[codex] Refactor oversized source files

[colonelpanic8]

Summary

• Split oversized Rust, TypeScript, and BakkesMod source hubs into smaller focused modules.
• Move large in-module Rust tests into adjacent dedicated test files, including the BakkesMod crate tests.
• Remove or collapse extracted modules that were too small after the 1000-line threshold review.
• Rebase on the latest master and restore the TouchEvent::dodge_contact field path used by touch classification.

Behavioral impact

Intended to be refactor-only. The final commit fixes a split-induced rebase regression by restoring dodge_contact wiring so existing touch classification behavior is preserved.

Validation

• cargo fmt --check
• cargo check
• cargo test