🛠️ Fixer: FFB Safety and Feature Decoupling (v0.7.48)

[google-labs-jules]

This PR addresses multiple reliability and physics logic issues identified in the v0.7.48 development cycle.

🐛 Issues:

• Scrub Drag was unintentionally disabled when Road Texture was off.
• FFB forces could "stick" on the wheel if the game crashed or disconnected.
• Road Texture was capped at 2.0x, which was reported as too weak by some users.
• Slide Rumble was too sensitive, causing vibrations on straights.

🔧 Fixes:

• Scrub Drag: Moved logic outside the m_road_texture_enabled early exit in FFBEngine.h.
• FFB Safety: Moved DirectInputFFB::UpdateForce outside the connection check in main.cpp and ensured the force variable is reset to 0.0 every iteration.
• Tuning: Increased texture_safe_max clamp to 10.0 and effective_slip_vel threshold to 1.5 m/s in FFBEngine.h.

🛡️ Safety:

• The change in main.cpp ensures that the wheel is always zeroed out if the game is not driving or disconnected, preventing high-force "hangs" that could be dangerous.

🐧 Linux Note:

• All 220 tests passed in the Linux headless environment, including a new regression test for Scrub Drag independence.

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PR created automatically by Jules for task 4246810051260517654 started by @coasting-nc

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