refactor: simplify mode transitions with lookup table

[alamenai]

What

• Extract Mode type alias from inline union type.
• Add transitions record mapping each mode → { next, delay }.
• Simplify useEffect from 17 lines to 4 lines.

Why

Before:

Each mode transition required a separate if-else branch, duplicating the setTimeout pattern 6 times.

Adding or modifying a mode meant editing imperative logic.

After:

Transitions are defined declaratively in one place.

The useEffect simply looks up the next state and delay—no branching required.

This follows the "data over code" principle and makes the state machine self-documenting.

Test

• Verify matrix animation cycles through all modes correctly.
• Confirm timing matches previous behavior.

[vercel]

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