fix: clip overflowing conference link in dashboard table (#790)

The Conference cell is a grid item with the default min-width:auto,
so a long unbroken URL forces the grid track wider than its
minmax(140px, 1fr) size and bleeds visually into the Status column.
Clip it with overflow:hidden/ellipsis and expose the full value via
a title attribute.

test/dashboard-conference-overflow.test.js

@@ -0,0 +1,49 @@
+const { expect } = require("chai");
+const fs = require("fs");
+const path = require("path");
+
+/**
+ * Regression test for the dashboard "Conference" column overflowing into
+ * the "Status" column.
+ *
+ * Root cause: `.cell-conf` is a CSS grid item with the default
+ * `min-width: auto`, so an unbreakable long string (e.g. a conference URL)
+ * forces the grid track wider than its `minmax(140px, 1fr)` track size,
+ * visually bleeding into the next cell instead of being clipped.
+ */
+
+const cssPath = path.join(__dirname, "..", "public", "css", "style.css");
+const htmlPath = path.join(__dirname, "..", "public", "partials", "dashboard.htm");
+
+function getRuleBody(css, selector) {
+  const index = css.indexOf(selector);
+  expect(index, `selector "${selector}" not found in style.css`).to.be.greaterThan(-1);
+  const start = css.indexOf("{", index);
+  const end = css.indexOf("}", start);
+  return css.slice(start + 1, end);
+}
+
+describe("dashboard .cell-conf overflow fix", function () {
+  const css = fs.readFileSync(cssPath, "utf8");
+
+  it("clips overflowing conference text instead of letting it bleed into other cells", function () {
+    const rule = getRuleBody(css, ".paper-table .cell-conf {");
+    expect(rule).to.match(/min-width:\s*0/);
+    expect(rule).to.match(/overflow:\s*hidden/);
+    expect(rule).to.match(/text-overflow:\s*ellipsis/);
+    expect(rule).to.match(/white-space:\s*nowrap/);
+  });
+
+  it("keeps the fix in the stacked mobile layout too", function () {
+    const mobileSectionStart = css.indexOf("@media (max-width: 900px)");
+    const mobileRule = getRuleBody(css.slice(mobileSectionStart), ".paper-table .cell-conf {");
+    expect(mobileRule).to.match(/overflow:\s*hidden/);
+    expect(mobileRule).to.match(/text-overflow:\s*ellipsis/);
+    expect(mobileRule).to.match(/white-space:\s*nowrap/);
+  });
+
+  it("exposes the full conference value via a title attribute for truncated text", function () {
+    const html = fs.readFileSync(htmlPath, "utf8");
+    expect(html).to.match(/cell-conf[\s\S]*?title="\{\{item\.conference\}\}"/);
+  });
+});