feat(freight): non-terminal change-request review + unified customer timeline

Backoffice can now "Request changes" on a pending settings change
request without rejecting it outright: a new ChangesRequested status
keeps the row open so the customer's next edit appends into the same
request instead of starting a fresh cycle, and the reviewer's note
persists across that round instead of being cleared on resubmit.

Version History and Review History (previously two separate,
differently-shaped lists) are merged into one chronological timeline
under a new History tab, including document changes shown as a real
previous-vs-current diff (both files openable).

Bug fixes surfaced while wiring this up:
- Replacing a single-file document slot left the old file live
  alongside the new one instead of retiring it (customer settings +
  onboarding uploads).
- The "previous" file in a document diff 404'd once superseded —
  the preview route now also matches soft-deleted records.
- A document replace was recorded twice in the timeline (once at
  upload, once again at change-request approval).

apps/edr-freight-web/backoffice/src/pages/customers/CustomerDetailPage.tsx

@@ -23,6 +23,7 @@ import {
   Download,
   Eye,
   FileText,
+  History,
   Hourglass,
   IdCard,
   LayoutGrid,
@@ -39,8 +40,8 @@ import {
   BookingStatusBadge,
   ChangeRequestPendingBadge,
   ChangeRequestReview,
-  CompanyRevisionHistory,
   CompanyStatusBadge,
+  CompanyTimeline,
   CompanyTypeBadge,
   InvoiceStatusBadge,
   PaymentStatusBadge,
@@ -717,6 +718,9 @@ export default function CustomerDetailPage() {
           <Tabs.Tab value="invoices" leftSection={<Receipt size={16} />}>
             Invoices
           </Tabs.Tab>
+          <Tabs.Tab value="history" leftSection={<History size={16} />}>
+            History
+          </Tabs.Tab>
         </Tabs.List>
 
         {/* OVERVIEW */}
@@ -738,7 +742,6 @@ export default function CustomerDetailPage() {
             )}
 
             <ChangeRequestReview company={company} />
-            <CompanyRevisionHistory companyId={company.id} />
 
             <KpiStrip
               items={[
@@ -1287,6 +1290,11 @@ export default function CustomerDetailPage() {
             </Box>
           </Box>
         </Tabs.Panel>
+
+        {/* HISTORY */}
+        <Tabs.Panel value="history" pt="lg">
+          <CompanyTimeline company={company} />
+        </Tabs.Panel>
       </Tabs>
 
       <RequestDocumentChangeModal