polish benchmarks page and landing animation

[cs01]

Summary

• Format all benchmark values to 3 decimal places for consistent display
• Remove text mentioning we only show top-3 benchmarks
• Rename 'fib' to 'app' in the landing page pipeline animation
• Slow down animation transitions so source→parse→analyze steps are less jarring

Test plan

• Verify benchmark values show 3 decimal places (e.g. 0.381s not 0.381451904296875s)
• Landing page animation paces well between steps
• Cube at end shows "app" not "fib"

[github-actions]

Benchmark Results (Linux x86-64)

Benchmark	C	ChadScript	Go	Node	Bun	Place
Binary Trees	1.412s	1.235s	2.715s	1.190s	1.014s	🥉
Cold Start	0.9ms	0.8ms	1.2ms	26.5ms	8.8ms	🥇
Fibonacci	0.814s	1.472s	1.559s	3.181s	1.978s	🥈
File I/O	0.120s	0.090s	0.090s	0.204s	0.190s	🥇
JSON Parse/Stringify	0.004s	0.005s	0.017s	0.015s	0.007s	🥈
Matrix Multiply	0.449s	0.718s	0.617s	0.370s	0.336s	#5
Monte Carlo Pi	0.389s	0.410s	0.405s	2.248s	6.026s	🥉
N-Body Simulation	1.665s	2.125s	2.203s	2.381s	3.241s	🥈
Quicksort	0.215s	0.244s	0.213s	0.261s	0.228s	#4
SQLite	0.345s	0.396s	—	0.421s	0.399s	🥈
Sieve of Eratosthenes	0.014s	0.026s	0.018s	0.038s	0.038s	🥉
String Manipulation	0.008s	0.045s	0.016s	0.035s	0.027s	#5

CLI Tool Benchmarks

Benchmark	ChadScript	grep	node	xxd	Place
Hex Dump	0.421s	—	0.922s	0.130s	🥈
Recursive Grep	0.019s	0.010s	0.096s	—	🥈