feat(webhook-log): Add ascending/descending date sort controls to alert history

[NUMBER72857]

Summary

Adds a reusable useSortedLog hook and SortToggle button so users can switch between newest-first and oldest-first ordering in the webhook log / alert history.

Changes

• hooks/useSortedLog.ts: generic sort hook; toggleSort(), setSortDirection(), memoised sorted array; immutable (never mutates source)
• components/SortToggle.tsx: accessible button with ↑/↓ arrow and label; plugs into any table header
• __tests__/useSortedLog.test.ts: 8 tests — default sort, direction init, toggle, immutability, empty list, malformed timestamps

Integration into WebhookLog.tsx

import { useSortedLog } from '@/hooks/useSortedLog';
import { SortToggle } from '@/components/SortToggle';

const { sortedEntries, sortDirection, toggleSort } = useSortedLog(entries);

// In the table header:
<th><SortToggle direction={sortDirection} onToggle={toggleSort} /></th>

// In the table body, iterate sortedEntries instead of entries

Closes #103

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