feat(office): mail preview, infinite scroll, pane resize, and scrollbars

Polish the office TUI with proportional pane layout, drag resize, live
filtering, HTML mail preview, paginated mail lists, overflow scrollbars,
flattened navigation, and project save/status fixes; add UpdateProjectStatus.

Co-authored-by: Cursor <cursoragent@cursor.com>

cmd/office/model/columns.go

@@ -37,6 +37,12 @@ func BuildColumns(subject Subject, items []Item) []TableColumn {
 	if subject == SubjectProjects {
 		return buildProjectColumns(items)
 	}
+	if subject == SubjectTasks {
+		return buildTaskColumns(items)
+	}
+	if subject == SubjectCalendar {
+		return buildCalendarColumns(items)
+	}
 	cols := []TableColumn{
 		{Key: "_sel", Title: "✓", Width: 3},
 		{Key: "id", Title: "ID", Width: 10},
@@ -64,10 +70,43 @@ func BuildColumns(subject Subject, items []Item) []TableColumn {
 	return cols
 }
 
+func buildCalendarColumns(items []Item) []TableColumn {
+	cols := []TableColumn{
+		{Key: "_sel", Title: "✓", Width: 3},
+		{Key: "id", Title: "ID", Width: 10},
+		{Key: "type", Title: "Type", Width: 10},
+		{Key: "title", Title: "Title", Width: 28},
+	}
+	for _, key := range []string{"start", "end"} {
+		if columnHasData(items, key) {
+			cols = append(cols, TableColumn{Key: key, Title: titleLabel(key), Width: defaultWidth(key)})
+		}
+	}
+	sizeColumns(cols, items)
+	return cols
+}
+
+func buildTaskColumns(items []Item) []TableColumn {
+	cols := []TableColumn{
+		{Key: "_sel", Title: "✓", Width: 3},
+		{Key: "id", Title: "ID", Width: 8},
+		{Key: "title", Title: "Title", Width: 28},
+		{Key: "status", Title: "Status", Width: 10},
+	}
+	for _, key := range []string{"deadline", "responsible"} {
+		if columnHasData(items, key) {
+			cols = append(cols, TableColumn{Key: key, Title: titleLabel(key), Width: defaultWidth(key)})
+		}
+	}
+	sizeColumns(cols, items)
+	return cols
+}
+
 func buildProjectColumns(items []Item) []TableColumn {
 	cols := []TableColumn{
 		{Key: "_sel", Title: "✓", Width: 3},
 		{Key: "id", Title: "ID", Width: 8},
+		{Key: "status", Title: "Status", Width: 8},
 		{Key: "title", Title: "Title", Width: 28},
 		{Key: "tasks", Title: "Tasks (open/closed)", Width: 18},
 		{Key: "documents", Title: "Documents", Width: 11},
@@ -89,6 +128,47 @@ func CellText(it Item, key string) string {
 		return it.ID
 	case "title":
 		return it.Title
+	case "type":
+		return CalendarTypeLabel(it)
+	case "start", "end":
+		if it.Raw == nil {
+			return ""
+		}
+		if formatted := FormatCalendarDateTime(it.Raw[key]); formatted != "" {
+			return formatted
+		}
+		return formatAny(it.Raw[key])
+	case "status":
+		switch it.Kind {
+		case KindProject:
+			return ProjectStatusLabel(it.Raw)
+		case KindTask, KindCRMTask:
+			if it.Raw == nil {
+				return ""
+			}
+			return TaskStatusLabel(it.Raw["status"])
+		default:
+			if it.Raw == nil {
+				return ""
+			}
+			return formatAny(it.Raw["status"])
+		}
+	case "deadline":
+		if it.Raw == nil {
+			return ""
+		}
+		if rel := FormatRelativeDeadline(it.Raw["deadline"]); rel != "" {
+			return rel
+		}
+		return formatAny(it.Raw["deadline"])
+	case "responsible":
+		if it.Kind == KindTask || it.Kind == KindCRMTask {
+			return TaskResponsibleLabel(it.Raw)
+		}
+		if it.Raw == nil {
+			return ""
+		}
+		return formatAny(it.Raw["responsible"])
 	case "subtitle":
 		return it.Subtitle
 	case "tasks":
@@ -230,7 +310,7 @@ func defaultWidth(key string) int {
 	case "id", "status", "stage":
 		return 10
 	case "start", "end", "deadline", "date":
-		return 18
+		return 20
 	case "from", "to", "email", "primaryEmail":
 		return 22
 	case "description", "displayName":