feat(chat): restyle thinking — visible bubble, collapse, title swap, persisted open

Thinking renders inside a visible rounded-card bubble (like tool calls),
capped to the same max-w-5xl column as assistant text. Uses a DaisyUI
checkbox collapse (no arrow/plus icon) with smooth animation. Title reads
"Thinking" + loading-dots while the model is actively generating, then
flips to "Thoughts" with no dots once done. Open/closed state persists
across the generating→completed→sealed transition via stable ordinal keys
(per-conversation isolation via {#key} in App). Added optional streaming
flag to RenderedChunk (pure selector, only on the accumulating chunk).

1 files changed, 1 insertions, 1 deletions

diff --git a/src/core/chunks/selectors.ts b/src/core/chunks/selectors.ts
index 8fb832f..839ba65 100644
--- a/src/core/chunks/selectors.ts
+++ b/src/core/chunks/selectors.ts
@@ -18,7 +18,7 @@ export function selectChunks(state: TranscriptState): readonly RenderedChunk[] {
 			state.accumulating.kind === "text"
 				? { type: "text", text: state.accumulating.text }
 				: { type: "thinking", text: state.accumulating.text };
-		result.push({ seq: null, role: "assistant", chunk, provisional: true });
+		result.push({ seq: null, role: "assistant", chunk, provisional: true, streaming: true });
 	}
 	return result;
 }