feat(bookings): customer self-service rebooking with real slot picker

CustomerBookingView now carries tenantSlug/serviceId/staffId/
classSessionId so the manage page can query live availability; class
bookings resolve their session title as the display label. Reschedule
rejects waitlisted/completed bookings and session-bound class bookings
(400), collapsing a dead branch in the appointment path.

The manage page reschedule dialog replaces free-form date/time inputs
with a date → availability-slot picker filtered to appointment mode,
so customers can only move to a genuinely free slot with the correct
duration; 409 surfaces "slot just taken". Actions are status-gated:
reschedule for confirmed/pending appointments, cancel for live
bookings, explanatory note for class bookings.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

packages/api-client/src/generated/types.ts

@@ -1120,6 +1120,32 @@ export interface components {
             notes?: string;
             phone?: string;
         };
+        CustomerBookingView: {
+            businessName?: string;
+            /**
+             * Format: uuid
+             * @description Present for session-bound bookings, which cannot be rescheduled to arbitrary times
+             */
+            classSessionId?: string;
+            customerEmail?: string;
+            customerName?: string;
+            /** Format: date-time */
+            endsAt?: string;
+            location?: string;
+            notes?: string;
+            reference?: string;
+            service?: string;
+            /** Format: uuid */
+            serviceId?: string;
+            /** Format: uuid */
+            staffId?: string;
+            /** Format: date-time */
+            startsAt?: string;
+            status?: string;
+            tenantSlug?: string;
+            /** @description 1-based queue spot for waitlisted class bookings; absent otherwise */
+            waitlistPosition?: number;
+        };
         DashboardBookingRequest: {
             /** Format: email */
             customerEmail: string;
@@ -3186,7 +3212,9 @@ export interface operations {
                 headers: {
                     [name: string]: unknown;
                 };
-                content?: never;
+                content: {
+                    "application/json": components["schemas"]["CustomerBookingView"];
+                };
             };
             /** @description Invalid manage token */
             403: {
@@ -3239,7 +3267,10 @@ export interface operations {
     };
     rescheduleBooking: {
         parameters: {
-            query?: never;
+            query: {
+                /** @description Manage token issued at booking time */
+                token: string;
+            };
             header?: never;
             path: {
                 reference: string;
@@ -3250,10 +3281,10 @@ export interface operations {
             content: {
                 "application/json": {
                     /** Format: date-time */
-                    endsAt?: string;
+                    newEndsAt: string;
                     /** Format: date-time */
-                    startsAt: string;
-                    token: string;
+                    newStartsAt: string;
+                    reason?: string;
                 };
             };
         };
@@ -3265,6 +3296,13 @@ export interface operations {
                 };
                 content?: never;
             };
+            /** @description Invalid new window, non-reschedulable status, or class booking */
+            400: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content?: never;
+            };
             /** @description Invalid manage token */
             403: {
                 headers: {
@@ -3272,7 +3310,7 @@ export interface operations {
                 };
                 content?: never;
             };
-            /** @description New slot conflicts */
+            /** @description New slot conflicts or booking already cancelled */
             409: {
                 headers: {
                     [name: string]: unknown;