fix(client): refine table header divider and typography

- replace heavier per-cell header borders with one lighter row divider
- shrink header text to 11px with looser tracking for a more refined feel
- tighten failed-jobs labels: "Fail count" -> "Count", "Last failed at" -> "Last failed"

client/src/Components/design-elements/Table.tsx

@@ -162,14 +162,19 @@ export function DataTable<
 					},
 					"& .MuiTableHead-root .MuiTableRow-root": {
 						height: "28px",
+						borderBottom: "1px solid rgba(0, 0, 0, 0.06)",
+					},
+					"& .MuiTableHead-root .MuiTableCell-root": {
+						borderBottom: "none",
 					},
 					"& :is(th)": {
 						backgroundColor: theme.palette.background.paper,
 						color: theme.palette.text.secondary,
 						fontWeight: 500,
 						textTransform: "uppercase",
+						letterSpacing: "0.08em",
 						padding: `${theme.spacing(SPACING.LG)} ${theme.spacing(LAYOUT.MD)}`,
-						fontSize: theme.typography.fontSize,
+						fontSize: 11,
 					},
 					"& :is(td)": {
 						backgroundColor: theme.palette.background.paper,

client/src/locales/en.json

@@ -883,12 +883,12 @@
 					"method": "Method",
 					"monitorId": "Monitor ID",
 					"runCount": "Run count",
-					"failCount": "Fail count",
+					"failCount": "Count",
 					"lastRunAt": "Last run at",
 					"lockedAt": "Locked at",
 					"lastFinishedAt": "Last finished at",
 					"lastRunTook": "Last run took",
-					"lastFailedAt": "Last failed at",
+					"lastFailedAt": "Last failed",
 					"failReason": "Fail reason"
 				}
 			},