feat(go): M6.2 — adults page (table, filters, credits/debts/unmatched, Pay buttons)

- Extract AssembleAdults(ctx) from ServeAdults so HTML and JSON API share one reconcile path.
- HTMLHandler gains *api.Handler; ServeAdults loads real data and renders adults.tmpl.
- AdultsPageData view model + qrHref/qrHrefAll funcMap (URL-encode /qr params, YYYY-MM→MM/YYYY).
- adults.tmpl: full reconcile table, per-cell status classes + cell-unpaid-current, Pay button hrefs,
  totals row, credits/debts/unmatched sections, filter controls, sheet links.
- static/js/filters.js: NFD-normalize name filter + month-range column hiding; future months hidden by default.
- TestAdultsPage asserts member name and cell text against fixture data.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

go/internal/web/templates/adults.tmpl

@@ -1,5 +1,137 @@
 {{define "title"}}Adults{{end}}
 {{define "content"}}
 <h1>Adults Dashboard</h1>
-<p class="description">Coming in M6.2</p>
+
+{{if .Error}}
+<p class="description error-banner">Error loading data: {{.Error}}</p>
+{{else}}
+
+<div class="filter-container" id="filterContainer" data-current-month="{{.Data.CurrentMonth}}">
+  <div class="filter-item">
+    <label class="filter-label" for="nameFilter">Member</label>
+    <input id="nameFilter" class="filter-input" type="text" placeholder="Filter by name…">
+  </div>
+  <div class="filter-item">
+    <label class="filter-label" for="fromMonth">From</label>
+    <select id="fromMonth" class="filter-select">
+      <option value="">All</option>
+      {{range $i, $m := .Data.Months}}
+      <option value="{{$i}}">{{$m}}</option>
+      {{end}}
+    </select>
+  </div>
+  <div class="filter-item">
+    <label class="filter-label" for="toMonth">To</label>
+    <select id="toMonth" class="filter-select">
+      <option value="">All</option>
+      {{range $i, $m := .Data.Months}}
+      <option value="{{$i}}">{{$m}}</option>
+      {{end}}
+    </select>
+  </div>
+  <div class="filter-item">
+    <button id="applyFilter" class="filter-btn">Apply</button>
+    <button id="clearFilter" class="filter-btn">All</button>
+  </div>
+</div>
+
+{{if .Data.Results}}
+<div class="table-wrapper">
+<table class="reconcile-table">
+  <thead>
+    <tr>
+      <th>Member</th>
+      {{range $i, $m := .Data.Months}}
+      <th data-month-idx="{{$i}}" data-raw-month="{{index $.Data.RawMonths $i}}">{{$m}}</th>
+      {{end}}
+      <th>Balance</th>
+      <th></th>
+    </tr>
+  </thead>
+  <tbody>
+    {{range $row := .Data.Results}}
+    <tr class="member-row" data-name="{{$row.Name}}">
+      <td class="member-name">{{$row.Name}}</td>
+      {{range $i, $cell := $row.Months}}
+      <td class="cell cell-{{$cell.Status}}{{if and (or (eq $cell.Status "unpaid") (eq $cell.Status "partial")) (ge $cell.RawMonth $.Data.CurrentMonth)}} cell-unpaid-current{{end}}{{if $cell.Overridden}} cell-overridden{{end}}"
+          data-month-idx="{{$i}}" title="{{$cell.Tooltip}}">
+        {{$cell.Text}}
+        {{if and (or (eq $cell.Status "unpaid") (eq $cell.Status "partial")) (lt $cell.RawMonth $.Data.CurrentMonth)}}
+        <a class="pay-btn" href="{{qrHref $.Data.BankAccount $cell.Amount $row.Name $cell.RawMonth}}">Pay</a>
+        {{end}}
+      </td>
+      {{end}}
+      <td class="balance-cell{{if lt $row.Balance 0}} balance-negative{{end}}">{{$row.Balance}} CZK</td>
+      <td class="payall-cell">
+        {{if gt $row.PayableAmount 0}}
+        <a class="pay-btn pay-all-btn" href="{{qrHrefAll $.Data.BankAccount $row.PayableAmount $row.Name $row.RawUnpaidPeriods}}">Pay All</a>
+        {{end}}
+      </td>
+    </tr>
+    {{end}}
+    <tr class="totals-row">
+      <td><strong>TOTAL</strong></td>
+      {{range $i, $t := .Data.Totals}}
+      <td class="total-cell total-cell-{{$t.Status}}" data-month-idx="{{$i}}" data-raw-month="{{index $.Data.RawMonths $i}}">{{$t.Text}}</td>
+      {{end}}
+      <td colspan="2"></td>
+    </tr>
+  </tbody>
+</table>
+</div>
+{{else}}
+<p class="description">No members found.</p>
+{{end}}
+
+{{if .Data.Credits}}
+<h2 class="section-header">Credits</h2>
+<ul class="credits-list">
+  {{range .Data.Credits}}
+  <li>{{.Name}}: <strong>+{{.Amount}} CZK</strong></li>
+  {{end}}
+</ul>
+{{end}}
+
+{{if .Data.Debts}}
+<h2 class="section-header">Debts</h2>
+<ul class="debts-list">
+  {{range .Data.Debts}}
+  <li>{{.Name}}: <strong>−{{.Amount}} CZK</strong></li>
+  {{end}}
+</ul>
+{{end}}
+
+{{if .Data.Unmatched}}
+<h2 class="unmatched-header section-header">Unmatched Transactions</h2>
+<table class="unmatched-table">
+  <thead>
+    <tr>
+      <th>Date</th>
+      <th>Amount</th>
+      <th>Sender</th>
+      <th>Message</th>
+    </tr>
+  </thead>
+  <tbody>
+    {{range .Data.Unmatched}}
+    <tr class="unmatched-row">
+      <td>{{.Date}}</td>
+      <td>{{printf "%.0f" .Amount}} CZK</td>
+      <td>{{.Sender}}</td>
+      <td>{{.Message}}</td>
+    </tr>
+    {{end}}
+  </tbody>
+</table>
+{{end}}
+
+<p class="sheet-links">
+  <a href="{{.Data.AttendanceURL}}" target="_blank" rel="noopener">[Attendance sheet]</a>
+  &middot;
+  <a href="{{.Data.PaymentsURL}}" target="_blank" rel="noopener">[Payments sheet]</a>
+</p>
+
+{{end}}
+
+<script src="/static/js/filters.js" defer></script>
 {{end}}