Regenerate case conversion TS bindings

[rekhoff]

Description of Changes

Updates the TypeScript code generator to emit correct .name() values on table fields, and updates the three affected Case Conversion Test snapshots.

Problem: For source identifiers with mixed/PascalCase casing (e.g., Player1Id), the in-process codegen path used by cargo test and check-diff.sh emitted .name() calls using the pre-conversion identifier (name('Player1Id')) instead of the canonical database column name (name('player_1_id')). The CLI spacetime generate path was already correct because its extract-schema round-trip canonicalizes names before codegen. The two paths disagreed, causing check-diff CI failures.

Root cause / Fix: write_object_type_builder_fields in crates/codegen/src/typescript.rs was using the TypespaceForGenerate pre-conversion identifier for .name(). It now accepts an optional &[ColumnDef] and emits column.name for table fields. The camelCase accessor key (e.g., player1Id) is unchanged; only the underlying wire/database column name is corrected to snake_case.

The three snapshot files in crates/bindings-typescript/case-conversion-test-client/src/module_bindings/ are updated to match the corrected output.

API and ABI breaking changes

No API or ABI changes at the Rust crate or C ABI level.
For TypeScript users, this is a bug fix for the in-process generation path; the CLI path was already correct.

Expected complexity level and risk

1 - Trivial

Testing

• Local testing
  • Verified the in-process cargo test -p spacetimedb-sdk -- case_conversion path on master generated incorrect PascalCase .name() values (name("Player1Id"), missing .name() for currentLevel2/status3Field.
  • Verified the same in-process path on the PR branch generates correct snake_case .name() values (name("player_1_id"), name("current_level_2"), name("status_3_field")), matching the updated snapshots.
  • Verified the CLI spacetime generate --lang typescript path produces identical snake_case output on both master and the PR branch.
  • Created a standalone TypeScript test that confirms the generated bindings produce SQL with canonical snake_case column names ("current_level_2", "player_1_id", "player_ref") via the SDK toSql() function.
• CI passing