Add physics-based aiming previews and adjustable look ahead - #47
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Aiming now shows power through simulated cue-ball and object-ball trajectories instead of a Power % label. The preview uses the live table's physics snapshot, preserving rolling spin, rack collisions, cushions, and Black Hole Gravity; stop circles appear only at completed simulated resting positions. The immediate cue-tip-to-first-impact line remains visible while predictions update.
Adds a saved Look ahead slider (0–5 bounces or All). Shorter settings stop simulation at the selected horizon and omit false stopping markers. A warmed worker cancels obsolete calculations in small batches and receives the table snapshot once per gesture. Numbered planet caps no longer appear while aiming.
Validation: 319 unit tests pass, production build passes, and desktop/mobile browser checks completed. A browser preview-and-release comparison matched the cue-ball and first object-ball endpoints exactly. Regression coverage includes soft shots, full-rack cuts, follow/draw, cushion rebounds, gravity, stale worker responses, cancellation, and bounded look-ahead matching the full trajectory.