fix(v2): escape XML special characters in macOS plist generation

[leaanthony]

Summary

When wails.json contains special characters like & in fields such as info.copyright, the generated Info.plist becomes invalid XML, breaking macOS packaging (broken app icon, launch failures).

The root cause is that resolveProjectData() in buildassets.go uses text/template, which performs no escaping. Switching to html/template ensures &, <, >, " are properly escaped in the plist output.

Before: "Joe & Bill, Inc." → "Joe & Bill, Inc." (invalid XML)
After: "Joe & Bill, Inc." → "Joe & Bill, Inc." (valid XML)

Fixes #4865

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