cover reschedule failure states

frontend/website/cypress/e2e/set-scheduling.cy.ts

@@ -585,6 +585,12 @@ describe('set scheduling', () => {
       cy.get('input[value="middle"]').should('be.checked')
       cy.get('input[value="end"]').check()
     })
+    cy.viewport(375, 667)
+    cy.document().then((document) => {
+      expect(document.documentElement.scrollWidth).to.be.at.most(
+        document.documentElement.clientWidth,
+      )
+    })
     cy.get('[data-reschedule-form]').submit()
     cy.wait('@reschedule')
 
@@ -648,6 +654,31 @@ describe('set scheduling', () => {
     cy.get('[data-reschedule-toggle]').should('not.exist')
   })
 
+  it('keeps the current plan visible when rescheduling fails', () => {
+    cy.clock(new Date(2026, 7, 15, 12).getTime(), ['Date'])
+    cy.intercept('GET', '**/api/schedules/73', {
+      statusCode: 200,
+      body: rescheduleSourceDetail,
+    }).as('schedule')
+    cy.intercept('PATCH', '**/api/schedules/73', {
+      statusCode: 500,
+      body: { error: 'Rescheduling is temporarily unavailable.' },
+    }).as('reschedule')
+
+    cy.visit('/schedules/73')
+    cy.wait('@me')
+    cy.wait('@schedule')
+    cy.get('[data-reschedule-toggle]').click()
+    cy.get('[data-reschedule-form]').submit()
+    cy.wait('@reschedule')
+
+    cy.get('[data-reschedule-form]')
+      .should('be.visible')
+      .and('contain.text', 'Rescheduling is temporarily unavailable.')
+    cy.get('.schedule-range').should('contain.text', 'Aug 10, 2026 to Aug 20, 2026')
+    cy.get('[data-reschedule-announcement]').should('have.text', '')
+  })
+
   it('completes and reopens assignments from the schedule', () => {
     const completedAt = '2026-08-15T12:30:00+00:00'
     cy.intercept('GET', '**/api/schedules/73', {