Fix inbox sender search filtering

[gentlemandev]

Adds structured exact sender filtering for inbox search so Gmail and Outlook can search by sender address without relying on broad text syntax.

• Adds searchInbox.fromEmail and forwards it through email providers.
• Applies exact Outlook sender filtering through OData and paginated fallback paths.
• Updates provider guidance and targeted tests for sender search behavior.
• Tests: pnpm test utils/ai/assistant/chat-inbox-tools.test.ts utils/email/microsoft.test.ts

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
inbox-zero	Ignored	Preview	May 15, 2026 6:43pm

[cubic-dev-ai]

No issues found across 9 files

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