Home: spread the activity table's slack, shorten its counts, shorten the fade

The trend column carried `w-full`, which made it swallow every spare pixel:
the five columns beside it huddled in the left 40% with a dead gap before the
curve. It takes a bounded third now, so the auto layout spreads the rest over
the columns that have content to show, and a long flow name still widens its
own column into the card's scroll.

`si` reaches the rollup counts it was written for — 179240 executions reads as
"179k", and the failure badge and the failures tile follow. The plain window
leaves the small ones alone: 615 is still 615. The standing counts (nodes,
flows running, queue depth) stay exact, as does everything acted on digit by
digit.

The fade ran a full 40 of the 100-unit box. In a table cell three times the
width of a panel that washed out readings still worth seeing, so it is 25 —
a hint at the left end rather than a quarter of the series.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XC2jX6Hdj7pxGGKzBTrbqB

frontend/src/components/Common/Sparkline.tsx

@@ -9,8 +9,14 @@ const PAD = 8
 /** Above this ratio a linear series is all baseline and one spike. */
 const LOG_RATIO = 100
 
-/** How far the left end fades over, in viewBox units. */
-const FADE = 40
+/**
+ * How far the left end fades over, in viewBox units — a quarter of the width.
+ *
+ * Proportional, so it reads the same in a panel and in a table cell three
+ * times as wide. Any more and a wide curve loses readings that are still
+ * part of what the series says.
+ */
+const FADE = 25
 
 /** Enough digits to tell two neighbouring readings apart. */
 const READOUT_DIGITS = 4

frontend/src/components/Health/HealthOverview.tsx

@@ -113,7 +113,7 @@ export function HealthOverview() {
           />
           <Tile
             label="Failures (24h)"
-            value={String(summary?.failures_24h ?? 0)}
+            value={si(summary?.failures_24h ?? 0)}
             note={
               failures?.length
                 ? `latest ${ago(failures[0].ts)}`
@@ -137,7 +137,7 @@ export function HealthOverview() {
         <h2 className={PANEL_SECTION}>Flow activity (24h)</h2>
         <div className={`${CARD} overflow-x-auto`}>
           {/* The name anchors the left, the numbers read down their own
-              centre, and the trend takes whatever width is left over. */}
+              centre, and the trend closes the row on the right. */}
           <table className="w-full text-sm">
             <thead className="text-xs text-muted-foreground">
               <tr>
@@ -148,7 +148,10 @@ export function HealthOverview() {
                 <th className="px-3 pb-2 text-center font-medium">Errors</th>
                 <th className="px-3 pb-2 text-center font-medium">Avg</th>
                 <th className="px-3 pb-2 text-center font-medium">Lag</th>
-                <th className="w-full min-w-32 pb-2 pl-3 text-right font-medium">
+                {/* A bounded share rather than all the slack: the columns
+                    beside it grow with their own content, so the numbers
+                    spread across the middle instead of huddling on the left. */}
+                <th className="w-1/3 min-w-32 pb-2 pl-3 text-right font-medium">
                   Trend
                 </th>
               </tr>
@@ -165,10 +168,14 @@ export function HealthOverview() {
                       {row.flow || "—"}
                     </Link>
                   </td>
-                  <td className="px-3 py-2 text-center">{row.executions}</td>
+                  <td className="px-3 py-2 text-center">
+                    {si(row.executions)}
+                  </td>
                   <td className="px-3 py-2 text-center">
                     {row.errors ? (
-                      <Badge variant="destructive">{row.errors} failed</Badge>
+                      <Badge variant="destructive">
+                        {si(row.errors)} failed
+                      </Badge>
                     ) : (
                       <span className="text-muted-foreground">none</span>
                     )}

frontend/src/lib/utils.ts

@@ -24,9 +24,11 @@ const SI_STEPS: [number, string][] = [
  * keeps a reading in its column, and beyond giga or micro the exponent is.
  *
  * Where it applies: anything read at a glance and bounded by the width of a
- * tile, a table cell, an axis gutter or a legend. Exact counts (executions,
- * failures) and anything the user is about to act on — a payload, a form
- * field, the edge inspector's value — stay unrounded.
+ * tile, a table cell, an axis gutter or a legend — a rollup's own counts
+ * included, since 179240 executions is a size, not a number anyone reads
+ * digit by digit. What the user acts on stays unrounded: a payload, a form
+ * field, the edge inspector's value, and the standing counts (nodes, flows
+ * running, queue depth) that are small by nature and exact by meaning.
  */
 export function si(value: number, digits = 3): string {
   if (!Number.isFinite(value)) return "--"