LazyColumn Performance Optimization - key, contentType & Recomposition Control

LazyColumn performance hinges on:

• key — Prevents index-shift recompositions (critical)
• contentType — Enables ViewHolder-like recycling
• @stable/@Immutable — Compiler optimization hints
• remember lambdas — Prevent callback churn
• derivedStateOf — Isolate scroll/selection state
• Extract composables — Enable skipping

For lists >500 items, use all techniques. For <50 items, keys + contentType suffice.

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