feat(FN-4227): add clickable file path links across dashboard

- Add reusable file path linkification utilities and FileBrowser context wiring across dashboard modals and log surfaces
- Linkify task detail, review, workflow, chat, activity, agent, dev server, and settings sync outputs so workspace paths open in the file browser
- Preserve inline code styling when wrapping detected paths and extend FileBrowserModal handling for linked navigation
- Cover the new linking behavior with dashboard tests and add a changeset plus AGENTS guidance for the reusable pattern

Fusion-Task-Id: FN-4227

packages/dashboard/app/utils/filePathLinkify.css

@@ -0,0 +1,30 @@
+.file-path-link {
+  display: inline;
+  white-space: normal;
+  overflow-wrap: anywhere;
+  word-break: break-word;
+  padding: 0 var(--space-xs);
+  border: 0;
+  border-radius: var(--radius-sm);
+  background: transparent;
+  color: var(--color-info);
+  text-decoration: underline dotted;
+  cursor: pointer;
+  font: inherit;
+}
+
+.file-path-link:hover {
+  background: color-mix(in srgb, var(--color-info) 12%, transparent);
+}
+
+.file-path-link:focus-visible {
+  outline: none;
+  box-shadow: var(--focus-ring-strong);
+}
+
+@media (max-width: 768px) {
+  .file-path-link {
+    padding-block: var(--space-md);
+    margin-block: calc(var(--space-md) * -1);
+  }
+}