Kepo app and plugin updates

Kept the public Mac download target aligned with the current Apple Silicon client release.

• Current stable Mac app version is v1.1.11.
• Download metadata points to the matching arm64 DMG package.
• Client release information is exposed consistently on the download page and changelog.

Added Product Hunt as a new widget source for users who track product launches from the desktop.

• Added Product Hunt-oriented data source work for launch discovery widgets.
• Prepared public plugin surfaces around product launch tracking.
• Connected the new source to desktop widget use cases.

Expanded the plugin ecosystem with Product Hunt and YouTube widgets, and improved plugin store browsing.

• Added Product Hunt widgets for launch discovery workflows.
• Added YouTube widgets for channel updates and notification-style checks.
• Localized plugin store categories and refreshed plugin discovery surfaces.

Improved the desktop panel experience around running widgets and made public plugin pages clearer.

• Improved how widgets behave when opened and managed from the panel.
• Updated public plugin pages so users can understand plugin status and details faster.
• Reduced friction around moving from a plugin page to an installed desktop widget.

Added and refined small utility widgets for daily desktop workflows.

• Completed the Calculator plugin for quick desktop calculations.
• Improved the Pomodoro Clock plugin interface.
• Added utility plugin improvements for common desktop tasks.

Added Bilibili widgets and updated plugin release metadata for the desktop plugin ecosystem.

• Added Bilibili widget support.
• Improved runtime diagnostics used by plugin widgets.
• Published test-provider trigger updates and refreshed plugin versions.

Added Weibo plugin support and improved diagnostics for plugin execution issues.

• Added Weibo plugin coverage for hot search and social monitoring scenarios.
• Added runtime diagnostics to make plugin behavior easier to inspect.
• Improved the foundation for troubleshooting plugin widget execution.

Improved desktop client behavior around popup browser appearance and panel switching.

• Optimized popup browser appearance in the Mac app.
• Improved panel switching behavior.
• Prepared macOS arm64 packaging and release validation work.