fix: size DataView list columns by the table's own width (#1713)

* fix: size DataView list columns by the table's own width

The list grid was built from every column, so columns hidden below md/lg
left empty tracks and the visible cells landed under the wrong headers.
Each width now gets a template of only its visible columns (CSS variables
+ container queries on the table, so a narrow panel counts, not the window),
the header uses the same gap as the rows, and rows use a minimum height so
wrapped cells no longer overlap.

* test: wait for the title bar offset effect before asserting

The bar shows once getTitleBarVisible resolves, but --termix-titlebar-height
is set in a later passive effect, so reading it right after findByText raced
(3-5 of 40 runs under load, on main too).

* chore: rerun CI against dev-26.10.6

src/ui/components/data-view.tsx

@@ -14,11 +14,32 @@ export interface DataColumn<T> {
   /** Any grid track: "1fr", "120px", "minmax(0,2fr)". */
   width: string;
   cell: (item: T) => React.ReactNode;
-  /** Dropped below md, for columns that are nice rather than necessary. */
+  /** Hidden when the table itself is narrower than md (48rem) / lg (64rem). */
   hideBelow?: "md" | "lg";
   align?: "start" | "end";
 }
 
+/** Tracks for the columns visible at each width, so hidden ones take no space. */
+function listColumnTemplates<T>(columns: DataColumn<T>[]): {
+  base: string;
+  md: string;
+  lg: string;
+} {
+  return {
+    base:
+      columns
+        .filter((column) => column.hideBelow === undefined)
+        .map((column) => column.width)
+        .join(" ") || "none",
+    md:
+      columns
+        .filter((column) => column.hideBelow !== "lg")
+        .map((column) => column.width)
+        .join(" ") || "none",
+    lg: columns.map((column) => column.width).join(" ") || "none",
+  };
+}
+
 export interface GridColumns {
   base?: number;
   md?: number;
@@ -52,6 +73,9 @@ const XL_COLS: Record<number, string> = {
   4: "xl:grid-cols-4",
 };
 
+const LIST_GRID_CLASS =
+  "grid grid-cols-[var(--data-view-cols)] @min-[48rem]:grid-cols-[var(--data-view-cols-md)] @min-[64rem]:grid-cols-[var(--data-view-cols-lg)] gap-x-2 px-3";
+
 function gridClass(columns: GridColumns): string {
   return cn(
     COLS[columns.base ?? 1],
@@ -61,6 +85,12 @@ function gridClass(columns: GridColumns): string {
   );
 }
 
+function columnVisibility(hideBelow?: "md" | "lg"): string {
+  if (hideBelow === "md") return "hidden @min-[48rem]:block";
+  if (hideBelow === "lg") return "hidden @min-[64rem]:block";
+  return "";
+}
+
 /** One collection as a card grid or a dense row table. */
 export function DataView<T>({
   items,
@@ -120,14 +150,26 @@ export function DataView<T>({
     );
   }
 
-  const template = listColumns.map((c) => c.width).join(" ");
+  const templates = listColumnTemplates(listColumns);
-  const rowHeight = density === "compact" ? "h-7" : "h-9";
+  const rowHeight = density === "compact" ? "min-h-7" : "min-h-9";
 
   return (
-    <div className={cn("border border-border bg-card", className)} role="table">
+    <div
+      className={cn("@container border border-border bg-card", className)}
+      style={
+        {
+          "--data-view-cols": templates.base,
+          "--data-view-cols-md": templates.md,
+          "--data-view-cols-lg": templates.lg,
+        } as React.CSSProperties
+      }
+      role="table"
+    >
       <div
-        className="sticky top-0 z-10 grid items-center border-b border-border bg-card px-3 text-[10px] font-semibold uppercase tracking-widest text-muted-foreground"
+        className={cn(
-        style={{ gridTemplateColumns: template }}
+          LIST_GRID_CLASS,
+          "sticky top-0 z-10 items-center border-b border-border bg-card text-[10px] font-semibold uppercase tracking-widest text-muted-foreground",
+        )}
       >
         {listColumns.map((column) => (
           <span
@@ -135,8 +177,7 @@ export function DataView<T>({
             className={cn(
               "truncate py-2",
               column.align === "end" && "text-right",
-              column.hideBelow === "md" && "hidden md:block",
+              columnVisibility(column.hideBelow),
-              column.hideBelow === "lg" && "hidden lg:block",
             )}
           >
             {column.header}
@@ -152,12 +193,12 @@ export function DataView<T>({
               key={getKey(item)}
               onClick={onRowClick ? () => onRowClick(item) : undefined}
               className={cn(
-                "grid items-center gap-x-2 border-b border-border/50 px-3 text-xs transition-colors last:border-0",
+                LIST_GRID_CLASS,
+                "items-center border-b border-border/50 text-xs transition-colors last:border-0",
                 rowHeight,
                 onRowClick && "cursor-pointer",
                 active ? "bg-accent-brand/10" : "hover:bg-muted/40",
               )}
-              style={{ gridTemplateColumns: template }}
             >
               {listColumns.map((column) => (
                 <div
@@ -165,8 +206,7 @@ export function DataView<T>({
                   className={cn(
                     "min-w-0 truncate",
                     column.align === "end" && "text-right",
-                    column.hideBelow === "md" && "hidden md:block",
+                    columnVisibility(column.hideBelow),
-                    column.hideBelow === "lg" && "hidden lg:block",
                   )}
                 >
                   {column.cell(item)}

src/ui/tests/components/data-view.test.tsx

@@ -1,6 +1,6 @@
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { cleanup, fireEvent, render, screen } from "@testing-library/react";
-import { DataView } from "@/components/data-view";
+import { DataView, type DataColumn } from "@/components/data-view";
 
 afterEach(cleanup);
 
@@ -75,3 +75,133 @@ describe("DataView", () => {
     expect(screen.getByText("nothing")).toBeTruthy();
   });
 });
+
+describe("list grid", () => {
+  const listColumns: DataColumn<(typeof items)[number]>[] = [
+    { key: "a", header: "A", width: "1fr", cell: (item) => `a ${item.name}` },
+    {
+      key: "b",
+      header: "B",
+      width: "90px",
+      hideBelow: "md",
+      cell: (item) => `b ${item.name}`,
+    },
+    { key: "c", header: "C", width: "2fr", cell: (item) => `c ${item.name}` },
+    {
+      key: "d",
+      header: "D",
+      width: "70px",
+      hideBelow: "lg",
+      cell: (item) => `d ${item.name}`,
+    },
+    {
+      key: "e",
+      header: "E",
+      width: "minmax(0,1.2fr)",
+      hideBelow: "md",
+      cell: (item) => `e ${item.name}`,
+    },
+  ];
+
+  function renderList(density?: "compact", columns = listColumns) {
+    render(
+      <DataView
+        items={items}
+        view="list"
+        density={density}
+        getKey={(item) => item.id}
+        renderCard={() => null}
+        columns={{}}
+        listColumns={columns}
+        empty={null}
+      />,
+    );
+    const root = screen.getByRole("table");
+    const header = root.children[0] as HTMLElement;
+    const rows = Array.from(root.children[1].children) as HTMLElement[];
+    return { root, header, rows };
+  }
+
+  it("sets container templates using only columns visible at each breakpoint", () => {
+    const { root } = renderList();
+
+    expect(root.style.getPropertyValue("--data-view-cols")).toBe("1fr 2fr");
+    expect(root.style.getPropertyValue("--data-view-cols-md")).toBe(
+      "1fr 90px 2fr minmax(0,1.2fr)",
+    );
+    expect(root.style.getPropertyValue("--data-view-cols-lg")).toBe(
+      "1fr 90px 2fr 70px minmax(0,1.2fr)",
+    );
+    expect(root.classList.contains("@container")).toBe(true);
+  });
+
+  it("shares grid classes between the header and every body row", () => {
+    const { header, rows } = renderList();
+    const expectedGridClasses = [
+      "grid",
+      "grid-cols-[var(--data-view-cols)]",
+      "@min-[48rem]:grid-cols-[var(--data-view-cols-md)]",
+      "@min-[64rem]:grid-cols-[var(--data-view-cols-lg)]",
+      "gap-x-2",
+    ].sort();
+
+    expect(rows).toHaveLength(items.length);
+    for (const row of [header, ...rows]) {
+      const gridClasses = Array.from(row.classList).filter(
+        (className) =>
+          className === "grid" ||
+          className.includes("grid-cols-") ||
+          className.startsWith("gap-x-"),
+      );
+      expect(gridClasses.sort()).toEqual(expectedGridClasses);
+      expect(row.style.gridTemplateColumns).toBe("");
+    }
+  });
+
+  it("uses container-query visibility for cells and their headers", () => {
+    const { header, rows } = renderList();
+
+    for (const row of [header, ...rows]) {
+      for (const index of [1, 4]) {
+        expect(row.children[index].classList.contains("hidden")).toBe(true);
+        expect(
+          row.children[index].classList.contains("@min-[48rem]:block"),
+        ).toBe(true);
+      }
+      expect(row.children[3].classList.contains("hidden")).toBe(true);
+      expect(row.children[3].classList.contains("@min-[64rem]:block")).toBe(
+        true,
+      );
+      for (const index of [0, 2]) {
+        expect(row.children[index].classList.contains("hidden")).toBe(false);
+      }
+    }
+  });
+
+  it("uses a minimum height for compact rows without a fixed height", () => {
+    const { rows } = renderList("compact");
+
+    for (const row of rows) {
+      expect(row.classList.contains("min-h-7")).toBe(true);
+      expect(row.classList.contains("h-7")).toBe(false);
+    }
+  });
+
+  it("uses the default row minimum height when density is omitted", () => {
+    const { rows } = renderList();
+
+    for (const row of rows) {
+      expect(row.classList.contains("min-h-9")).toBe(true);
+    }
+  });
+
+  it("uses no base tracks when every column is hidden at the base width", () => {
+    const { root } = renderList(undefined, [
+      listColumns[1],
+      listColumns[3],
+      listColumns[4],
+    ]);
+
+    expect(root.style.getPropertyValue("--data-view-cols")).toBe("none");
+  });
+});

src/ui/tests/shell/TitleBar.test.tsx

@@ -46,7 +46,8 @@ describe("TitleBar", () => {
     installBridge();
     render(<TitleBar />);
     expect(await screen.findByText("Termix")).toBeTruthy();
-    expect(heightVar()).toBe("40px");
+    // The offset is set in an effect that can run after the bar shows up.
+    await waitFor(() => expect(heightVar()).toBe("40px"));
   });
 
   it("stays hidden in windows without the app-drawn bar", async () => {