feat(input): implement pc mouse aim and hold-fire auto-swing

[f1cklepickle]

Why

PC combat needed mouse-facing + left-click attack support, and hold-fire behavior needed to be reliable without breaking mobile touch controls.
Recent changes also required structure cleanup to prevent PlayerController from regressing.

What changed

• Added PC look binding for mouse position and wired cursor-facing attack flow
• Implemented hold-left auto-swing behavior through existing cooldown-gated attack authority
• Fixed mouse pointer bleed into mobile touch zones during normal editor PC testing
• Extracted fire and aim responsibilities into dedicated components:
  • PlayerFireInputController
  • PlayerAimInputResolver
• Wired extracted components explicitly on Player.prefab
• Added EditMode + PlayMode regression coverage and updated Docs/TEST_LOG.md

How to test

1. Open MainPrototype
2. Press Play and verify:
   • PC: mouse look + left-click attack works
   • Hold left-click: repeated attacks
   • Release left-click: attacks stop immediately
3. Verify editor touch controls do not hijack mouse movement in normal PC play
4. Verify Android simulator/touch behavior still supports right-stick/aim-zone direction
5. Run tests:
   • EditMode
   • PlayMode (includes hold-fire cadence regression)

Checklist

• Unit tests (EditMode) added or updated
• PlayMode test or manual validation included
• Demo scene updated (if player-visible) N/A
• Prefab links, tags, and layers validated
• README / Docs touched

Related

• Closes feat(input): pc mouse aim — cursor facing and left-click attack #140