fix: apply capitalization hook to direct references

[amandeavor]

Summary

• make the capitalization hook configured on make-glossary available to direct gls/Gls calls, not only @ references
• preserve explicit per-call user-capitalize overrides
• document the shared behavior and add a multi-word regression case

The configured function is stored in document state and resolved at each reference location. Passing the function through an updater closure avoids Typst treating it as the state update callback itself.

Validation

• Tytanic 0.2.2: 43/43 tests passed
• advanced documentation compiled with Typst 0.13.1
• typstyle check passed for changed Typst sources

Addresses #197.

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[quachpas]

I'm sorry to say that I do not accept AI-assisted contributions. See my response in #200