fix: table-layout fixed + consistent column widths

- table-layout: fixed on the table wrapper so browser respects explicit widths
- All cells (header + rows) now use the same col.width consistently
- Subject column no longer special-cased for width

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

web/src/app/page.tsx

@@ -891,7 +891,7 @@ function TicketWorkbenchContent() {
             ) : (
               <>
                 {/* Table layout for consistent column alignment */}
-                <div style={{ display: "table", width: "100%" }}>
+                <div style={{ display: "table", width: "100%", tableLayout: "fixed" }}>
                   {/* Column header */}
                   <div className={cn(
                     "sticky top-0 z-10 border-b border-border bg-muted/50",
@@ -953,7 +953,7 @@ function TicketWorkbenchContent() {
                         {availableColumns.filter((c) => c.visible).map((col) => {
                           const cellStyle = {
                             display: "table-cell" as const,
-                            width: col.key === "subject" ? undefined : col.width,
+                            width: col.width,
                             verticalAlign: "middle" as const,
                             padding: density === "compact" ? "4px 12px" : "8px 12px",
                           };