fix: correct SessionStats type mismatch for date fields

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Greptile Overview

Greptile Summary

This PR fixes a TypeScript type mismatch where SessionStats component expected string | null for date fields, but aggregateSessionStats returns Date | null from the database.

Changes made:

• Updated firstRequestAt and lastRequestAt types from string | null to Date | string | null in both the SessionStatsProps interface and TimeRow function parameter
• Removed unused Tooltip component imports that were no longer referenced
• Reorganized imports to comply with biome linting rules (lucide-react imports before next-intl)

Why this is safe:

• The TimeRow function already uses new Date(date) which handles both Date objects and strings correctly
• The type change is backwards compatible (more permissive, not restrictive)
• No runtime behavior changes - the component works identically before and after
• Verified data flow: Database SQL query returns Date → aggregateSessionStats returns Date | null → getSessionDetails passes it through → Component now correctly accepts it

Confidence Score: 5/5

• This PR is safe to merge with no risk - it's a straightforward type fix with no logic changes
• Score reflects that this is a pure type correction that aligns the component interface with actual database return types. The runtime code already handles both Date and string inputs correctly via new Date() constructor. The changes are minimal, well-documented, and include cleanup of unused imports. All tests pass (typecheck and lint verified).
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
src/app/[locale]/dashboard/sessions/[sessionId]/messages/_components/session-stats.tsx	5/5	Type fix for date fields to match database return type, unused imports removed, imports reorganized per linting rules

Sequence Diagram

sequenceDiagram
    participant UI as SessionStats Component
    participant Client as SessionMessagesClient
    participant Action as getSessionDetails
    participant Repo as aggregateSessionStats
    participant DB as Database

    Client->>Action: getSessionDetails(sessionId)
    Action->>Repo: aggregateSessionStats(sessionId)
    Repo->>DB: SQL query with min/max createdAt
    DB-->>Repo: firstRequestAt: Date, lastRequestAt: Date
    Repo-->>Action: stats with Date | null fields
    Action-->>Client: sessionStats with Date | null
    Client->>UI: <SessionStats stats={sessionStats} />
    UI->>UI: TimeRow receives Date | string | null
    UI->>UI: new Date(date) handles both types

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