Rename iPad Mini to iPad mini for Apple naming consistency

[Copilot]

• Update Source/Device.swift.gyb to change "iPad Mini" to "iPad mini" in strings and comments (lines 120-126)
• Regenerate Source/Device.generated.swift using the gyb tool
• Update Tests/Tests.swift to match new "iPad mini" string values (lines 358-362)
• Update CHANGELOG.md to reflect "iPad mini" naming (4 occurrences)
• Add changelog entry under Unreleased for iPad mini naming fix
• Run code review
• Run CodeQL security scan

Original prompt

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This section details on the original issue you should resolve

<issue_title>iPad Mini vs. iPad mini</issue_title>
<issue_description>Thank you for creating this amazing library.

If anyone is excited by nitpicky details, for consistency with Apple's naming, the capitalization of "iPad Mini" should be "iPad mini".

See Device.swift.gyb, lines 120 through 126

DeviceKit/Source/Device.swift.gyb

Line 120 in 55ad16f

Device("iPadMini", "Device is an [iPad Mini](https://support.apple.com/kb/SP661)", "https://support.apple.com/library/APPLE/APPLECARE_ALLGEOS/SP661/sp661_ipad_mini_color.jpg", ["iPad2,5", "iPad2,6", "iPad2,7"], 7.9, (3, 4), "iPad Mini", "iPad Mini", 163, False, True, False, False, False, False, False, False, False, False, 0, False, 1, False, "a5", False, False),

Please let me know if you'd like me to create a PR for this issue.</issue_description>

<agent_instructions>Rename all iPad Mini to iPad mini with lowercase m. Only inside strings and comments. Keep the enum still with capital M according to lowerCamelCasing.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes iPad Mini vs. iPad mini #458

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