fix: resolve 'unknown' model in cycle spend anomaly alerts

getCycleSpendWithModels used the global MAX(date) to find models,
so users inactive on the latest day got NULL. Now uses each user's
own most recent active date instead.

Made-with: Cursor

Author: ofershap

src/lib/data/sqlite.ts

@@ -3021,8 +3021,11 @@ export function getCycleSpendWithModels(): Array<{
               COALESCE(du.most_used_model, '') as most_used_model
        FROM spending s
        LEFT JOIN (
-         SELECT email, most_used_model FROM daily_usage
-         WHERE date = (SELECT MAX(date) FROM daily_usage WHERE is_active = 1) AND is_active = 1
+         SELECT d.email, d.most_used_model FROM daily_usage d
+         INNER JOIN (
+           SELECT email, MAX(date) as max_date FROM daily_usage WHERE is_active = 1 GROUP BY email
+         ) latest ON d.email = latest.email AND d.date = latest.max_date
+         WHERE d.is_active = 1
        ) du ON s.email = du.email
        WHERE s.cycle_start = (SELECT MAX(cycle_start) FROM spending)
          AND s.spend_cents > 0`,