FN-6380: widen Activity Log tablet layout

Widen the Activity Log modal at tablet widths so header controls stay reachable.

- Add component-scoped tablet CSS that widens only the Activity Log modal.
- Allow the Activity Log header and action controls to wrap while keeping close pinned right.
- Cover the tablet-only layout contract with a CSS regression test.

Files changed:
 .../__tests__/activity-log-tablet-layout.test.ts   | 73 ++++++++++++++++++++++
 packages/dashboard/app/components/ScriptsModal.css | 49 +++++++++++++++
 2 files changed, 122 insertions(+)

Fusion-Task-Id: FN-6380
Fusion-Task-Lineage: ae7cf5a6-c69d-4756-a4fa-1e4346b9c077

packages/dashboard/app/__tests__/activity-log-tablet-layout.test.ts

@@ -0,0 +1,73 @@
+import { describe, expect, it } from "vitest";
+import { loadAllAppCss } from "../test/cssFixture";
+
+/**
+ * Stylesheet regression test for Activity Log tablet layout.
+ *
+ * The desktop .modal-lg width is too narrow for the Activity Log header at
+ * tablet widths, so a component-scoped tablet media block must widen only the
+ * Activity Log modal and wrap the header controls. If these tablet rules are
+ * removed, refresh/close can be clipped between 769px and 1024px.
+ */
+describe("activity-log-tablet-layout.css", () => {
+  const cssContent = loadAllAppCss();
+
+  function extractTabletMediaBlocks(content: string): string {
+    const blocks: string[] = [];
+    const regex = /@media[^{}]*\(min-width:\s*769px\)[^{}]*\(max-width:\s*1024px\)[^{}]*\{/g;
+    let match: RegExpExecArray | null;
+
+    while ((match = regex.exec(content)) !== null) {
+      const startIdx = match.index + match[0].length;
+      let braceCount = 1;
+      let endIdx = startIdx;
+
+      while (braceCount > 0 && endIdx < content.length) {
+        if (content[endIdx] === "{") braceCount++;
+        if (content[endIdx] === "}") braceCount--;
+        endIdx++;
+      }
+
+      if (braceCount === 0) {
+        blocks.push(content.slice(startIdx, endIdx - 1));
+      }
+    }
+
+    return blocks.join("\n");
+  }
+
+  const tabletCss = extractTabletMediaBlocks(cssContent);
+
+  it("defines tablet Activity Log rules for the broken 769px–1024px range", () => {
+    expect(tabletCss).toContain(".activity-log-modal");
+    expect(tabletCss).toContain(".activity-log-header");
+  });
+
+  it("widens only the Activity Log modal beyond the modal-lg base width", () => {
+    expect(tabletCss).toMatch(/\.activity-log-modal\s*\{[^}]*width:\s*calc\(100vw\s*-\s*var\(--space-2xl\)\)/);
+    expect(tabletCss).toMatch(/\.activity-log-modal\s*\{[^}]*max-width:\s*calc\(100vw\s*-\s*var\(--space-2xl\)\)/);
+  });
+
+  it("does not redefine the global modal-lg width inside the tablet block", () => {
+    expect(tabletCss).not.toMatch(/\.modal-lg\s*\{/);
+  });
+
+  it("allows the Activity Log header to wrap on tablet", () => {
+    expect(tabletCss).toMatch(/\.activity-log-header\s*\{[^}]*flex-wrap:\s*wrap/);
+  });
+
+  it("moves actions to a reachable wrapping row on tablet", () => {
+    expect(tabletCss).toMatch(/\.activity-log-actions\s*\{[^}]*flex:\s*1\s+1\s+100%/);
+    expect(tabletCss).toMatch(/\.activity-log-actions\s*\{[^}]*flex-wrap:\s*wrap/);
+  });
+
+  it("keeps the close button pinned to the top-right row on tablet", () => {
+    expect(tabletCss).toMatch(/\.activity-log-header\s+\.modal-close\s*\{[^}]*order:\s*\d/);
+    expect(tabletCss).toMatch(/\.activity-log-header\s+\.modal-close\s*\{[^}]*margin-left:\s*auto/);
+  });
+
+  it("keeps filters and refresh/clear controls reachable when optional controls render", () => {
+    expect(tabletCss).toMatch(/\.activity-log-filter,\s*\n\s*\.activity-log-filter--project\s*\{[^}]*flex:\s*1\s+1\s+0/);
+    expect(tabletCss).toMatch(/\.activity-log-refresh,\s*\n\s*\.activity-log-clear\s*\{[^}]*flex-shrink:\s*0/);
+  });
+});

packages/dashboard/app/components/ScriptsModal.css

@@ -1595,6 +1595,55 @@
   border-color: var(--ws-error-dark);
 }
 
+/* ── Activity Log — Tablet (769px–1024px) ────────────────────────── */
+
+@media (min-width: 769px) and (max-width: 1024px) {
+  /* Widen only the Activity Log modal; keep the global .modal-lg width unchanged. */
+  .activity-log-modal {
+    width: calc(100vw - var(--space-2xl));
+    max-width: calc(100vw - var(--space-2xl));
+  }
+
+  /* Header: title on left, close on right of top row, actions wrap below. */
+  .activity-log-header {
+    flex-wrap: wrap;
+    gap: var(--space-sm);
+  }
+
+  .activity-log-title {
+    flex: 1 1 auto;
+    order: 0;
+  }
+
+  .activity-log-actions {
+    flex: 1 1 100%;
+    flex-wrap: wrap;
+    gap: var(--space-sm);
+    order: 2;
+  }
+
+  .activity-log-header .modal-close {
+    order: 1;
+    margin-left: auto;
+    flex: 0 0 auto;
+  }
+
+  .activity-log-filter,
+  .activity-log-filter--project {
+    flex: 1 1 0;
+    min-width: 0;
+  }
+
+  .activity-log-filter-select {
+    width: 100%;
+  }
+
+  .activity-log-refresh,
+  .activity-log-clear {
+    flex-shrink: 0;
+  }
+}
+
 /* ── Activity Log — Mobile (≤ 768px) ─────────────────────────────── */
 
 @media (max-width: 768px) {