Fix scheduled_at timezone display in macOS app

[hetaoBackend]

Summary

• add a small renderer datetime helper to keep naive and offset-aware timestamps aligned with the local system timezone
• fix scheduled_at display and edit-modal round-tripping so datetime-local values are no longer shifted through UTC
• add a regression test covering local parsing, datetime-local formatting, and submit serialization

Test Plan

• TZ=Asia/Shanghai node --test taskboard-electron/src/renderer/dateTime.test.mjs
• cd taskboard-electron && npx vite build --config vite.renderer.config.mjs

[vercel]

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Project	Deployment	Actions	Updated (UTC)
agentforge-landing	Ready	Preview, Comment	Mar 19, 2026 9:22am