chore(webapp): scope memo dependency diagnostics

[carderne]

Summary

Makes stable dashboard history refs explicit memo inputs and scopes the remaining compiler diagnostics to callbacks whose local handlers or lifetime-stable values cannot be represented accurately in dependency arrays.

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Latest commit: 3da30d8

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.