95 @@
+package ui
+
+import "git.warky.dev/wdevs/relspecgo/pkg/models"
+
+// Column data operations - business logic for column management
+
+// CreateColumn creates a new column and adds it to a table
+func (se *SchemaEditor) CreateColumn(schemaIndex, tableIndex int, name, dataType string, isPrimaryKey, isNotNull bool) *models.Column {
+	table := se.GetTable(schemaIndex, tableIndex)
+	if table == nil {
+		return nil
+	}
+
+	if table.Columns == nil {
+		table.Columns = make(map[string]*models.Column)
+	}
+
+	newColumn := &models.Column{
+		Name:         name,
+		Type:         dataType,
+		IsPrimaryKey: isPrimaryKey,
+		NotNull:      isNotNull,
+	}
+	table.UpdateDate()
+	table.Columns[name] = newColumn
+	return newColumn
+}
+
+// UpdateColumn updates an existing column's properties
+func (se *SchemaEditor) UpdateColumn(schemaIndex, tableIndex int, oldName, newName, dataType string, isPrimaryKey, isNotNull bool, defaultValue interface{}, description string) bool {
+	table := se.GetTable(schemaIndex, tableIndex)
+	if table == nil {
+		return false
+	}
+
+	column, exists := table.Columns[oldName]
+	if !exists {
+		return false
+	}
+
+	table.UpdateDate()
+
+	// If name changed, remove old entry and create new one
+	if oldName != newName {
+		delete(table.Columns, oldName)
+		column.Name = newName
+		table.Columns[newName] = column
+	}
+
+	// Update properties
+	column.Type = dataType
+	column.IsPrimaryKey = isPrimaryKey
+	column.NotNull = isNotNull
+	column.Default = defaultValue
+	column.Description = description
+
+	return true
+}
+
+// DeleteColumn removes a column from a table
+func (se *SchemaEditor) DeleteColumn(schemaIndex, tableIndex int, columnName string) bool {
+	table := se.GetTable(schemaIndex, tableIndex)
+	if table == nil {
+		return false
+	}
+
+	if _, exists := table.Columns[columnName]; !exists {
+		return false
+	}
+
+	table.UpdateDate()
+
+	delete(table.Columns, columnName)
+	return true
+}
+
+// GetColumn returns a column by name
+func (se *SchemaEditor) GetColumn(schemaIndex, tableIndex int, columnName string) *models.Column {
+	table := se.GetTable(schemaIndex, tableIndex)
+	if table == nil {
+		return nil
+	}
+
+	return table.Columns[columnName]
+}
+
+// GetAllColumns returns all columns in a table
+func (se *SchemaEditor) GetAllColumns(schemaIndex, tableIndex int) map[string]*models.Column {
+	table := se.GetTable(schemaIndex, tableIndex)
+	if table == nil {
+		return nil
+	}
+
+	return table.Columns
+}