feat: dual select (provider + model) with default[provider] model default

The inline prompt now renders two <select> boxes:
  - Provider: lists every provider from the cached /config/providers
    response. Default = first provider.
  - Model: lists that provider's model keys (Object.keys of the Record).
    Default = default[providerID] (from the same response) when that
    modelID is present in the provider's models; otherwise the first
    model. Changing the provider select rebuilds the model select with
    the new provider's models and its own default[provider].

On submit the two select values are read separately and passed as
providerId / modelId to the OpenCodeRequest (no more '|' delimiter).
The /opencode-bridge/edit body shape is unchanged (providerId, modelId).

Also fix the index.ts startup console log (p.models is a Record, use
Object.values), and drop the unused _cell field on the prompt widget
(now an unused param).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/__tests__/opencode_cell_actions.spec.ts

@@ -181,17 +181,23 @@ describe('OpenCodeCellActions', () => {
     expect(model.stateChanged.disconnect).toHaveBeenCalled();
   });
 
-  it('renders a model selector with the first option selected when providers are cached', () => {
+  it('renders provider and model selects; model default uses default[provider] when it matches', () => {
     setOpenCodeProviders({
       providers: [
         {
           id: 'anthropic',
+          name: 'Anthropic',
           models: {
-            'claude-sonnet-4-20250514': { id: 'claude-sonnet-4-20250514' }
+            'claude-sonnet-4-20250514': { id: 'claude-sonnet-4-20250514' },
+            'claude-haiku-4-5': { id: 'claude-haiku-4-5' }
           }
         },
         { id: 'openai', models: { 'gpt-5': { id: 'gpt-5' } } }
-      ]
+      ],
+      default: {
+        anthropic: 'claude-sonnet-4-20250514',
+        openai: 'gpt-5'
+      }
     });
     const cell = makeFakeCell('x = 1');
     const actions = new OpenCodeCellActions(cell);
@@ -201,15 +207,103 @@ describe('OpenCodeCellActions', () => {
     const btn = actions.node.querySelector('button') as HTMLButtonElement;
     btn.click();
 
-    const select = cell.node.querySelector(
+    const prompt = cell.node.querySelector(
+      '.opencode-inline-prompt'
+    ) as HTMLElement;
+    const providerSel = prompt.querySelector(
+      '.opencode-provider-select'
+    ) as HTMLSelectElement;
+    const modelSel = prompt.querySelector(
+      '.opencode-model-select'
+    ) as HTMLSelectElement;
+    expect(providerSel).not.toBeNull();
+    expect(modelSel).not.toBeNull();
+
+    // Provider: first provider selected by default.
+    expect(providerSel.options.length).toBe(2);
+    expect(providerSel.options[0].value).toBe('anthropic');
+    expect(providerSel.options[0].textContent).toContain('anthropic');
+    expect(providerSel.options[0].textContent).toContain('Anthropic');
+    expect(providerSel.value).toBe('anthropic');
+
+    // Model: options are that provider's model keys, and the default
+    // matches default['anthropic'] = 'claude-sonnet-4-20250514'.
+    expect(modelSel.options.length).toBe(2);
+    expect(modelSel.options[0].value).toBe('claude-sonnet-4-20250514');
+    expect(modelSel.options[1].value).toBe('claude-haiku-4-5');
+    expect(modelSel.value).toBe('claude-sonnet-4-20250514');
+
+    setOpenCodeProviders(null);
+  });
+
+  it('falls back to the first model when default[provider] is not in models', () => {
+    setOpenCodeProviders({
+      providers: [
+        { id: 'bailian', models: { 'kimi/kimi-k2.7-code': { id: 'kimi/kimi-k2.7-code' } } }
+      ],
+      // default['bailian'] references a modelID not present in models.
+      default: { bailian: 'qwen3.7-plus' }
+    });
+    const cell = makeFakeCell('x = 1');
+    const actions = new OpenCodeCellActions(cell);
+    Object.defineProperty(actions, 'parent', { value: cell, configurable: true });
+    (actions as any).onAfterAttach({} as any);
+
+    const btn = actions.node.querySelector('button') as HTMLButtonElement;
+    btn.click();
+
+    const modelSel = cell.node.querySelector(
       '.opencode-inline-prompt .opencode-model-select'
     ) as HTMLSelectElement;
-    expect(select).not.toBeNull();
-    expect(select.options.length).toBe(2);
-    expect(select.options[0].textContent).toBe('anthropic / claude-sonnet-4-20250514');
-    expect(select.options[1].textContent).toBe('openai / gpt-5');
-    // v3-final: default = first option (no settings).
-    expect(select.value).toBe('anthropic|claude-sonnet-4-20250514');
+    expect(modelSel.value).toBe('kimi/kimi-k2.7-code');
+    setOpenCodeProviders(null);
+  });
+
+  it('rebuilds the model select when the provider select changes', () => {
+    setOpenCodeProviders({
+      providers: [
+        {
+          id: 'anthropic',
+          models: { 'claude-sonnet-4-20250514': { id: 'claude-sonnet-4-20250514' } }
+        },
+        {
+          id: 'openai',
+          models: { 'gpt-5': { id: 'gpt-5' } }
+        }
+      ],
+      default: { openai: 'gpt-5' }
+    });
+    const cell = makeFakeCell('x = 1');
+    const actions = new OpenCodeCellActions(cell);
+    Object.defineProperty(actions, 'parent', { value: cell, configurable: true });
+    (actions as any).onAfterAttach({} as any);
+
+    const btn = actions.node.querySelector('button') as HTMLButtonElement;
+    btn.click();
+
+    const prompt = cell.node.querySelector(
+      '.opencode-inline-prompt'
+    ) as HTMLElement;
+    const providerSel = prompt.querySelector(
+      '.opencode-provider-select'
+    ) as HTMLSelectElement;
+    const modelSel = prompt.querySelector(
+      '.opencode-model-select'
+    ) as HTMLSelectElement;
+
+    // Initial: anthropic, its only model.
+    expect(providerSel.value).toBe('anthropic');
+    expect(modelSel.options.length).toBe(1);
+    expect(modelSel.value).toBe('claude-sonnet-4-20250514');
+
+    // Switch to openai: model select rebuilds with openai's model and
+    // default['openai'] = 'gpt-5' is in openai's models so it matches.
+    providerSel.value = 'openai';
+    providerSel.dispatchEvent(new Event('change'));
+    expect(modelSel.options.length).toBe(1);
+    expect(modelSel.options[0].value).toBe('gpt-5');
+    expect(modelSel.value).toBe('gpt-5');
+
     setOpenCodeProviders(null);
   });
 
@@ -223,6 +317,9 @@ describe('OpenCodeCellActions', () => {
     const btn = actions.node.querySelector('button') as HTMLButtonElement;
     btn.click();
 
+    expect(
+      cell.node.querySelector('.opencode-inline-prompt .opencode-provider-select')
+    ).toBeNull();
     expect(
       cell.node.querySelector('.opencode-inline-prompt .opencode-model-select')
     ).toBeNull();