fix: route terminal mouse events to applications

[opencode-agent]

Summary

• route wheel input to application mouse reporting instead of replacing it with arrow keys when mouse tracking is enabled
• correctly encode button-free movement, Alt modifiers, horizontal scrolling, and small trackpad deltas
• defer text selection to applications while mouse tracking is active, with Shift preserved as the selection override
• regenerate the committed browser bundles so consumers of the Git dependency receive the fix

Verification

• bun test — 378 passing tests, including seven new mouse-reporting regression cases
• bun run typecheck
• bun run build:lib && bun run build:wasm-copy
• scoped Biome checks pass for the changed input, selection, and regression-test files; repository-wide formatting/lint checks currently report pre-existing violations on main

Requested by: @Brendonovich (Brendan via Slack)