Make project camera follow overridable during bootstrap

[joeykchen]

Summary

This changes the project-level camera.on behavior from a final bootstrap override to an initial default.

Before this change, runSpriteCallbacks applied the project camera target after all sprite Main functions had run, which meant a manual Camera.follow(...) inside MainEntry or sprite Main could be overwritten during bootstrap finalization.

With this change:

• project camera.on is applied first as the default follow target
• MainEntry, sprite Main, and OnLoaded can still override it later
• a regression test is added to verify that a manual camera follow set during bootstrap remains the final result

Why

This makes bootstrap behavior match user expectation: hand-written camera follow logic should win if it runs later than the project default.

Testing

• go test ./... -run TestRunSpriteCallbacksKeepsManualCameraFollowLast -count=1

[xgopilot]

I found one reviewable gap: the implementation changes the bootstrap ordering as intended, but the added regression test only covers a sprite Main() override, not the other override points this PR now claims to preserve.

[xgopilot]

No issues found after reviewing the bootstrap camera-follow ordering change and the added regression test. Verified that the new ordering is consistent with the existing bootstrap queue semantics, and go test ./... -run TestRunSpriteCallbacksKeepsManualCameraFollowLast -count=1 passed on commit 7b8817a1a673bbfb78ef2a4b9825d85b956b5283.

[xgopilot]

I did not find a functional regression in the reordered bootstrap camera logic. One test-coverage gap is worth tightening before this behavior claim spreads further.

[gemini-code-assist]

Code Review

This pull request moves the default camera target initialization in runSpriteCallbacks to occur before sprite initializers are executed. This change ensures that bootstrap hooks, such as a sprite's Main method, can successfully override the project's default camera target. A new test case, TestRunSpriteCallbacksKeepsManualCameraFollowLast, has been added to verify this behavior. I have no feedback to provide.