v0.5.3: docs: release version 0.5.3

New features

• Added ChunkMapView to visualize active segmented downloads using aria2 RPC with minimal performance overhead.
• Added seamless drag-and-drop support for URLs and text files in the main window and dock icon.

Changes

• Refactored all Settings panes to use standard macOS HIG Form and .toolbar layouts.
• Updated the "Add Downloads" dialog to use native macOS .toolbar with integrated cancel actions.

Fixes

• Fixed a DNS rebinding vulnerability by rigorously validating the Host header within the local extension server.
• Fixed a potentially unbounded memory leak in the download console buffer by introducing a strict 512KB cap.
• Fixed an intermittent UI hang during the aria2c version check by fully decoupling the process execution into a detached background task.