[zuru122]

Closes #863
Closes #864
Closes #865
Closes #866

Included:

• Save-Data detection and manual data-saver toggle.
• Reduced analytics payloads, polling, and deferred charts.
• Shared timezone-aware date-range picker with presets and validation.
• Forced-colors/high-contrast accessibility support.
• Nightly investor position reconciliation with safe corrections, alerts, and audit logs.
• Prisma migration and focused tests.
• Documentation for measuring transferred bytes.

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@zuru122 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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