fix: keep terminal handlers synced after reset

[hossainemruz]

Summary

• resolve selection data from the current WASM terminal after reset() replaces the buffer
• clear selection state before freeing the old terminal and make mouse-mode checks use the replacement terminal
• add regressions for selection below the original 24-row boundary and mouse tracking after reset
• regenerate committed ESM, CJS, and declaration artifacts

Testing

• bun test lib/terminal.test.ts — 149 passed
• bun run typecheck
• bun test — 373 passed
• bunx biome check lib/selection-manager.ts lib/terminal.test.ts
• bun run build:lib && bun run build:wasm-copy

Before: Only first few rows are selectable.

After: All rows are selectable.

Existing baseline issues

Repository-wide bun run fmt and bun run lint still report pre-existing findings in unrelated viewport/iris reproduction files and lib/terminal.ts:1881-1889; this PR introduces no new findings in its edited regions.

Disclosure

The changes of this PR is entirely generated by AI. I only validated the behavior manually.