Rename credits "Increase" button to "Manage" (#23840)

The green primary button in the Credits section was labelled "Increase"
with an up-arrow icon, but it opens the credit package picker, whose
slider spans every available package including smaller ones. So the
label promised upgrade-only while the modal supports both directions.

Renamed it to "Manage" and swapped the up arrow for `IconAdjustments`
(sliders), matching the slider-based picker it opens.

The secondary shortcut buttons ("Increase to $100", "Increase to $200")
are unchanged since those really do apply an upgrade directly.

---
_Generated by [Claude
Code](https://claude.ai/code/session_01CmtdBmWL9eSD3ZX7tgzisZ)_

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packages/twenty-front/src/modules/settings/billing/components/internal/ResourceCreditPriceSelector.tsx

@@ -14,7 +14,12 @@ import { styled } from '@linaria/react';
 import { t } from '@lingui/core/macro';
 import { type ChangeEvent, useMemo, useState } from 'react';
 import { isDefined } from 'twenty-shared/utils';
-import { IconArrowUp, IconCircleX, IconCreditCard } from 'twenty-ui/icon';
+import {
+  IconAdjustments,
+  IconArrowUp,
+  IconCircleX,
+  IconCreditCard,
+} from 'twenty-ui/icon';
 import { Button } from 'twenty-ui/input';
 import { themeCssVariables } from 'twenty-ui/theme-constants';
 import {
@@ -316,7 +321,7 @@ export const ResourceCreditPriceSelector = ({
   const PrimaryActionIcon =
     shouldRedirectToUpdatePayment || shouldRedirectToManageBilling
       ? IconCreditCard
-      : IconArrowUp;
+      : IconAdjustments;
   const handlePrimaryActionClick = () => {
     if (redirectToRequiredBillingAction()) {
       return;
@@ -373,7 +378,7 @@ export const ResourceCreditPriceSelector = ({
                 ? t`Update payment`
                 : shouldRedirectToManageBilling
                   ? t`Manage billing`
-                  : t`Increase`
+                  : t`Manage`
             }
             variant="primary"
             accent="green"