Remove AI code slop

Check the diff against main and remove AI-generated slop introduced in the branch.

Focus Areas

Unnecessary comments - Extra comments that are unnecessary or inconsistent with local style
Defensive overkill - Defensive checks or try/catch blocks that are abnormal for trusted code paths
Type escape hatches - Casts to any used only to bypass type issues
Deep nesting - Deeply nested code that should be simplified with early returns
Single-use variables - Variables used once immediately after declaration; inline the RHS instead
Single-use type definitions - Separate type or interface definitions used in only one place (React props, function parameters, return types, etc.); inline the type directly where it's used
Re-exports from another file - There should be exactly one export of a thing, in the file that defines it. Don't re-export something defined elsewhere — whether the file is a pure barrel/pass-through or does real work alongside the re-exports. Drop the re-export lines and point importers at the defining module.
Style drift - Other patterns inconsistent with the file and surrounding codebase