refactor(delete): make undo unconditional, remove undo toggle and button delay

- Remove delete_undo_enabled setting (backend default, frontend state,
  settings modal UI, 10 locales); staged deletes with 30s undo are now
  the only delete path and stale settings keys are silently ignored
- Remove the 1500ms delete-button arm delay (armDeleteButton) from all
  delete modals; misclicks are recoverable via the undo toast
- Delete modal always shows the recoverable warning
- Log the first staged file path in staging log lines for easier support

tests/frontend/utils/i18nHelpers.test.js

@@ -66,9 +66,6 @@ describe('translate() with real en.json locale', () => {
     it('resolves delete-model modal keys with interpolation', () => {
         installWindowI18n();
 
-        expect(translate('modals.deleteModel.permanentWarning')).toBe(
-            'This will permanently delete the file from disk.',
-        );
         expect(translate('modals.deleteModel.recoverableWarning')).toBe(
             'This will permanently delete the file after 30 seconds unless you undo.',
         );
@@ -77,14 +74,6 @@ describe('translate() with real en.json locale', () => {
         );
     });
 
-    it('resolves the delete-undo settings label', () => {
-        installWindowI18n();
-
-        expect(translate('settings.deleteUndoEnabled')).toBe(
-            'Keep deleted items recoverable for 30 seconds (undo)',
-        );
-    });
-
     it('returns the raw key when no translation exists (fallback contract)', () => {
         installWindowI18n();
         const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});

tests/frontend/utils/modalUtils.test.js

@@ -1,4 +1,4 @@
-import { describe, it, beforeEach, afterEach, expect, vi } from 'vitest';
+import { describe, it, beforeEach, expect, vi } from 'vitest';
 
 const {
   MODAL_UTILS_MODULE,
@@ -7,7 +7,6 @@ const {
   UI_HELPERS_MODULE,
   I18N_MODULE,
   UNDO_HELPERS_MODULE,
-  STATE_MODULE,
 } = vi.hoisted(() => ({
   MODAL_UTILS_MODULE: new URL('../../../static/js/utils/modalUtils.js', import.meta.url).pathname,
   MODAL_MANAGER_MODULE: new URL('../../../static/js/managers/ModalManager.js', import.meta.url).pathname,
@@ -15,7 +14,6 @@ const {
   UI_HELPERS_MODULE: new URL('../../../static/js/utils/uiHelpers.js', import.meta.url).pathname,
   I18N_MODULE: new URL('../../../static/js/utils/i18nHelpers.js', import.meta.url).pathname,
   UNDO_HELPERS_MODULE: new URL('../../../static/js/utils/undoHelpers.js', import.meta.url).pathname,
-  STATE_MODULE: new URL('../../../static/js/state/index.js', import.meta.url).pathname,
 }));
 
 const deleteModelMock = vi.fn();
@@ -136,75 +134,6 @@ describe('modalUtils confirmDelete undo flow', () => {
   });
 });
 
-describe('modalUtils armDeleteButton delay-activate', () => {
-  beforeEach(() => {
-    vi.useFakeTimers();
-    deleteModelMock.mockReset();
-    showModalMock.mockReset();
-    closeModalMock.mockReset();
-    document.body.innerHTML = `
-      <div class="model-card" data-filepath="/models/foo.safetensors" data-name="Foo Model"></div>
-      <div id="deleteModal">
-        <div class="delete-model-info"></div>
-        <button class="cancel-btn">Cancel</button>
-        <button class="delete-btn">Delete</button>
-      </div>
-    `;
-  });
-
-  afterEach(() => {
-    vi.useRealTimers();
-  });
-
-  it('opens with the delete button disabled and enables it after exactly 1500ms', async () => {
-    const { showDeleteModal } = await import(MODAL_UTILS_MODULE);
-
-    showDeleteModal('/models/foo.safetensors');
-
-    const deleteBtn = document.querySelector('#deleteModal .delete-btn');
-    expect(deleteBtn.disabled).toBe(true);
-
-    vi.advanceTimersByTime(1499);
-    expect(deleteBtn.disabled).toBe(true);
-
-    vi.advanceTimersByTime(1);
-    expect(deleteBtn.disabled).toBe(false);
-  });
-
-  it('clicking the disabled delete button fires nothing', async () => {
-    const { showDeleteModal } = await import(MODAL_UTILS_MODULE);
-
-    showDeleteModal('/models/foo.safetensors');
-
-    const deleteBtn = document.querySelector('#deleteModal .delete-btn');
-    deleteBtn.click();
-
-    expect(deleteBtn.disabled).toBe(true);
-    expect(deleteModelMock).not.toHaveBeenCalled();
-  });
-
-  it('closing during the countdown clears the timer and reopening re-arms a full 1500ms', async () => {
-    const { showDeleteModal, closeDeleteModal } = await import(MODAL_UTILS_MODULE);
-
-    showDeleteModal('/models/foo.safetensors');
-    const deleteBtn = document.querySelector('#deleteModal .delete-btn');
-
-    vi.advanceTimersByTime(1400);
-    closeDeleteModal();
-    expect(closeModalMock).toHaveBeenCalledWith('deleteModal');
-
-    // Reopen — the stale timer must not enable the button early
-    showDeleteModal('/models/foo.safetensors');
-    expect(deleteBtn.disabled).toBe(true);
-
-    vi.advanceTimersByTime(1499);
-    expect(deleteBtn.disabled).toBe(true);
-
-    vi.advanceTimersByTime(1);
-    expect(deleteBtn.disabled).toBe(false);
-  });
-});
-
 describe('modalUtils showDeleteModal warning copy and size line', () => {
   beforeEach(() => {
     showModalMock.mockReset();
@@ -220,19 +149,11 @@ describe('modalUtils showDeleteModal warning copy and size line', () => {
     `;
   });
 
-  afterEach(async () => {
-    const { state } = await import(STATE_MODULE);
-    state.global.settings.delete_undo_enabled = true;
-  });
-
   function modelInfoHtml() {
     return document.querySelector('#deleteModal .delete-model-info').innerHTML;
   }
 
-  it('shows the recoverable warning when delete_undo_enabled is truthy', async () => {
-    const { state } = await import(STATE_MODULE);
-    state.global.settings.delete_undo_enabled = true;
-
+  it('always shows the recoverable warning', async () => {
     const { showDeleteModal } = await import(MODAL_UTILS_MODULE);
     showDeleteModal('/models/foo.safetensors');
 
@@ -240,27 +161,6 @@ describe('modalUtils showDeleteModal warning copy and size line', () => {
     expect(modelInfoHtml()).not.toContain('modals.deleteModel.permanentWarning');
   });
 
-  it('shows the permanent warning when delete_undo_enabled is falsy', async () => {
-    const { state } = await import(STATE_MODULE);
-    state.global.settings.delete_undo_enabled = false;
-
-    const { showDeleteModal } = await import(MODAL_UTILS_MODULE);
-    showDeleteModal('/models/foo.safetensors');
-
-    expect(modelInfoHtml()).toContain('modals.deleteModel.permanentWarning');
-    expect(modelInfoHtml()).not.toContain('modals.deleteModel.recoverableWarning');
-  });
-
-  it('falls back to the neutral permanent warning when the setting is unavailable', async () => {
-    const { state } = await import(STATE_MODULE);
-    delete state.global.settings.delete_undo_enabled;
-
-    const { showDeleteModal } = await import(MODAL_UTILS_MODULE);
-    showDeleteModal('/models/foo.safetensors');
-
-    expect(modelInfoHtml()).toContain('modals.deleteModel.permanentWarning');
-  });
-
   it('appends a formatted "Frees {size}" line when the card carries a file size', async () => {
     translateMock.mockImplementation((key, params) =>
       params && params.size ? `${key} ${params.size}` : key