diff --git a/scripts/api.js b/scripts/api.js
new file mode 100644
index 00000000..15559416
--- /dev/null
+++ b/scripts/api.js
@@ -0,0 +1,7 @@
+export const api = {
+  fetchApi: (...args) => fetch(...args),
+  addEventListener: (eventName, handler) => document.addEventListener(eventName, handler),
+  removeEventListener: (eventName, handler) => document.removeEventListener(eventName, handler),
+};
+
+export default api;
diff --git a/scripts/app.js b/scripts/app.js
new file mode 100644
index 00000000..53957e20
--- /dev/null
+++ b/scripts/app.js
@@ -0,0 +1,12 @@
+export const app = {
+  canvas: { ds: { scale: 1 } },
+  extensionManager: {
+    toast: {
+      add: () => {},
+    },
+  },
+  registerExtension: () => {},
+  graphToPrompt: async () => ({ workflow: { nodes: new Map() } }),
+};
+
+export default app;
diff --git a/static/js/statistics.js b/static/js/statistics.js
index 930199aa..74ce2207 100644
--- a/static/js/statistics.js
+++ b/static/js/statistics.js
@@ -5,7 +5,7 @@ import { showToast } from './utils/uiHelpers.js';
 // Chart.js import (assuming it's available globally or via CDN)
 // If Chart.js isn't available, we'll need to add it to the project
 
-class StatisticsManager {
+export class StatisticsManager {
     constructor() {
         this.charts = {};
         this.data = {};
diff --git a/tests/frontend/components/autocomplete.behavior.test.js b/tests/frontend/components/autocomplete.behavior.test.js
new file mode 100644
index 00000000..742fdf16
--- /dev/null
+++ b/tests/frontend/components/autocomplete.behavior.test.js
@@ -0,0 +1,139 @@
+import { describe, it, beforeEach, afterEach, expect, vi } from 'vitest';
+
+const {
+  API_MODULE,
+  APP_MODULE,
+  CARET_HELPER_MODULE,
+  PREVIEW_COMPONENT_MODULE,
+  AUTOCOMPLETE_MODULE,
+} = vi.hoisted(() => ({
+  API_MODULE: new URL('../../../scripts/api.js', import.meta.url).pathname,
+  APP_MODULE: new URL('../../../scripts/app.js', import.meta.url).pathname,
+  CARET_HELPER_MODULE: new URL('../../../web/comfyui/textarea_caret_helper.js', import.meta.url).pathname,
+  PREVIEW_COMPONENT_MODULE: new URL('../../../web/comfyui/loras_widget_components.js', import.meta.url).pathname,
+  AUTOCOMPLETE_MODULE: new URL('../../../web/comfyui/autocomplete.js', import.meta.url).pathname,
+}));
+
+const fetchApiMock = vi.fn();
+const caretHelperInstance = {
+  getBeforeCursor: vi.fn(() => ''),
+  getCursorOffset: vi.fn(() => ({ left: 0, top: 0 })),
+};
+
+const previewTooltipMock = {
+  show: vi.fn(),
+  hide: vi.fn(),
+  cleanup: vi.fn(),
+};
+
+vi.mock(API_MODULE, () => ({
+  api: {
+    fetchApi: fetchApiMock,
+  },
+}));
+
+vi.mock(APP_MODULE, () => ({
+  app: {
+    canvas: {
+      ds: { scale: 1 },
+    },
+  },
+}));
+
+vi.mock(CARET_HELPER_MODULE, () => ({
+  TextAreaCaretHelper: vi.fn(() => caretHelperInstance),
+}));
+
+vi.mock(PREVIEW_COMPONENT_MODULE, () => ({
+  PreviewTooltip: vi.fn(() => previewTooltipMock),
+}));
+
+describe('AutoComplete widget interactions', () => {
+  beforeEach(() => {
+    document.body.innerHTML = '';
+    document.head.querySelectorAll('style').forEach((styleEl) => styleEl.remove());
+    Element.prototype.scrollIntoView = vi.fn();
+    fetchApiMock.mockReset();
+    caretHelperInstance.getBeforeCursor.mockReset();
+    caretHelperInstance.getCursorOffset.mockReset();
+    caretHelperInstance.getBeforeCursor.mockReturnValue('');
+    caretHelperInstance.getCursorOffset.mockReturnValue({ left: 0, top: 0 });
+    previewTooltipMock.show.mockReset();
+    previewTooltipMock.hide.mockReset();
+    previewTooltipMock.cleanup.mockReset();
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  it('fetches and renders search results when input exceeds the minimum characters', async () => {
+    vi.useFakeTimers();
+
+    fetchApiMock.mockResolvedValue({
+      json: () => Promise.resolve({ success: true, relative_paths: ['models/example.safetensors'] }),
+    });
+
+    caretHelperInstance.getBeforeCursor.mockReturnValue('example');
+    caretHelperInstance.getCursorOffset.mockReturnValue({ left: 15, top: 25 });
+
+    const input = document.createElement('textarea');
+    document.body.append(input);
+
+    const { AutoComplete } = await import(AUTOCOMPLETE_MODULE);
+    const autoComplete = new AutoComplete(input, 'loras', { debounceDelay: 0, showPreview: false });
+
+    input.value = 'example';
+    input.dispatchEvent(new Event('input', { bubbles: true }));
+
+    await vi.runAllTimersAsync();
+    await Promise.resolve();
+
+    expect(fetchApiMock).toHaveBeenCalledWith('/lm/loras/relative-paths?search=example&limit=20');
+    const items = autoComplete.dropdown.querySelectorAll('.comfy-autocomplete-item');
+    expect(items).toHaveLength(1);
+    expect(autoComplete.dropdown.style.display).toBe('block');
+    expect(autoComplete.isVisible).toBe(true);
+    expect(caretHelperInstance.getCursorOffset).toHaveBeenCalled();
+  });
+
+  it('inserts the selected LoRA with usage tip strengths and restores focus', async () => {
+    fetchApiMock.mockImplementation((url) => {
+      if (url.includes('usage-tips-by-path')) {
+        return Promise.resolve({
+          ok: true,
+          json: () => Promise.resolve({
+            success: true,
+            usage_tips: JSON.stringify({ strength: '1.5', clip_strength: '0.9' }),
+          }),
+        });
+      }
+
+      return Promise.resolve({
+        json: () => Promise.resolve({ success: true, relative_paths: ['models/example.safetensors'] }),
+      });
+    });
+
+    caretHelperInstance.getBeforeCursor.mockReturnValue('alpha, example');
+
+    const input = document.createElement('textarea');
+    input.value = 'alpha, example';
+    input.selectionStart = input.value.length;
+    input.focus = vi.fn();
+    input.setSelectionRange = vi.fn();
+    document.body.append(input);
+
+    const { AutoComplete } = await import(AUTOCOMPLETE_MODULE);
+    const autoComplete = new AutoComplete(input, 'loras', { debounceDelay: 0, showPreview: false });
+
+    await autoComplete.insertSelection('models/example.safetensors');
+
+    expect(fetchApiMock).toHaveBeenCalledWith(
+      '/lm/loras/usage-tips-by-path?relative_path=models%2Fexample.safetensors',
+    );
+    expect(input.value).toContain('<lora:example:1.5:0.9>, ');
+    expect(autoComplete.dropdown.style.display).toBe('none');
+    expect(input.focus).toHaveBeenCalled();
+    expect(input.setSelectionRange).toHaveBeenCalled();
+  });
+});
diff --git a/tests/frontend/components/lorasWidgetEvents.interactions.test.js b/tests/frontend/components/lorasWidgetEvents.interactions.test.js
new file mode 100644
index 00000000..44d62448
--- /dev/null
+++ b/tests/frontend/components/lorasWidgetEvents.interactions.test.js
@@ -0,0 +1,108 @@
+import { describe, it, beforeEach, afterEach, expect, vi } from 'vitest';
+
+const {
+  EVENTS_MODULE,
+  API_MODULE,
+  APP_MODULE,
+  COMPONENTS_MODULE,
+} = vi.hoisted(() => ({
+  EVENTS_MODULE: new URL('../../../web/comfyui/loras_widget_events.js', import.meta.url).pathname,
+  API_MODULE: new URL('../../../scripts/api.js', import.meta.url).pathname,
+  APP_MODULE: new URL('../../../scripts/app.js', import.meta.url).pathname,
+  COMPONENTS_MODULE: new URL('../../../web/comfyui/loras_widget_components.js', import.meta.url).pathname,
+}));
+
+vi.mock(API_MODULE, () => ({
+  api: {},
+}));
+
+vi.mock(APP_MODULE, () => ({
+  app: {},
+}));
+
+vi.mock(COMPONENTS_MODULE, () => ({
+  createMenuItem: vi.fn(),
+  createDropIndicator: vi.fn(),
+}));
+
+describe('LoRA widget drag interactions', () => {
+  beforeEach(() => {
+    document.body.innerHTML = '';
+    const dragStyle = document.getElementById('comfy-lora-drag-style');
+    if (dragStyle) {
+      dragStyle.remove();
+    }
+  });
+
+  afterEach(() => {
+    document.body.classList.remove('comfy-lora-dragging');
+  });
+
+  it('adjusts a single LoRA strength while syncing collapsed clip strength', async () => {
+    const { handleStrengthDrag } = await import(EVENTS_MODULE);
+
+    const widget = {
+      value: [
+        { name: 'Test', strength: 0.5, clipStrength: 0.25, expanded: false },
+      ],
+      callback: vi.fn(),
+    };
+
+    handleStrengthDrag('Test', 0.5, 100, { clientX: 140 }, widget, false);
+
+    expect(widget.value[0].strength).toBeCloseTo(0.54, 2);
+    expect(widget.value[0].clipStrength).toBeCloseTo(0.54, 2);
+    expect(widget.callback).toHaveBeenCalledWith(widget.value);
+  });
+
+  it('applies proportional drag updates to all LoRAs', async () => {
+    const { handleAllStrengthsDrag } = await import(EVENTS_MODULE);
+
+    const widget = {
+      value: [
+        { name: 'A', strength: 0.4, clipStrength: 0.4 },
+        { name: 'B', strength: 0.6, clipStrength: 0.6 },
+      ],
+      callback: vi.fn(),
+    };
+
+    const initialStrengths = [
+      { modelStrength: 0.4, clipStrength: 0.4 },
+      { modelStrength: 0.6, clipStrength: 0.6 },
+    ];
+
+    handleAllStrengthsDrag(initialStrengths, 100, { clientX: 160 }, widget);
+
+    expect(widget.value[0].strength).toBeCloseTo(0.41, 2);
+    expect(widget.value[1].strength).toBeCloseTo(0.62, 2);
+    expect(widget.callback).toHaveBeenCalledWith(widget.value);
+  });
+
+  it('initiates drag gestures, updates strength, and clears cursor state on mouseup', async () => {
+    const module = await import(EVENTS_MODULE);
+    const renderSpy = vi.fn();
+    const previewSpy = { hide: vi.fn() };
+
+    const dragEl = document.createElement('div');
+    dragEl.className = 'comfy-lora-entry';
+    document.body.append(dragEl);
+
+    const widget = {
+      value: [{ name: 'Test', strength: 0.5, clipStrength: 0.5 }],
+      callback: vi.fn(),
+    };
+
+    module.initDrag(dragEl, 'Test', widget, false, previewSpy, renderSpy);
+
+    dragEl.dispatchEvent(new MouseEvent('mousedown', { clientX: 50, bubbles: true }));
+    expect(document.body.classList.contains('comfy-lora-dragging')).toBe(true);
+
+    document.dispatchEvent(new MouseEvent('mousemove', { clientX: 70, bubbles: true }));
+    expect(renderSpy).toHaveBeenCalledWith(widget.value, widget);
+    expect(previewSpy.hide).toHaveBeenCalled();
+    expect(widget.value[0].strength).not.toBe(0.5);
+
+    document.dispatchEvent(new MouseEvent('mouseup'));
+    expect(document.body.classList.contains('comfy-lora-dragging')).toBe(false);
+  });
+});
diff --git a/tests/frontend/pages/statistics.dashboard.test.js b/tests/frontend/pages/statistics.dashboard.test.js
new file mode 100644
index 00000000..a6a94a50
--- /dev/null
+++ b/tests/frontend/pages/statistics.dashboard.test.js
@@ -0,0 +1,142 @@
+import { describe, it, beforeEach, afterEach, expect, vi } from 'vitest';
+import { renderTemplate, resetDom } from '../utils/domFixtures.js';
+
+const { CORE_MODULE, UI_HELPERS_MODULE, STATISTICS_MODULE } = vi.hoisted(() => ({
+  CORE_MODULE: new URL('../../../static/js/core.js', import.meta.url).pathname,
+  UI_HELPERS_MODULE: new URL('../../../static/js/utils/uiHelpers.js', import.meta.url).pathname,
+  STATISTICS_MODULE: new URL('../../../static/js/statistics.js', import.meta.url).pathname,
+}));
+
+const appCoreInitializeMock = vi.fn();
+const showToastMock = vi.fn();
+
+vi.mock(CORE_MODULE, () => ({
+  appCore: {
+    initialize: appCoreInitializeMock,
+  },
+}));
+
+vi.mock(UI_HELPERS_MODULE, () => ({
+  showToast: showToastMock,
+}));
+
+describe('Statistics dashboard rendering', () => {
+  beforeEach(() => {
+    resetDom();
+    appCoreInitializeMock.mockResolvedValue();
+    showToastMock.mockReset();
+    globalThis.Chart = undefined;
+  });
+
+  afterEach(() => {
+    delete window.statsManager;
+  });
+
+  it('hydrates dashboard panels with fetched data and wires tab interactions', async () => {
+    renderTemplate('statistics.html');
+
+    const dataset = {
+      '/api/lm/stats/collection-overview': {
+        data: {
+          total_models: 4,
+          total_size: 4096,
+          total_generations: 200,
+          lora_count: 2,
+          checkpoint_count: 1,
+          embedding_count: 1,
+          unused_loras: 1,
+          unused_checkpoints: 0,
+          unused_embeddings: 0,
+          lora_size: 2048,
+          checkpoint_size: 1024,
+          embedding_size: 1024,
+        },
+      },
+      '/api/lm/stats/usage-analytics': {
+        data: {
+          top_loras: [
+            { name: 'Lora A', base_model: 'SDXL', folder: 'loras', usage_count: 10 },
+          ],
+          top_checkpoints: [
+            { name: 'Checkpoint A', base_model: 'SDXL', folder: 'checkpoints', usage_count: 5 },
+          ],
+          top_embeddings: [
+            { name: 'Embedding A', base_model: 'SDXL', folder: 'embeddings', usage_count: 7 },
+          ],
+          usage_timeline: [
+            { date: '2024-01-01', lora_usage: 5, checkpoint_usage: 3, embedding_usage: 2 },
+          ],
+        },
+      },
+      '/api/lm/stats/base-model-distribution': {
+        data: {
+          loras: { SDXL: 2 },
+          checkpoints: { SDXL: 1 },
+          embeddings: { SDXL: 1 },
+        },
+      },
+      '/api/lm/stats/tag-analytics': {
+        data: {
+          top_tags: [
+            { tag: 'anime', count: 5 },
+            { tag: 'photo', count: 3 },
+          ],
+          total_unique_tags: 2,
+        },
+      },
+      '/api/lm/stats/storage-analytics': {
+        data: {
+          loras: [
+            { name: 'Lora A', base_model: 'SDXL', size: 2048, usage_count: 10 },
+          ],
+          checkpoints: [
+            { name: 'Checkpoint A', base_model: 'SDXL', size: 1024, usage_count: 5 },
+          ],
+          embeddings: [],
+        },
+      },
+      '/api/lm/stats/insights': {
+        data: {
+          insights: [
+            {
+              type: 'info',
+              title: 'Balance usage',
+              description: 'Redistribute usage across models.',
+              suggestion: 'Try lesser-used checkpoints.',
+            },
+          ],
+        },
+      },
+    };
+
+    const { StatisticsManager } = await import(STATISTICS_MODULE);
+    const manager = new StatisticsManager();
+    const refreshSpy = vi.spyOn(manager, 'refreshChartsInPanel');
+    vi.spyOn(manager, 'fetchData').mockImplementation((endpoint) => Promise.resolve(dataset[endpoint]));
+
+    await manager.initialize();
+
+    expect(manager.initialized).toBe(true);
+    expect(document.querySelectorAll('.metric-card').length).toBeGreaterThan(0);
+    expect(document.querySelector('#topLorasList .model-item')).not.toBeNull();
+    expect(document.querySelector('#tagCloud').textContent).toContain('anime');
+    expect(document.querySelector('#insightsList .insight-card')).not.toBeNull();
+
+    const usageButton = document.querySelector('.tab-button[data-tab="usage"]');
+    usageButton.click();
+
+    expect(refreshSpy).toHaveBeenCalledWith('usage');
+    expect(document.getElementById('usage-panel').classList.contains('active')).toBe(true);
+    expect(document.querySelector('.tab-button.active').dataset.tab).toBe('usage');
+  });
+
+  it('surfaces an error toast when statistics data fails to load', async () => {
+    const { StatisticsManager } = await import(STATISTICS_MODULE);
+    const manager = new StatisticsManager();
+    vi.spyOn(manager, 'fetchData').mockRejectedValue(new Error('unavailable'));
+
+    await manager.loadAllData();
+
+    expect(showToastMock).toHaveBeenCalledWith('toast.general.statisticsLoadFailed', {}, 'error');
+  });
+});
diff --git a/tests/frontend/utils/uiHelpers.dom.test.js b/tests/frontend/utils/uiHelpers.dom.test.js
new file mode 100644
index 00000000..94739553
--- /dev/null
+++ b/tests/frontend/utils/uiHelpers.dom.test.js
@@ -0,0 +1,108 @@
+import { describe, it, beforeEach, afterEach, expect, vi } from 'vitest';
+
+const {
+  I18N_MODULE,
+  STATE_MODULE,
+  STORAGE_MODULE,
+  CONSTANTS_MODULE,
+  EVENT_MANAGER_MODULE,
+  UI_HELPERS_MODULE,
+} = vi.hoisted(() => ({
+  I18N_MODULE: new URL('../../../static/js/utils/i18nHelpers.js', import.meta.url).pathname,
+  STATE_MODULE: new URL('../../../static/js/state/index.js', import.meta.url).pathname,
+  STORAGE_MODULE: new URL('../../../static/js/utils/storageHelpers.js', import.meta.url).pathname,
+  CONSTANTS_MODULE: new URL('../../../static/js/utils/constants.js', import.meta.url).pathname,
+  EVENT_MANAGER_MODULE: new URL('../../../static/js/utils/EventManager.js', import.meta.url).pathname,
+  UI_HELPERS_MODULE: new URL('../../../static/js/utils/uiHelpers.js', import.meta.url).pathname,
+}));
+
+const translateMock = vi.fn((key, _params, fallback) => fallback || key);
+const getStorageItemMock = vi.fn();
+const setStorageItemMock = vi.fn();
+
+vi.mock(I18N_MODULE, () => ({
+  translate: translateMock,
+}));
+
+vi.mock(STATE_MODULE, () => ({
+  state: {},
+  getCurrentPageState: vi.fn(),
+}));
+
+vi.mock(STORAGE_MODULE, () => ({
+  getStorageItem: getStorageItemMock,
+  setStorageItem: setStorageItemMock,
+}));
+
+vi.mock(CONSTANTS_MODULE, () => ({
+  NODE_TYPE_ICONS: {},
+  DEFAULT_NODE_COLOR: '#ffffff',
+}));
+
+vi.mock(EVENT_MANAGER_MODULE, () => ({
+  eventManager: {
+    emit: vi.fn(),
+    on: vi.fn(),
+    off: vi.fn(),
+    addHandler: vi.fn(),
+    removeHandler: vi.fn(),
+  },
+}));
+
+describe('UI helper DOM utilities', () => {
+  beforeEach(() => {
+    document.body.innerHTML = '';
+    document.body.removeAttribute('data-theme');
+    document.documentElement.removeAttribute('data-theme');
+    getStorageItemMock.mockReset();
+    setStorageItemMock.mockReset();
+    translateMock.mockReset();
+    globalThis.requestAnimationFrame = (cb) => cb();
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  it('creates toast elements and cleans them up after timeout', async () => {
+    vi.useFakeTimers();
+    translateMock.mockReturnValue('Toast message');
+
+    const { showToast } = await import(UI_HELPERS_MODULE);
+
+    showToast('uiHelpers.clipboard.copied', {}, 'success');
+
+    const container = document.querySelector('.toast-container');
+    expect(container).not.toBeNull();
+    expect(container.querySelectorAll('.toast')).toHaveLength(1);
+
+    await Promise.resolve();
+    vi.advanceTimersByTime(2000);
+
+    const toast = container.querySelector('.toast');
+    toast.dispatchEvent(new Event('transitionend', { bubbles: true }));
+    await Promise.resolve();
+
+    expect(toast.classList.contains('show')).toBe(false);
+  });
+
+  it('toggles the persisted theme and updates DOM attributes', async () => {
+    getStorageItemMock.mockReturnValue('light');
+    document.body.innerHTML = '<button class="theme-toggle"></button>';
+    globalThis.matchMedia = vi.fn(() => ({
+      matches: false,
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn(),
+    }));
+
+    const { toggleTheme } = await import(UI_HELPERS_MODULE);
+
+    const nextTheme = toggleTheme();
+
+    expect(nextTheme).toBe('dark');
+    expect(setStorageItemMock).toHaveBeenCalledWith('theme', 'dark');
+    expect(document.documentElement.getAttribute('data-theme')).toBe('dark');
+    expect(document.body.dataset.theme).toBe('dark');
+    expect(document.querySelector('.theme-toggle').classList.contains('theme-dark')).toBe(true);
+  });
+});