feat: add Claude and Codex effort controls (#943)

* feat: add Claude and Codex effort controls

* refactor: generic provider effort handling

* fix: reconcile provider effort after model changes

* fix: pass effort through external agent api

* feat: add effort support for opencode

* chore: update gpt fallback models

* fix: use portal for showing effort dropdown

---------

Co-authored-by: Haileyesus <118998054+blackmammoth@users.noreply.github.com>

src/components/chat/constants/providerEffort.ts

@@ -0,0 +1,13 @@
+import type { LLMProvider, ProviderModelOption } from '../../../types/app';
+
+export const DEFAULT_EFFORT_VALUE = 'default';
+
+export const FALLBACK_PROVIDER_EFFORT_VALUES: Partial<Record<LLMProvider, readonly string[]>> = {
+  claude: ['low', 'medium', 'high', 'xhigh', 'max'],
+  codex: ['low', 'medium', 'high', 'xhigh'],
+  opencode: ['none', 'low', 'medium', 'high', 'xhigh', 'max'],
+};
+
+export const toProviderEffortOptions = (
+  values: readonly string[],
+): NonNullable<ProviderModelOption['effort']>['values'] => values.map((value) => ({ value }));