Fix various issues and add missing VGUI panels

[Pollux12]

Closes #16

Greptile Summary

The PR improves generated LuaLS annotations and adds missing metadata for several VGUI and Garry's Mod classes.

• Converts sequential table and union member types into more useful LuaLS forms.
• Emits typed inline defaults for struct fields and corrects fake-enum/source annotations.
• Adds CreationMenu, divider, divider-bar, and related custom class metadata.
• Expands tests for sequential tables, unions, and default annotations.

Confidence Score: 5/5

The PR appears safe to merge with no concrete blocking or independently actionable non-blocking issues identified.

The changed writer behavior is covered for its intended table, union, enum, and default-annotation cases, while the observed complicated nested-union limitation is already explicitly documented as unsupported.

Important Files Changed

Filename	Overview
src/api-writer/glua-api-writer.ts	Adds recursive union and sequential-table transformations, typed default normalization, and corrected fake-enum annotations; no unacknowledged actionable defect was established.
tests/api-writer/write-type.spec.ts	Adds focused coverage for sequential-table conversion, structure paths, nested struct syntax, and unions.
tests/api-writer/glua-api-writer.spec.ts	Updates expected annotations for raw symbolic defaults and corrected fake-enum alias syntax.
custom/class.CreationMenu.lua	Adds CreationMenu and CreationMenuTab metadata, including tab lookup and population methods.
custom/HTTPRequest.lua	Re-expresses documented HTTP request defaults as typed inline annotation defaults.
custom/class.PlayerClass.lua	Re-expresses player-class defaults as inline typed defaults while retaining runtime-injected optional fields.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[Wiki type and struct metadata] --> B[GluaApiWriter]
  B --> C[Transform union members]
  C --> D[Convert sequential tables]
  B --> E[Normalize field defaults]
  D --> F[Generated LuaLS annotations]
  E --> F
  G[Custom VGUI metadata] --> F

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_{Reviews (1): Last reviewed commit: "Fix custom overrides to use proper annot..." | Re-trigger Greptile}