fix: resolve lint errors and xlarge mismatch for dev→uat promotion

- Remove unused gte/lt/ne imports from cascade.ts
- Prefix unused params originalEndTime, originalStartTime, newStartTime
  with underscore in cascade.ts and appointments.ts callers
- Remove unused petCoatType query param from book.ts availability route
- Align xlarge value: Book.tsx now uses "xlarge" (no hyphen) everywhere
  to match the Zod booking schema

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/src/pages/Book.tsx

@@ -515,7 +515,7 @@ export function BookPage() {
                     <option value="small">Small (under 15 lbs)</option>
                     <option value="medium">Medium (15–40 lbs)</option>
                     <option value="large">Large (40–80 lbs)</option>
-                    <option value="x-large">X-Large (over 80 lbs)</option>
+                    <option value="xlarge">X-Large (over 80 lbs)</option>
                   </select>
                 </div>
                 <div>
@@ -568,7 +568,7 @@ export function BookPage() {
               <div>
                 <div style={{ color: "#9ca3af", fontSize: 12, fontWeight: 600, textTransform: "uppercase" }}>Service</div>
                 <div style={{ fontWeight: 600 }}>{selectedService.name}</div>
-                <div style={{ color: "#6b7280" }}>{fmtPrice(selectedService.basePriceCents)} · {fmtDuration(selectedService.durationMinutes + ((form.petSizeCategory === "large" || form.petSizeCategory === "x-large") ? (selectedService.defaultBufferMinutes ?? 0) : 0))}</div>
+                <div style={{ color: "#6b7280" }}>{fmtPrice(selectedService.basePriceCents)} · {fmtDuration(selectedService.durationMinutes + ((form.petSizeCategory === "large" || form.petSizeCategory === "xlarge") ? (selectedService.defaultBufferMinutes ?? 0) : 0))}</div>
               </div>
               <div>
                 <div style={{ color: "#9ca3af", fontSize: 12, fontWeight: 600, textTransform: "uppercase" }}>Date & Time</div>