[WIP] add variable FPS & VSync

[mercury233]

• Change the previously fixed frame rate of 60 to a configurable value, and adjust the number of animation frames based on the frame rate multiplier.
• Add the vertical sync option; in this mode, the system automatically sets the frame rate to match the display’s refresh rate.
• Add a frame rate configuration: when vertical sync is disabled, it sets the target frame rate; when vertical sync is enabled, it is used as a fallback for manual configuration if the display’s refresh rate cannot be obtained.

Known issues:

• On Linux, enabling vertical sync may cause errors on some GPUs, while on others it has no effect.
• Retrieving the display refresh rate is not implemented on Linux.
• On macOS, enabling vertical sync may result in double the frame rate.
• Some animations still require fine-tuning.

[Copilot]

Pull request overview

Adds configurable FPS and VSync support to the gframe rendering/game loop, and updates multiple UI/animation paths to keep animation timing consistent when running above 60 FPS.

Changes:

• Introduces vsync and target_fps config options, derives an effectiveFps, and scales timing/animation steps using fpsScale plus a 60Hz-ish logicalTick.
• Updates card movement/fade and several UI animations to be frame-rate aware (new ScaleFrame(), SetCardMovement(), float alpha handling).
• Adjusts LP animation and various per-frame increments to remain time-consistent across frame rates.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
gframe/game.h	Adds new config fields and frame-scaling state used by the main loop and animations.
gframe/game.cpp	Applies VSync at device creation; computes effectiveFps/fpsScale; updates the main loop timing and adds ScaleFrame().
gframe/duelclient.cpp	Switches many ad-hoc movement setups to SetCardMovement() and updates LP animation setup for scaled frames.
gframe/drawing.cpp	Converts multiple animations to scale by FPS and uses logicalTick; updates fade/LP logic to be frame-rate aware.
gframe/client_field.h	Adds SetCardMovement() and renames parameters to frame60 to clarify semantics.
gframe/client_field.cpp	Implements SetCardMovement() and scales MoveCard()/FadeCard() durations via ScaleFrame().
gframe/client_card.h	Changes alpha fields to float and adds targetAlpha to stabilize fade completion.

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