v1.24 — More exercise guides

Exercise guides

• New guides for 6 strength exercises: Dumbbell Chest Press, Close Grip Chest Press, Bent Over Back Fly, Leg Press, Overhead Tricep Extension, Knee Raises
• Fixed silently-broken guide lookups for Incline Chest Press, MTS High Row, and Crunch — they had matching photos all along, but the lookup key didn't match the routine name

Coverage: 18 / 21 strength exercises now show a guide. Still missing: Shoulder Press, Bicep Curl, Oblique Rotation — these need photos of the specific machines (Life Fitness shoulder press, banded curl, Life Fitness rotary torso).