Unified OAuth for external MCP servers and hooks dashboard

This release unifies the OAuth configuration pathway for external MCP servers and adds a dedicated dashboard page for managing hooks.

Features

• Unified OAuth for external MCP servers #1797  - External MCP servers now use the same OAuth configuration pathway as all other toolsets, removing special-cased token resolution. The “Configure OAuth” button is enabled for external MCP servers that require OAuth, and discovered OAuth metadata can auto-populate the configuration form with a single click. (Author: @qstearns )
• Hooks dashboard page #1767  - Added a dedicated dashboard page for viewing and managing hooks. (Author: @chase-crumbaugh )