Add What's New popup, Sparkle auto-update, and glassmorphism UI

[yhao3]

Summary

• Add What's New popup on first launch after update
• Integrate Sparkle framework for automatic updates
• Add unified glassmorphism UI design system
• Fix appearance theme immediate switching
• Fix label preview to match actual appearance

[yhao3]

Code review

Found 2 issues:

1. What's New window X button does not update lastSeenVersion: When user closes the What's New popup via the window's X button instead of clicking "Continue", the lastSeenVersion is not updated. This causes the popup to show again on every app launch until the user clicks the "Continue" button. The version update is only inside the button action (line 81), but dismissWindow() can be triggered by the X button without going through this path.

hinto/UI/WhatsNew/WhatsNewView.swift

Lines 79 to 85 in 040f63c

	if isPostUpdate {
	// Mark as seen only for post-update popup
	Preferences.shared.lastSeenVersion = Preferences.shared.currentVersion
	}
	onDismiss()
	}) {
	Text(isPostUpdate ? "Continue" : "Close")

2. Scripts/release.sh sets CFBundleVersion incorrectly: The script sets CFBundleVersion to the semantic version string (e.g., "0.2.0"), but validate-release-version.sh expects it to be a build number (e.g., "200" for version 0.2.0). Running the manual release script will cause validation to fail.

hinto/Scripts/release.sh

Lines 28 to 30 in 040f63c

	/usr/libexec/PlistBuddy -c "Set :CFBundleShortVersionString $VERSION" Resources/Info.plist
	/usr/libexec/PlistBuddy -c "Set :CFBundleVersion $VERSION" Resources/Info.plist

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[yhao3]

Fixed both issues:

• e38cbc0 Remove close button from What's New popup
• 2cbb94c Fix release.sh to use build number for CFBundleVersion