feat(calendar): click due-date day to navigate to filtered Reporting view

- CalendarWidget accepts onDateClick prop; due-date cells are clickable
  with pointer cursor, red hover highlight, and updated tooltip
- App.js wires onDateClick: sets calendarFilter state and navigates to
  the Reporting page
- NavDrawer navigation to Reporting clears calendarFilter so it only
  applies on calendar-initiated navigation
- ReportingPage accepts filterDate prop; initializes columnFilters with
  { dueDate: Set([filterDate]) } so the view lands pre-filtered
- Existing Clear Filters button lets the user dismiss the filter normally

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/App.js

@@ -178,6 +178,7 @@ export default function App() {
   const [quickCheckResult, setQuickCheckResult] = useState(null);
   const [currentPage, setCurrentPage] = useState('home');
   const [navOpen, setNavOpen] = useState(false);
+  const [calendarFilter, setCalendarFilter] = useState(null);
   const [showAddCVE, setShowAddCVE] = useState(false);
   const [showUserManagement, setShowUserManagement] = useState(false);
   const [showAuditLog, setShowAuditLog] = useState(false);
@@ -961,7 +962,11 @@ export default function App() {
         isOpen={navOpen}
         onClose={() => setNavOpen(false)}
         currentPage={currentPage}
-        onNavigate={setCurrentPage}
+        onNavigate={(page) => {
+          // Clear calendar filter when navigating directly via the nav drawer
+          if (page === 'reporting') setCalendarFilter(null);
+          setCurrentPage(page);
+        }}
       />
       {/* Scanning line effect */}
       <div className="scan-line"></div>
@@ -1036,7 +1041,7 @@ export default function App() {
         </div>
 
         {/* Page content */}
-        {currentPage === 'reporting'      && <ReportingPage />}
+        {currentPage === 'reporting'      && <ReportingPage filterDate={calendarFilter} />}
         {currentPage === 'knowledge-base' && <KnowledgeBasePage />}
         {currentPage === 'exports'        && <ExportsPage />}
 
@@ -2220,7 +2225,12 @@ export default function App() {
                 Calendar
               </h2>
 
-              <CalendarWidget />
+              <CalendarWidget
+                onDateClick={(dateStr) => {
+                  setCalendarFilter(dateStr);
+                  setCurrentPage('reporting');
+                }}
+              />
             </div>
 
             {/* Open Vendor Tickets */}

frontend/src/components/CalendarWidget.js

@@ -16,7 +16,7 @@ function toLocalDateStr(date) {
     return `${y}-${m}-${d}`;
 }
 
-export default function CalendarWidget() {
+export default function CalendarWidget({ onDateClick }) {
     const today    = new Date();
     const todayStr = toLocalDateStr(today);
 
@@ -116,15 +116,19 @@ export default function CalendarWidget() {
                     return (
                         <div
                             key={idx}
-                            title={hasDue ? `${dueCount} finding${dueCount > 1 ? 's' : ''} due` : undefined}
+                            title={hasDue ? `${dueCount} finding${dueCount > 1 ? 's' : ''} due — click to view` : undefined}
+                            onClick={hasDue && onDateClick ? () => onDateClick(dateStr) : undefined}
                             style={{
                                 display: 'flex', flexDirection: 'column', alignItems: 'center',
                                 gap: '2px', padding: '3px 1px',
                                 borderRadius: '4px',
                                 background: isToday ? 'rgba(14,165,233,0.2)' : 'transparent',
                                 border: isToday ? '1px solid rgba(14,165,233,0.5)' : '1px solid transparent',
-                                cursor: hasDue ? 'default' : 'default',
+                                cursor: hasDue ? 'pointer' : 'default',
+                                transition: hasDue ? 'background 0.15s' : undefined,
                             }}
+                            onMouseEnter={hasDue ? (e) => { e.currentTarget.style.background = isToday ? 'rgba(14,165,233,0.35)' : 'rgba(239,68,68,0.15)'; } : undefined}
+                            onMouseLeave={hasDue ? (e) => { e.currentTarget.style.background = isToday ? 'rgba(14,165,233,0.2)' : 'transparent'; } : undefined}
                         >
                             <span style={{
                                 fontSize: '0.7rem', fontFamily: 'monospace', lineHeight: 1,

frontend/src/components/pages/ReportingPage.js

@@ -564,7 +564,7 @@ function TableCell({ colKey, finding }) {
 // ---------------------------------------------------------------------------
 // Main ReportingPage
 // ---------------------------------------------------------------------------
-export default function ReportingPage() {
+export default function ReportingPage({ filterDate }) {
     const [findings, setFindings]         = useState([]);
     const [total, setTotal]               = useState(null);
     const [syncedAt, setSyncedAt]         = useState(null);
@@ -574,7 +574,9 @@ export default function ReportingPage() {
     const [syncing, setSyncing]           = useState(false);
     const [sort, setSort]                 = useState({ field: 'severity', dir: 'desc' });
     const [columnOrder, setColumnOrder]   = useState(loadColumnOrder);
-    const [columnFilters, setColumnFilters] = useState({});
+    const [columnFilters, setColumnFilters] = useState(() =>
+        filterDate ? { dueDate: new Set([filterDate]) } : {}
+    );
     const [openFilter, setOpenFilter]     = useState(null);
     const filterBtnRefs                   = useRef({});