[pending-judge] feat(DC-168): calendar widget UX + theming — "No upcoming appointments" state, month grid with highlighted appointment days, theme-correct styling

Owner requests (2026-10-10/11):
1. "Instead of showing no calendar like it does now It should just show no
   upcoming appointments but if there are appointments it should show a
   calendar with the days and times highlighted for each appointment"
2. "We should properly stylize the calendar to fit with each theme correctly"
3. "Should also be a relatively small widget basically about the size of the
   weather widget"

Changes (status/ only — frontend):
- Chip: empty state now says "No upcoming appointments" (the calendar IS
  connected — the old "No calendar" string was wrong); with events it shows
  title + day/time with .cal-chip-when accent highlight. Chip CSS keeps the
  existing weather-widget proportions (padding 4px 10px, 0.85rem, pill).
- Modal: month GRID (cal-grid, 7 columns, prev/next month nav) with:
  appointment days highlighted (accent-tinted background + border), today
  ring, per-event dots with time tooltips; Upcoming list kept below with
  day/time emphasis. Sources manager unchanged functionally, restyled via
  CSS vars.
- Theming: every color via CSS variables (--fg/--muted/--accent/--border/
  --base/--hover/--error). Per-theme overrides for dark-accent themes where
  small accent text fails contrast on dark surfaces (taxi/ocean/
  solarized-dark get brightened chip-when/dots; black gets its red accent;
  solarized-light dark-on-light). User/custom themes derive automatically
  via color-mix(--accent, white). No hardcoded hex in the shared rules.

Bug fixed en route: escapeHtml was previously expected as a global (never
defined in this file — latent XSS/ReferenceError if another bundle didn't
provide it). Now defined locally.

Verification: node --check clean; DC-168 smoke harness (DOM shim) proves
empty chip → "No upcoming appointments", events chip → title + highlighted
when-span, modal grid renders correct day-cell counts with cal-day/cal-dow
structure; eslint 0 errors (parser-options run).

status/js/calendar-widget.js

@@ -1,17 +1,32 @@
-// ========== CALENDAR WIDGET (DC-161) ==========
+// ========== CALENDAR WIDGET (DC-161 + DC-168) ==========
 // Zero-config for calendars deployed through DashCaddy (Radicale auto-wiring);
 // manual CalDAV/ICS sources via the ⚙️ settings modal. Weather-widget pattern:
 // compact top-bar display + weather-modal shell + server-backed settings.
+//
+// DC-168 (owner requirements):
+//  1. Empty → chip says "No upcoming appointments" (calendar IS connected).
+//  2. With events → chip shows the next appointment (title + day/time).
+//  3. Modal → month GRID with appointment days highlighted (+ times in
+//     tooltip and the Upcoming list), not just a flat list.
+//  4. Chip stays weather-widget size (CSS keeps padding/font identical).
+//  5. Everything styled with CSS variables + [data-theme] overrides in
+//     dashboard.css — correct across all themes and user themes.
 (function() {
   const errorHandler = new ErrorHandler();
 
   injectModal('calendar-modal', `<div id="calendar-modal" class="weather-modal">
     <div class="weather-modal-content" style="min-width:560px;max-width:720px;">
       <h3>📅 Calendar</h3>
-      <div id="calendar-upcoming" style="margin:0 0 14px;">
-        <div style="font-size:0.8rem;color:var(--muted);margin-bottom:6px;">Next 14 days</div>
-        <div id="calendar-upcoming-list" style="display:flex;flex-direction:column;gap:4px;max-height:180px;overflow-y:auto;">
-          <div style="color:var(--muted);font-size:0.85rem;">No upcoming appointments.</div>
+      <div class="cal-monthbar">
+        <button id="cal-prev" class="cal-nav-btn" aria-label="Previous month">‹</button>
+        <span id="cal-month-label" class="cal-month-label"></span>
+        <button id="cal-next" class="cal-nav-btn" aria-label="Next month">›</button>
+      </div>
+      <div id="cal-grid" class="cal-grid"></div>
+      <div id="calendar-upcoming" style="margin:12px 0 14px;">
+        <div style="font-size:0.8rem;color:var(--muted);margin-bottom:6px;">Upcoming appointments</div>
+        <div id="calendar-upcoming-list" class="cal-list">
+          <div class="cal-empty">No upcoming appointments.</div>
         </div>
       </div>
       <div style="margin-top:14px;padding-top:12px;border-top:1px solid var(--border);">
@@ -53,6 +68,12 @@
       <div class="weather-modal-buttons"><button id="calendar-close">Close</button></div>
     </div></div>`);
 
+  function escapeHtml(s) {
+    return String(s == null ? '' : s)
+      .replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
+      .replace(/"/g, '&quot;').replace(/'/g, '&#39;');
+  }
+
   const widgetEls = () => ({
     icon: document.querySelector('.calendar-widget-icon'),
     text: document.querySelector('.calendar-widget-text'),
@@ -69,9 +90,19 @@
     return `${dayLabel} ${timeLabel}`;
   }
 
+  function fmtTime(start, allDay) {
+    if (allDay) return 'all-day';
+    return new Date(start).toLocaleTimeString(undefined, { hour: 'numeric', minute: '2-digit' });
+  }
+
+  function dayKey(d) {
+    return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`;
+  }
+
   async function fetchCalendar() {
+    // 60-day window: chip needs the next event; grid needs the current month.
     const start = new Date(Date.now() - 86400000);
-    const end = new Date(Date.now() + 14 * 86400000);
+    const end = new Date(Date.now() + 60 * 86400000);
     const resp = await fetch(`/api/v1/calendar/events?start=${start.toISOString()}&end=${end.toISOString()}`, { cache: 'no-store' });
     if (resp.status === 404) return { notConfigured: true };
     if (!resp.ok) throw new Error(`Calendar API HTTP ${resp.status}`);
@@ -84,13 +115,52 @@
     const events = (body && Array.isArray(body.events)) ? body.events : [];
     if (!events.length) {
       els.icon.textContent = '📅';
-      els.text.textContent = 'No calendar';
+      els.text.innerHTML = '<span class="cal-chip-muted">No upcoming appointments</span>';
       return;
     }
     const next = events[0];
     els.icon.textContent = next.allDay ? '🗓️' : '⏰';
-    els.text.innerHTML = `${escapeHtml(next.title || 'Untitled')}
-      <span style="color:var(--muted);font-size:0.78em;">· ${escapeHtml(fmtWhen(next.start, next.allDay))}</span>`;
+    els.text.innerHTML = `<span class="cal-chip-title">${escapeHtml(next.title || 'Untitled')}</span>` +
+      `<span class="cal-chip-when">· ${escapeHtml(fmtWhen(next.start, next.allDay))}</span>`;
+  }
+
+  // ---- Month grid ----
+  let viewMonth = null; // first day of visible month
+  function eventMap(body) {
+    const map = {};
+    for (const ev of ((body && Array.isArray(body.events)) ? body.events : [])) {
+      const k = dayKey(new Date(ev.start));
+      (map[k] = map[k] || []).push(ev);
+    }
+    return map;
+  }
+
+  function renderGrid(body) {
+    const grid = document.getElementById('cal-grid');
+    const label = document.getElementById('cal-month-label');
+    if (!grid || !label) return;
+    if (!viewMonth) { viewMonth = new Date(); viewMonth.setDate(1); }
+    const y = viewMonth.getFullYear(), m = viewMonth.getMonth();
+    label.textContent = viewMonth.toLocaleDateString(undefined, { month: 'long', year: 'numeric' });
+    const byDay = eventMap(body);
+    const todayKey = dayKey(new Date());
+    const firstDow = new Date(y, m, 1).getDay();
+    const daysIn = new Date(y, m + 1, 0).getDate();
+    let html = ['S', 'M', 'T', 'W', 'T', 'F', 'S'].map(d => `<div class="cal-dow">${d}</div>`).join('');
+    for (let i = 0; i < firstDow; i++) html += '<div class="cal-day cal-pad"></div>';
+    for (let day = 1; day <= daysIn; day++) {
+      const key = `${y}-${String(m + 1).padStart(2, '0')}-${String(day).padStart(2, '0')}`;
+      const dayEvents = byDay[key] || [];
+      const cls = ['cal-day'];
+      if (key === todayKey) cls.push('cal-today');
+      if (dayEvents.length) cls.push('cal-has-events');
+      const dots = dayEvents.slice(0, 3).map((e) =>
+        `<span class="cal-dot" title="${escapeHtml(fmtTime(e.start, e.allDay))}"></span>`).join('');
+      const tip = dayEvents.map(e => `${fmtTime(e.start, e.allDay)} — ${e.title || 'Untitled'}`).join('\n');
+      html += `<div class="${cls.join(' ')}" title="${escapeHtml(tip || key)}">` +
+        `<span class="cal-daynum">${day}</span>${dots ? `<span class="cal-dots">${dots}</span>` : ''}</div>`;
+    }
+    grid.innerHTML = html;
   }
 
   function renderUpcoming(body) {
@@ -98,14 +168,14 @@
     if (!list) return;
     const events = (body && Array.isArray(body.events)) ? body.events : [];
     if (!events.length) {
-      list.innerHTML = '<div style="color:var(--muted);font-size:0.85rem;">No upcoming appointments.</div>';
+      list.innerHTML = '<div class="cal-empty">No upcoming appointments.</div>';
       return;
     }
     list.innerHTML = events.slice(0, 12).map(ev =>
-      `<div style="display:flex;gap:8px;align-items:baseline;">
-         <span style="font-size:0.78rem;color:var(--muted);white-space:nowrap;">${escapeHtml(fmtWhen(ev.start, ev.allDay))}</span>
-         <span style="font-size:0.85rem;">${escapeHtml(ev.title || 'Untitled')}</span>
-         ${ev.location ? `<span style="font-size:0.75rem;color:var(--muted);">${escapeHtml(ev.location)}</span>` : ''}
+      `<div class="cal-row">
+         <span class="cal-when">${escapeHtml(fmtWhen(ev.start, ev.allDay))}</span>
+         <span class="cal-evtitle">${escapeHtml(ev.title || 'Untitled')}</span>
+         ${ev.location ? `<span class="cal-loc">${escapeHtml(ev.location)}</span>` : ''}
        </div>`).join('');
   }
 
@@ -122,16 +192,15 @@
       }
     } catch (e) { /* modal still usable */ }
     if (!sources.length) {
-      listEl.innerHTML = '<div style="font-size:0.82rem;color:var(--muted);">No calendars connected. Deploy Radicale from the App Selector to auto-connect one, or add a CalDAV/ICS URL below.</div>';
+      listEl.innerHTML = '<div class="cal-empty">No calendars connected. Deploy Radicale from the App Selector to auto-connect one, or add a CalDAV/ICS URL below.</div>';
       return;
     }
     listEl.innerHTML = sources.map(s => `
-      <div style="display:flex;gap:8px;align-items:center;border:1px solid var(--border);border-radius:6px;padding:6px 10px;">
-        <span style="font-size:0.85rem;flex:1;">${escapeHtml(s.name || s.id)}
-          <span style="color:var(--muted);font-size:0.72rem;">· ${escapeHtml(s.type)}${s.autoProvisioned ? ' · auto-wired' : ''}</span></span>
-        <button class="cal-src-toggle" data-id="${escapeHtml(s.id)}" data-enabled="${s.enabled !== false ? '1' : '0'}"
-          style="font-size:0.75rem;padding:2px 8px;">${s.enabled !== false ? '✓ on' : 'off'}</button>
-        <button class="cal-src-del" data-id="${escapeHtml(s.id)}" style="font-size:0.75rem;padding:2px 8px;color:var(--err-fg);">remove</button>
+      <div class="cal-row cal-src-row">
+        <span class="cal-evtitle">${escapeHtml(s.name || s.id)}
+          <span class="cal-loc">· ${escapeHtml(s.type)}${s.autoProvisioned ? ' · auto-wired' : ''}</span></span>
+        <button class="cal-src-toggle cal-btn" data-id="${escapeHtml(s.id)}" data-enabled="${s.enabled !== false ? '1' : '0'}">${s.enabled !== false ? '✓ on' : 'off'}</button>
+        <button class="cal-src-del cal-btn cal-btn-danger" data-id="${escapeHtml(s.id)}">remove</button>
       </div>`).join('');
     listEl.querySelectorAll('.cal-src-toggle').forEach(btn => btn.addEventListener('click', async () => {
       const id = btn.dataset.id;
@@ -149,27 +218,32 @@
     }));
   }
 
+  let lastBody = null;
   async function refresh() {
     if (refresh._inFlight) return;
     refresh._inFlight = true;
     try {
       const body = await fetchCalendar();
+      lastBody = body;
       renderWidget(body);
       if (document.getElementById('calendar-modal').style.display === 'flex') {
+        renderGrid(body);
         renderUpcoming(body);
       }
     } catch (e) {
       errorHandler.log(e, 'calendar-widget');
       const els = widgetEls();
-      if (els.text) els.text.textContent = 'Calendar offline';
+      if (els.text) els.text.innerHTML = '<span class="cal-chip-muted">Calendar offline</span>';
     } finally {
       refresh._inFlight = false;
     }
   }
 
-  // ---- Settings modal wiring ----
+  // ---- Modal wiring ----
   function openModal() {
     document.getElementById('calendar-modal').style.display = 'flex';
+    renderGrid(lastBody || { events: [] });
+    renderUpcoming(lastBody || { events: [] });
     renderSources();
     refresh();
   }
@@ -237,6 +311,18 @@
   if (calSettings) calSettings.addEventListener('click', (e) => { e.stopPropagation(); openModal(); });
   const calClose = document.getElementById('calendar-close');
   if (calClose) calClose.addEventListener('click', closeModal);
+  const calPrev = document.getElementById('cal-prev');
+  if (calPrev) calPrev.addEventListener('click', () => {
+    if (!viewMonth) { viewMonth = new Date(); viewMonth.setDate(1); }
+    viewMonth = new Date(viewMonth.getFullYear(), viewMonth.getMonth() - 1, 1);
+    renderGrid(lastBody || { events: [] });
+  });
+  const calNext = document.getElementById('cal-next');
+  if (calNext) calNext.addEventListener('click', () => {
+    if (!viewMonth) { viewMonth = new Date(); viewMonth.setDate(1); }
+    viewMonth = new Date(viewMonth.getFullYear(), viewMonth.getMonth() + 1, 1);
+    renderGrid(lastBody || { events: [] });
+  });
 
   window.refreshCalendarWidget = refresh;