panel/dashboard: drop the caveat and the status line under the co-op chart

Nathan: the disclaimers are not necessary, especially now that reporting is in
place going forward — and then, on the status line under it: remove that too.

Gone from both apps: the explanatory note paragraph, its per-metric config
strings, the status line ("55 days - 2 not measured"), the now-orphaned CSS for
both, and the gaps counter that only fed the status line. The period toggles
still say what range is on screen, so no information is lost.

The harness assertions that described the status line are replaced by stronger
ones: the rendered chart must contain no caveat text at all, and the 30-day view
must still end at the most recent measured day.

app/main.py

@@ -385,7 +385,6 @@ PAGE_HTML = """<!DOCTYPE html>
   .coop-trend { border: 1px solid var(--border, #e4e0d8); border-radius: 12px; padding: 14px 16px 12px; margin-bottom: 20px; }
   .coop-trend-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
   .coop-trend-title { font-weight: 700; font-size: 15px; color: var(--ink, #2d3327); }
-  .coop-trend-sub { color: var(--muted); font-size: 12px; }
   .coop-trend-controls { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 10px; }
   .trend-group { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
   .coop-trend-body svg { display: block; width: 100%; height: auto; overflow: visible; }
@@ -562,7 +561,6 @@ PAGE_HTML = """<!DOCTYPE html>
       <div class="coop-trend">
         <div class="coop-trend-head">
           <span class="coop-trend-title" id="trend-title">The co-op over time</span>
-          <span class="coop-trend-sub" id="trend-sub"></span>
         </div>
         <div class="coop-trend-controls">
           <span class="trend-group">
@@ -579,7 +577,6 @@ PAGE_HTML = """<!DOCTYPE html>
           </span>
         </div>
         <div id="trend-body" class="coop-trend-body"><div class="empty">Loading</div></div>
-        <p class="board-note" id="trend-note" style="margin:8px 0 0;"></p>
       </div>
       <div class="board-note">Usage across the co-op, last 30 days</div>
       <div style="display:flex; align-items:center; gap:10px; margin-bottom:10px;">
@@ -808,12 +805,9 @@ let trendMetric = "members";   // members | requests | spend
 let trendDays = 90;            // 0 = all time
 
 const TREND_CONF = {
-  members:  { kind: "line", title: "The co-op over time",
+  members:  { kind: "line", title: "The co-op over time" },
-              note: "How many members the co-op has had, day by day. A gap means days that were never measured, not zero members." },
+  requests: { kind: "bar",  title: "Requests the co-op served" },
-  requests: { kind: "bar",  title: "Requests the co-op served",
+  spend:    { kind: "bar",  title: "What the co-op spent" }
-              note: "AI requests served to members each day. Days we did not record are gaps, not zeroes." },
-  spend:    { kind: "bar",  title: "What the co-op spent",
-              note: "Spend charged to the co-op each day, in US dollars. Days we did not record are gaps, not zeroes." }
 };
 
 async function loadMetrics() {
@@ -882,10 +876,8 @@ function renderTrends() {
   const have = vals.filter(v => v !== null && v !== undefined);
   if (have.length < 2) {
     host.innerHTML = "<div class=empty>Not enough history yet.</div>";
-    $("trend-sub").textContent = "";
     return;
   }
-  const gaps = vals.length - have.length;
   const maxV = Math.max.apply(null, have);
   const step = niceStep((maxV <= 0 ? 1 : maxV * 1.08) / 4);
   const top = step * 4;
@@ -941,8 +933,6 @@ function renderTrends() {
   }
   parts.push("</svg>");
   host.innerHTML = parts.join("");
-  $("trend-sub").textContent = rows.length + " days" + (gaps > 0 ? " - " + gaps + " not measured" : "");
-  $("trend-note").textContent = conf.note;
 }
 
 let usageMode = 'mine'; // 'mine' | 'coop'