diff --git a/src/app/(dashboard)/[orgSlug]/billing/page.tsx b/src/app/(dashboard)/[orgSlug]/billing/page.tsx
index 7974127..3f1c719 100644
--- a/src/app/(dashboard)/[orgSlug]/billing/page.tsx
+++ b/src/app/(dashboard)/[orgSlug]/billing/page.tsx
@@ -29,7 +29,6 @@ export default function BillingPage() {
       <div className="grid gap-4 sm:grid-cols-2">
         <CurrentSpend
           baseCost={usage?.base_cost ?? 0}
-          tokenCost={usage?.token_cost ?? 0}
           totalCost={usage?.total_cost ?? 0}
           creditBalance={credits?.credit_balance_eur}
           autoTopupFailed={credits?.auto_topup_failed}
diff --git a/src/components/billing/current-spend.tsx b/src/components/billing/current-spend.tsx
index 8c699bc..ac5a707 100644
--- a/src/components/billing/current-spend.tsx
+++ b/src/components/billing/current-spend.tsx
@@ -4,7 +4,6 @@ import { AlertTriangle } from 'lucide-react'
 
 interface CurrentSpendProps {
   baseCost: number
-  tokenCost: number
   totalCost: number
   creditBalance?: number
   autoTopupFailed?: boolean
@@ -12,7 +11,6 @@ interface CurrentSpendProps {
 
 export function CurrentSpend({
   baseCost,
-  tokenCost,
   totalCost,
   creditBalance,
   autoTopupFailed,
diff --git a/src/components/layout/sidebar-state.tsx b/src/components/layout/sidebar-state.tsx
index 1e54b6d..3e79ebe 100644
--- a/src/components/layout/sidebar-state.tsx
+++ b/src/components/layout/sidebar-state.tsx
@@ -13,14 +13,13 @@ interface SidebarStateContextValue {
 const SidebarStateContext = createContext<SidebarStateContextValue | null>(null)
 
 export function SidebarStateProvider({ children }: { children: React.ReactNode }) {
-  const [collapsed, setCollapsed] = useState(false)
-  const [hydrated, setHydrated] = useState(false)
-
-  useEffect(() => {
-    const stored = window.localStorage.getItem(SIDEBAR_STORAGE_KEY)
-    if (stored === 'true') setCollapsed(true)
-    setHydrated(true)
-  }, [])
+  const [collapsed, setCollapsed] = useState(() => {
+    if (typeof window !== 'undefined') {
+      return window.localStorage.getItem(SIDEBAR_STORAGE_KEY) === 'true'
+    }
+    return false
+  })
+  const [hydrated] = useState(() => typeof window !== 'undefined')
 
   useEffect(() => {
     if (hydrated) {
diff --git a/src/lib/credits/balance.test.ts b/src/lib/credits/balance.test.ts
index ce715f6..819afbe 100644
--- a/src/lib/credits/balance.test.ts
+++ b/src/lib/credits/balance.test.ts
@@ -18,7 +18,7 @@ vi.mock('@/lib/db/schema', () => ({
 import { getBalance, checkSufficientBalance, deductCredits, addCredits } from './balance'
 
 function mockSelectChain(balance: string) {
-  const chain: Record<string, any> = {}
+  const chain: Record<string, unknown> = {}
   chain.from = vi.fn(() => chain)
   chain.where = vi.fn(() => chain)
   chain.limit = vi.fn(() => Promise.resolve([{ balance }]))
@@ -35,7 +35,7 @@ describe('getBalance', () => {
   })
 
   it('returns 0 when no org found', async () => {
-    const chain: Record<string, any> = {}
+    const chain: Record<string, unknown> = {}
     chain.from = vi.fn(() => chain)
     chain.where = vi.fn(() => chain)
     chain.limit = vi.fn(() => Promise.resolve([]))
diff --git a/src/lib/credits/balance.ts b/src/lib/credits/balance.ts
index 2e4a9d0..b947b37 100644
--- a/src/lib/credits/balance.ts
+++ b/src/lib/credits/balance.ts
@@ -1,5 +1,5 @@
 import { db } from '@/lib/db'
-import { organizations, creditTransactions } from '@/lib/db/schema'
+import { organizations } from '@/lib/db/schema'
 import { eq, sql } from 'drizzle-orm'
 
 interface DeductMeta {
diff --git a/src/lib/stripe/ensure-customer.test.ts b/src/lib/stripe/ensure-customer.test.ts
index bc9515a..7538858 100644
--- a/src/lib/stripe/ensure-customer.test.ts
+++ b/src/lib/stripe/ensure-customer.test.ts
@@ -51,6 +51,7 @@ describe('ensureStripeCustomer', () => {
 
   it('returns existing stripe_customer_id if valid in current mode', async () => {
     const org = makeOrg({ stripe_customer_id: 'cus_existing' })
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
     vi.mocked(stripe.customers.retrieve).mockResolvedValue({ id: 'cus_existing' } as any)
     const result = await ensureStripeCustomer(org)
 
@@ -62,10 +63,12 @@ describe('ensureStripeCustomer', () => {
   it('creates new customer if existing ID is from wrong Stripe mode', async () => {
     const org = makeOrg({ stripe_customer_id: 'cus_live_mode_id' })
     vi.mocked(stripe.customers.retrieve).mockRejectedValue(new Error('No such customer'))
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
     vi.mocked(stripe.customers.create).mockResolvedValue({ id: 'cus_test_new' } as any)
 
     const mockEq = vi.fn().mockResolvedValue({ data: null, error: null })
     const mockUpdate = vi.fn(() => ({ eq: mockEq }))
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
     vi.mocked(supabaseAdmin.from).mockReturnValue({ update: mockUpdate } as any)
 
     const result = await ensureStripeCustomer(org)
@@ -76,10 +79,12 @@ describe('ensureStripeCustomer', () => {
 
   it('creates a Stripe customer when none exists', async () => {
     const org = makeOrg({ stripe_customer_id: null })
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
     vi.mocked(stripe.customers.create).mockResolvedValue({ id: 'cus_new123' } as any)
 
     const mockEq = vi.fn().mockResolvedValue({ data: null, error: null })
     const mockUpdate = vi.fn(() => ({ eq: mockEq }))
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
     vi.mocked(supabaseAdmin.from).mockReturnValue({ update: mockUpdate } as any)
 
     const result = await ensureStripeCustomer(org)
diff --git a/src/lib/stripe/webhooks.test.ts b/src/lib/stripe/webhooks.test.ts
index 8a477f6..4ca9ae9 100644
--- a/src/lib/stripe/webhooks.test.ts
+++ b/src/lib/stripe/webhooks.test.ts
@@ -47,7 +47,9 @@ vi.mock('@/lib/constants', () => ({
 
 import { handleStripeEvent } from './webhooks'
 
-function chainMock(returnValue: unknown) {
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+function chainMock(returnValue: unknown): Record<string, any> {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
   const chain: Record<string, any> = {}
   const terminal = () => Promise.resolve(returnValue)
   const methods = ['from', 'select', 'update', 'insert', 'eq', 'in', 'single', 'order', 'limit']
@@ -181,7 +183,7 @@ describe('handleStripeEvent', () => {
   describe('payment_intent.succeeded', () => {
     it('adds credits for credit_topup payment intents', async () => {
       const txnChain = chainMock({ data: [], error: null })
-      txnChain.single = undefined as any
+      txnChain.single = undefined as unknown
       txnChain.limit = vi.fn(() => Promise.resolve({ data: [], error: null }))
       const orgChain = chainMock({ data: null, error: null })
 
diff --git a/src/lib/stripe/webhooks.ts b/src/lib/stripe/webhooks.ts
index a3ce2b2..f723242 100644
--- a/src/lib/stripe/webhooks.ts
+++ b/src/lib/stripe/webhooks.ts
@@ -198,7 +198,7 @@ async function handlePaymentIntentFailed(pi: Stripe.PaymentIntent): Promise<void
     .eq('id', orgId)
 }
 
-async function handleSubscriptionCreated(_sub: Stripe.Subscription): Promise<void> {
+async function handleSubscriptionCreated(_sub: Stripe.Subscription): Promise<void> { // eslint-disable-line @typescript-eslint/no-unused-vars
   // Instance creation is handled in handleCheckoutCompleted.
 }