feat(chat): reasoning-effort selector — sticky per-conversation thinking-depth knob

Consume the backend's reasoning-effort handoff ([email protected] ReasoningEffort +
[email protected] GET/PUT /conversations/:id/reasoning-effort,
ChatRequest.reasoningEffort): a 5-level selector in the sidebar Model view,
under the provider + model dropdowns. null renders as 'high (default)' per
the server-owned resolution chain; PUT on change (effective next turn);
error + revert on 400; per-conversation re-mount incl. drafts (the draft id
survives promotion, so an effort set on a draft applies from turn 1).
Re-mirrored .dispatch references; GLOSSARY 'reasoning effort'; handoff
updated. 616 tests green; live curl probe passed.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/features/chat/index.ts b/src/features/chat/index.ts
index 139a64f..9b94392 100644
--- a/src/features/chat/index.ts
+++ b/src/features/chat/index.ts
@@ -2,11 +2,24 @@ export type { RenderedChunk, RenderGroup, ToolBatchEntry } from "../../core/chun
 export { groupRenderedChunks } from "../../core/chunks";
 export type { TurnMetricsEntry } from "../../core/metrics";
 export type { ChatTransport, HistorySync, HistoryWindow, MetricsSync } from "./ports";
+export type {
+	EffortOption,
+	ReasoningEffortSaveResult,
+	SaveReasoningEffort,
+} from "./reasoning-effort";
+export {
+	DEFAULT_REASONING_EFFORT,
+	effectiveEffort,
+	effortOptions,
+	isReasoningEffort,
+	REASONING_EFFORT_LEVELS,
+} from "./reasoning-effort";
 export type { ChatStore, ChatStoreDependencies } from "./store.svelte";
 export { createChatStore } from "./store.svelte";
 export { default as ChatView } from "./ui/ChatView.svelte";
 export { default as Composer } from "./ui/Composer.svelte";
 export { default as ModelSelector } from "./ui/ModelSelector.svelte";
+export { default as ReasoningEffortSelector } from "./ui/ReasoningEffortSelector.svelte";
 
 /** Public module manifest — aggregated by the shell's "Loaded Modules" view. */
 export const manifest = {