fix: UI drag simulation now keeps mouse position in sync during drags

[hatayama]

Summary

• UI mouse simulation (click, long-press, and drags) now keeps Mouse.current aligned with the simulated pointer position throughout the interaction.

User Impact

• Previously, UI handlers that read Mouse.current directly (instead of only through PointerEventData) could observe a stale mouse position during simulated clicks and drags.
• After this fix, both paths stay consistent, so gameplay code depending on Mouse.current behaves correctly during simulated UI interactions.

Changes

• Ports main branch commit fbe9cd4 (fix: UI drags now keep game mouse coordinates in sync #1471) to v3-beta's split executor architecture (MouseUiPressActionExecutor, MouseUiDragEventExecutor).
• Adds MouseUiInputSystemSync.SyncMousePosition, reusing the existing InputSystemUpdateHelper/InputUpdateTypeResolver helpers from Common/InputSystem.
• Wires the sync call into the five coordinate-update sites: click, long-press, drag begin, and both branches of drag interpolation.

Verification

• dist/darwin-arm64/uloop compile: success
• dist/darwin-arm64/uloop run-tests --test-mode PlayMode: 92/92 passed (including 2 new regression tests)
• dist/darwin-arm64/uloop run-tests --test-mode EditMode: 1726 passed, 0 failed, 7 skipped (pre-existing, unrelated)

Refs: main commit fbe9cd4 (#1471), Stream B of the main→v3-beta port plan

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 1072715e-8dcd-48d6-a000-62402a304c04

📥 Commits

Reviewing files that changed from the base of the PR and between ce5c364 and 7500f0a.

⛔ Files ignored due to path filters (3)

• Assets/Tests/PlayMode/SimulateMouseUiInputSystemTests.cs.meta is excluded by none and included by none
• Packages/src/Editor/FirstPartyTools/SimulateMouseUi/MouseUiInputSystemSync.cs.meta is excluded by none and included by none
• Packages/src/Editor/FirstPartyTools/SimulateMouseUi/UnityCLILoop.FirstPartyTools.SimulateMouseUi.Editor.asmdef is excluded by none and included by none

📒 Files selected for processing (5)

• Assets/Tests/PlayMode/SimulateMouseUiInputSystemTests.cs
• Packages/src/Editor/FirstPartyTools/Common/InputSystem/AssemblyInfo.cs
• Packages/src/Editor/FirstPartyTools/SimulateMouseUi/MouseUiDragEventExecutor.cs
• Packages/src/Editor/FirstPartyTools/SimulateMouseUi/MouseUiInputSystemSync.cs
• Packages/src/Editor/FirstPartyTools/SimulateMouseUi/MouseUiPressActionExecutor.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/port-stream-b-mouse-ui-position-sync

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