Preview pane-local zoom and drag proxy

[jeonghun-jj-lee]

Summary

• render a neutral, non-intercepting Preview tab drag proxy with cancellation fade
• move zoom ownership into Preview leaves and route each renderer to its current pane
• inherit source zoom on split and adopt destination zoom on transfer
• apply the focused-pane edge through --accent-edge

Verification

• bunx playwright test e2e/regression/preview-baseline-contract.spec.ts
• bun run test:unit
• bun --filter @opencode-ai/session-ui test
• bun run typecheck
• bun run build

Closes harmoniqs/amicode#945
Refs harmoniqs/amicode#944

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[jeonghun-jj-lee]

Superseded at the requester’s direction: this work now lives on parent Preview workspace PR #319.