Architecture refactor

[ric-v]

This pull request delivers a major update to the PgStudio (PostgreSQL Explorer) extension, focused on architecture refactoring, improved user experience, and new features for query history and release notes. It completes Phase 3 of the roadmap, introduces a robust service layer, modularizes the codebase, and adds several new commands and UI views for enhanced productivity and safety.

Architecture & Codebase Refactoring

• Completed Phase 3 refactoring: Split large files like extension.ts and tables.ts into focused modules (commands/, providers/, services/, operations.ts, scripts.ts, maintenance.ts) for better maintainability and scalability.
• Implemented a hybrid connection pooling strategy (pg.Pool for ephemeral, pg.Client for sessions) and introduced a service layer with QueryHistoryService, ErrorService, and SecretStorageService.

New Features & UI Enhancements

• Added a "What's New" welcome screen that displays release notes on update, and a manual command to view changelog history. [1] [2]
• Introduced a Query History view with commands to clear history, copy queries, open queries, and delete history items. [1] [2]
• Added keyboard shortcuts for common actions (new notebook, add connection, dashboard, query tool) for faster workflow.
• Enhanced markdown rendering in changelog and query result views, including syntax highlighting. [1] [2]

Settings & Configuration

• Added new configuration options: global query timeout, connection grouping, and improved telemetry opt-in. [1] [2]

Roadmap Updates

• Updated the roadmap to reflect completion of Phase 3 and outlined upcoming safety, productivity, and AI features (e.g., prod-aware query confirmation, read-only mode, query history with rerun/diff, table intelligence, safer AI suggestions).

Versioning

• Bumped extension version to 0.7.5 to reflect these significant changes.

References:
[1] [2] [3] [4] [5]