feat(mileage): surface Körjournal in the nav behind a settings toggle (#1540)

* feat(mileage): surface Körjournal in the nav behind a settings toggle

The /mileage page shipped hidden: the route works but no nav row points at
it. Add company_settings.mileage_enabled (mirroring dimensions_enabled) with
a switch in Fönster -> Bokföring, and show the Arbeta nav row when the toggle
is on OR the company already has mileage_trips rows, the same hybrid gate as
webshop orders, so trips created via API/MCP can never become invisible
underlag. UI visibility only, never load-bearing for correctness.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(migrations): move mileage_enabled migration after already-applied 20260812153208

origin/main merged in 20260812153208 which prod has already applied; a new
file sorting before it risks an out-of-order db push abort.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

app/(dashboard)/layout.tsx

@@ -152,6 +152,7 @@ export default async function DashboardLayout({
     { data: allSettingsNames },
     { data: userPrefs },
     hasWebshop,
+    hasMileageTrips,
   ] = await Promise.all([
     supabase.from('companies').select('*').eq('id', companyId).single(),
     supabase.from('company_members').select('role').eq('company_id', companyId).eq('user_id', user.id).single(),
@@ -195,6 +196,16 @@ export default async function DashboardLayout({
       ([woo, orders]) =>
         (woo.data?.length ?? 0) > 0 || (orders.data?.length ?? 0) > 0,
     ),
+    // Whether the company already has mileage trips: OR-ed with the
+    // mileage_enabled settings toggle below so trips created via API/MCP can
+    // never be invisible underlag even if nobody flipped the toggle. Indexed
+    // limit-1 select, same accepted first-paint cost as the webshop gate.
+    supabase
+      .from('mileage_trips')
+      .select('id')
+      .eq('company_id', companyId)
+      .limit(1)
+      .then((trips) => (trips.data?.length ?? 0) > 0),
   ])
 
   // company_id -> current display name for every company the user belongs to.
@@ -267,6 +278,9 @@ export default async function DashboardLayout({
   // mechanism as paysSalaries: UI gate only, never load-bearing for
   // correctness (dimensions plan §2).
   const dimensionsEnabled = settings?.dimensions_enabled ?? false
+  // Körjournal visibility: the settings toggle is the normal way in, existing
+  // trips force the row on so already-created data stays reachable.
+  const hasMileage = (settings?.mileage_enabled ?? false) || hasMileageTrips
   const companyWithName = {
     ...companyRow,
     name: displayName,
@@ -336,6 +350,7 @@ export default async function DashboardLayout({
             paysSalaries={paysSalaries}
             dimensionsEnabled={dimensionsEnabled}
             hasWebshop={hasWebshop}
+            hasMileage={hasMileage}
             isSandbox={isSandbox}
             extensionNavItems={getExtensionNavItems()}
             userName={userProfile?.full_name ?? null}

app/(dashboard)/request-context.ts

@@ -37,7 +37,7 @@ export const getDashboardSettings = cache(async () => {
 
   return supabase
     .from('company_settings')
-    .select('company_name, onboarding_complete, entity_type, pays_salaries, is_sandbox, dimensions_enabled, ore_rounding, initial_setup_path, initial_setup_completed_at, initial_setup_dismissed_at, vat_registered, moms_period')
+    .select('company_name, onboarding_complete, entity_type, pays_salaries, is_sandbox, dimensions_enabled, mileage_enabled, ore_rounding, initial_setup_path, initial_setup_completed_at, initial_setup_dismissed_at, vat_registered, moms_period')
     .eq('company_id', companyId)
     .maybeSingle()
 })

app/api/settings/__tests__/route.test.ts

@@ -97,6 +97,25 @@ describe('PUT /api/settings', () => {
     expect(deadlineMocks.regenerate).not.toHaveBeenCalled()
   })
 
+  it('accepts the mileage_enabled visibility toggle', async () => {
+    enqueueMany([
+      { data: { entity_type: 'enskild_firma', onboarding_complete: true } }, // fetch oldSettings
+      { data: { id: 's1', mileage_enabled: true } },                          // update ... returning
+      { data: null, count: 5 },                                               // deadlines count (has some -> no regen)
+    ])
+
+    const request = createMockRequest('/api/settings', {
+      method: 'PUT',
+      body: { mileage_enabled: true },
+    })
+    const response = await PUT(request, { params: Promise.resolve({}) })
+    const { status, body } = await parseJsonResponse<{ data: { mileage_enabled: boolean } }>(response)
+
+    expect(status).toBe(200)
+    expect(body.data.mileage_enabled).toBe(true)
+    expect(deadlineMocks.regenerate).not.toHaveBeenCalled()
+  })
+
   it('round-trips share capital fields and clears them with null', async () => {
     const updates = { aktiekapital: 25000, antal_aktier: 500 }
     enqueueMany([