feat(system): show the library location on the legacy admin page

A line under the admin page's statistics names the database path and why it is there (ComfyUI's user folder, PROMPT_MANAGER_DATA_DIR, config.json, or the node folder with a pointer to Move library), read once from GET /prompt_manager/system/library.

tests/browser/workflows.spec.mjs

@@ -19,6 +19,13 @@ test.afterEach(async ({ page, browserName }) => {
     expect(page.workflowErrors).toEqual([]);
 });
 
+// #249 S6b: the legacy admin page says where the library lives (the fixture's database is configured explicitly).
+test('the admin page names the library location', async ({ page }) => {
+    await page.goto('/prompt_manager/admin');
+    await expect(page.locator('#libraryLocation')).toHaveText('Library: browser.db (set in config.json)');
+    await expect(page.locator('#totalPrompts')).not.toHaveText('-');
+});
+
 test('actual gallery form saves a prompt that the admin page can edit and reload', async ({ page, request }) => {
     await page.goto('/prompt_manager/gallery');
     await page.locator('#addPromptBtn').click();

web/admin.html

@@ -79,6 +79,8 @@
                         </div>
                     </div>
                 </div>
+                <!-- #249 S6b: where the library (database, config.json, backups) lives and why. -->
+                <p class="text-pm-secondary text-xs mt-2" id="libraryLocation" hidden></p>
             </div>
         </div>
 

web/js/admin.js

@@ -297,6 +297,7 @@
                         this.loadTags(),
                         this.loadRecentPrompts(),
                         this.loadSettings(),
+                        this.loadLibraryLocation(),
                     ]);
                 } catch (error) {
                     this.showNotification("Failed to load initial data", "error");
@@ -344,6 +345,29 @@
                 this.listRequest = ApiClient.latestOnly({ lifetime: this.pageLifetime.signal });
             }
 
+            /** #249 S6b: one line under the statistics saying where the library lives and why. */
+            async loadLibraryLocation() {
+                const { signal } = this.pageLifetime;
+                if (signal.aborted) return;
+                const line = document.getElementById("libraryLocation");
+                const reasons = {
+                    default: "ComfyUI's user folder",
+                    environment: "set by PROMPT_MANAGER_DATA_DIR",
+                    config: "set in config.json",
+                    node_folder: "the node folder, where an update or reinstall can delete it; move it from the workspace's System page",
+                };
+                try {
+                    const response = await ApiClient.fetchUrl("/prompt_manager/system/library", { signal });
+                    const data = response.ok ? await response.json() : null;
+                    const location = data && data.location;
+                    if (!line || !location || typeof location.path !== "string") return;
+                    line.textContent = `Library: ${location.path} (${reasons[location.source] || location.source})`;
+                    line.hidden = false;
+                } catch (error) {
+                    if (!signal.aborted) console.error("Library location error:", error);
+                }
+            }
+
             async loadStatistics() {
                 // A leaving page starts no read; one in flight is aborted with the page and not reported.
                 const { signal } = this.pageLifetime;