fix(08-02): coerce Postgres numeric hours_worked to Number before toFixed

Postgres returns NUMERIC columns as strings via pg, so calling
.toFixed(1) on time_entries.hours_worked from /api/engagement/user/[userId]
threw at runtime. The period-level hours in the same response are already
parseFloat'd; the recentEntries and matchedEntries arrays pass rows through
verbatim, so wrap with Number() at render.

components/mobile/EngagementRecentEntries.tsx

@@ -71,7 +71,7 @@ export function EngagementRecentEntries({ entries }: EngagementRecentEntriesProp
                         <span className="flex-1 min-w-0 flex items-baseline gap-2">
                           <span className="text-sm font-medium tabular-nums shrink-0">{dateLabel}</span>
                           <span className="text-sm text-muted-foreground tabular-nums shrink-0">
-                            {entry.hours_worked.toFixed(1)}h
+                            {Number(entry.hours_worked).toFixed(1)}h
                           </span>
                           {isBillable && (
                             <Badge variant="secondary" className="shrink-0">Billable</Badge>

components/mobile/EngagementRecentMeetings.tsx

@@ -109,7 +109,7 @@ export function EngagementRecentMeetings({ meetings }: EngagementRecentMeetingsP
                           <ul className="space-y-1">
                             {meeting.matchedEntries.map((te, j) => (
                               <li key={j} className="flex flex-wrap gap-x-2">
-                                <span className="text-foreground tabular-nums">{te.hours_worked.toFixed(1)}h</span>
+                                <span className="text-foreground tabular-nums">{Number(te.hours_worked).toFixed(1)}h</span>
                                 {te.company_name && <span>· {te.company_name}</span>}
                                 {te.notes && <span className="truncate">· {te.notes.split('\n')[0]?.slice(0, 80) ?? ''}</span>}
                               </li>