facet-rs / facet / 19922893780

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feat: add VSafeString for HTML-safe strings

Add a VSafeString type for template engines that need to mark strings
as "safe" (pre-escaped HTML that shouldn't be escaped again).

Implementation uses the high bit of StringHeader.len as a safe flag,
sharing tag 1 with regular strings. Safe strings are always heap-allocated
since inline strings don't have room for the flag.

API:
- VSafeString::new() - create a safe string
- VString::is_safe() - check if safe flag is set
- VString::into_safe() - convert to safe string (promotes inline to heap)
- Value::is_safe_string() / as_safe_string() - type checking and access

Closes #1026

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