Visual Table Designer & Productivity Enhancements

[ric-v]

This pull request delivers a major feature update for PgStudio, introducing visual schema editing tools, new productivity enhancements, and technical roadmap updates. The most important changes are the addition of a Visual Table Designer, Index & Constraint Manager, Smart Paste functionality, and new dashboard diagnostics. Documentation and roadmap files are updated to reflect these new capabilities and future technical priorities.

Major Feature Additions:

• Visual Table Designer: Enables robust, interactive creation and editing of tables, columns, constraints, and foreign keys without writing SQL. [1] [2] [3] [4] [5]
• Visual Index & Constraint Manager: Provides a modern GUI to manage indexes and constraints, analyze usage, and drop unused indexes. [1] [2] [3] [4] [5]
• Smart Paste: Intelligent clipboard handling for SQL, CSV, and JSON, offering context-aware actions such as "Insert as Rows" and "Format SQL". [1] [2] [3] [4] [5]

Dashboard & Productivity Enhancements:

• Dashboard Diagnostics: Adds a Visual Lock Viewer, real-time IO metrics, and active query management (kill/cancel) directly from the dashboard. [1] [2]
• New commands for quick table cloning, exporting, and schema diffing are integrated into the extension UI and command palette. [1] [2] [3] [4]

Documentation & Roadmap Updates:

• Updated CHANGELOG.md, README.md, and new docs (VISUAL_TOOLS.md, ROADMAP_PROPOSAL.md) to describe new features and strategic direction. [1] [2] [3] [4]
• Refined technical roadmap to prioritize security hardening (parameterized queries, atomic batch operations), architectural refactoring, and E2E testing. [1] [2] [3]

Miscellaneous Improvements:

• Version bump to 0.8.4 across all relevant files. [1] [2]
• Updated UI highlights and feature cards in docs/index.html to showcase new visual tools.

These changes significantly enhance PgStudio's usability, safety, and competitive positioning as a developer-focused database management tool.