ui/history_view: size Log column to content so file names aren't truncated

The Log column was fixed at 240px with TextTruncate, clipping log file
names like 20260601-100000_<JobName>.log. Measure the widest value and
size the column to fit (bounded 240–520px), recomputing on refresh so
newly recorded events widen the column instead of being cut off.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/ui/history_view.go

@@ -9,6 +9,7 @@ import (
 
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/theme"
 	"fyne.io/fyne/v2/widget"
 )
 
@@ -41,7 +42,38 @@ func collectActivity(jobs []job, runtimes map[int]*domain.JobRuntime) []event {
 	return events
 }
 
-func newHistoryView(events *[]event) *fyne.Container {
+// logColumnMinWidth/logColumnMaxWidth bound the dynamically sized Log column.
+// The minimum keeps the column readable when names are short or absent; the
+// maximum stops a single very long file name from dominating the table (the
+// table still scrolls horizontally past it).
+const (
+	logColumnMinWidth = 240
+	logColumnMaxWidth = 520
+	logColumnPadding  = 24
+)
+
+// logColumnWidth measures the widest Log cell value so the column can be sized
+// to fit its content. Fyne tables do not auto-size columns, so without this the
+// fixed width clips file names like "20260601-100000_SomeJobName.log".
+func logColumnWidth(events []event) float32 {
+	width := float32(logColumnMinWidth)
+	for _, current := range events {
+		text := logFileName(current.LogFile)
+		if text == "" {
+			continue
+		}
+		w := fyne.MeasureText(text, theme.TextSize(), fyne.TextStyle{}).Width + logColumnPadding
+		if w > width {
+			width = w
+		}
+	}
+	if width > logColumnMaxWidth {
+		width = logColumnMaxWidth
+	}
+	return width
+}
+
+func newHistoryView(events *[]event) (*fyne.Container, func()) {
 	descending := false
 	headerText := func(id widget.TableCellID) string {
 		headers := []string{"Time", "Trigger", "Job", "State", "Detail", "Log"}
@@ -107,8 +139,16 @@ func newHistoryView(events *[]event) *fyne.Container {
 	table.SetColumnWidth(2, 170)
 	table.SetColumnWidth(3, 90)
 	table.SetColumnWidth(4, 260)
-	table.SetColumnWidth(5, 240)
-	return container.NewPadded(table)
+	table.SetColumnWidth(5, logColumnWidth(*events))
+
+	// refresh recomputes the content-fit Log column width before redrawing, so
+	// newly recorded events with longer file names widen the column instead of
+	// being truncated.
+	refresh := func() {
+		table.SetColumnWidth(5, logColumnWidth(*events))
+		table.Refresh()
+	}
+	return container.NewPadded(table), refresh
 }
 
 func historyCellText(id widget.TableCellID, events []event) string {