feat(account): replace tier control with amount input + guidance chips

app/pages/member/account.vue

@@ -236,14 +236,42 @@
             <PageSection>
               <div class="section-label">Change Contribution</div>
 
-              <TierPicker v-model="selectedTier" :tiers="tiers" />
+              <div class="form-group">
+                <label class="form-label" for="account-contribution">
+                  {{ cadence === 'annual' ? 'Annual' : 'Monthly' }} Contribution
+                </label>
+                <div class="contribution-input-row">
+                  <span class="contribution-currency">$</span>
+                  <input
+                    id="account-contribution"
+                    v-model.number="form.contributionAmount"
+                    type="number"
+                    min="0"
+                    step="1"
+                    inputmode="numeric"
+                    class="contribution-input"
+                  >
+                </div>
+                <div class="contribution-presets" role="group" aria-label="Suggested amounts">
+                  <button
+                    v-for="preset in CONTRIBUTION_PRESETS"
+                    :key="preset.amount"
+                    type="button"
+                    class="contribution-preset-chip"
+                    @click="form.contributionAmount = preset.amount"
+                  >
+                    ${{ preset.amount }}
+                  </button>
+                </div>
+                <p v-if="guidanceLabel" class="contribution-guidance">{{ guidanceLabel }}</p>
+              </div>
               <div class="tier-hint">
                 Changes take effect on your next billing cycle
               </div>
               <button
                 class="btn btn-primary btn-section"
                 :disabled="
-                  selectedTier === Number(memberData.contributionTier || 0) ||
+                  form.contributionAmount === Number(memberData.contributionAmount || 0) ||
                   isUpdating
                 "
                 @click="handleUpdateTier"
@@ -277,7 +305,7 @@
 </template>
 
 <script setup>
-import { getTierAmount, getContributionTierByValue } from '~/config/contributions';
+import { CONTRIBUTION_PRESETS, getGuidanceLabel, requiresPayment } from '~/config/contributions';
 
 definePageMeta({
   middleware: "auth",
@@ -289,7 +317,7 @@ const { initializeHelcimPay, verifyPayment, cleanup: cleanupHelcimPay } = useHel
 const toast = useToast();
 const helcimPortalUrl = useRuntimeConfig().public.helcimPortalUrl || '';
 
-const selectedTier = ref(0);
+const form = reactive({ contributionAmount: 0 });
 const selectedCircle = ref("");
 const isUpdating = ref(false);
 const isCancelling = ref(false);
@@ -315,37 +343,19 @@ const canChangeCard = computed(() => {
   if (!m.helcimCustomerId) return false;
   if (!["active", "pending_payment"].includes(m.status)) return false;
   // $0 tier has no subscription to attach a card to
-  if (String(m.contributionTier || "0") === "0") return false;
+  if (!requiresPayment(Number(m.contributionAmount || 0))) return false;
   return true;
 });
 
-const BASE_TIERS = [
-  { amount: 0, label: "I need support right now" },
-  { amount: 5, label: "I can contribute" },
-  { amount: 15, label: "I can sustain the community" },
-  { amount: 30, label: "I can support others too" },
-  { amount: 50, label: "I want to sponsor multiple members" },
-];
+const cadence = computed(() => memberData.value?.billingCadence || 'monthly');
 
-const tiers = computed(() => {
-  const cadence = memberData.value?.billingCadence || 'monthly';
-  return BASE_TIERS.map((t) => {
-    if (t.amount === 0) return { ...t, display: '$0' };
-    const suffix = cadence === 'annual' ? '/yr' : '/mo';
-    return {
-      ...t,
-      display: `$${getTierAmount(t, cadence)}${suffix}`,
-      subtitle: cadence === 'annual' ? `$${t.amount}/mo tier` : null,
-    };
-  });
-});
+const guidanceLabel = computed(() => getGuidanceLabel(form.contributionAmount));
 
 const currentContributionLabel = computed(() => {
-  const tier = getContributionTierByValue(String(memberData.value?.contributionTier || '0'));
-  const cadence = memberData.value?.billingCadence || 'monthly';
-  if (!tier || tier.amount === 0) return '$0';
-  const amount = getTierAmount(tier, cadence);
-  return cadence === 'annual' ? `$${amount} / year` : `$${amount} / month`;
+  const amount = Number(memberData.value?.contributionAmount || 0);
+  if (!amount) return '$0';
+  const displayAmount = cadence.value === 'annual' ? amount * 12 : amount;
+  return cadence.value === 'annual' ? `$${displayAmount} / year` : `$${displayAmount} / month`;
 });
 
 const circleOptions = [
@@ -380,7 +390,7 @@ const capitalise = (s) => (s ? s.charAt(0).toUpperCase() + s.slice(1) : s);
 // Initialize from member data
 watchEffect(() => {
   if (memberData.value) {
-    selectedTier.value = Number(memberData.value.contributionTier || 0);
+    form.contributionAmount = Number(memberData.value.contributionAmount || 0);
     selectedCircle.value = memberData.value.circle || "community";
   }
 });
@@ -399,8 +409,8 @@ const handleUpdateTier = async () => {
     await $fetch("/api/members/update-contribution", {
       method: "POST",
       body: {
-        contributionTier: String(selectedTier.value),
-        cadence: memberData.value?.billingCadence || 'monthly',
+        contributionAmount: form.contributionAmount,
+        cadence: cadence.value,
       },
     });
     await checkMemberStatus();
@@ -409,13 +419,13 @@ const handleUpdateTier = async () => {
     // Paid upgrade without a saved card — route to payment setup instead of erroring.
     if (err.data?.data?.requiresPaymentSetup) {
       await navigateTo(
-        `/member/payment-setup?tier=${selectedTier.value}&circle=${
+        `/member/payment-setup?tier=${form.contributionAmount}&circle=${
           selectedCircle.value || memberData.value?.circle || 'community'
         }`,
       );
       return;
     }
-    selectedTier.value = Number(memberData.value?.contributionTier || 0);
+    form.contributionAmount = Number(memberData.value?.contributionAmount || 0);
     toast.add({
       title: "Update failed",
       description: err.data?.statusMessage || "Please try again.",
@@ -797,6 +807,52 @@ const confirmCancelMembership = async () => {
   margin-bottom: 12px;
 }
 
+/* ---- CONTRIBUTION AMOUNT INPUT + CHIPS ---- */
+.contribution-input-row {
+  display: flex;
+  align-items: center;
+  gap: 0.25rem;
+}
+.contribution-currency {
+  font-weight: 600;
+}
+.contribution-input {
+  flex: 1;
+  padding: 0.5rem 0.75rem;
+  background: var(--input-bg);
+  border: 1px solid var(--parch);
+  font-family: 'Commit Mono', monospace;
+  font-size: 1rem;
+}
+.contribution-input:focus {
+  outline: none;
+  border-color: var(--candle);
+}
+.contribution-presets {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.5rem;
+  margin-top: 0.5rem;
+}
+.contribution-preset-chip {
+  padding: 0.25rem 0.75rem;
+  background: transparent;
+  border: 1px dashed var(--parch);
+  font-family: 'Commit Mono', monospace;
+  font-size: 0.875rem;
+  cursor: pointer;
+}
+.contribution-preset-chip:hover {
+  border-style: solid;
+  border-color: var(--candle);
+}
+.contribution-guidance {
+  margin-top: 0.5rem;
+  font-size: 0.875rem;
+  font-style: italic;
+  color: var(--ink-soft, currentColor);
+}
+
 .btn-section {
   width: 100%;
   text-align: center;