feat(chat): restyle transcript — left-aligned, bubbleless assistant, tool cards

All messages flow left in one column via the DaisyUI chat-start grid:
- user keeps a primary speech bubble;
- assistant/system/error render in a transparent (invisible) chat-bubble so
  they read as plain prose yet inherit identical left spacing, capped to a
  readable max-w-5xl column;
- tool call/result render as regular (non-speech) rounded cards, nested in the
  same grid so they line up too;
- role header labels dropped; chat-wide left padding added.
Alignment uses specificity-based variants (no !important).

2 files changed, 65 insertions, 39 deletions

diff --git a/src/features/chat/ui.test.ts b/src/features/chat/ui.test.ts
index ac8f640..2099257 100644
--- a/src/features/chat/ui.test.ts
+++ b/src/features/chat/ui.test.ts
@@ -20,7 +20,6 @@ describe("ChatView", () => {
 		render(ChatView, { props: { chunks } });
 
 		expect(screen.getByText("Hello world")).toBeInTheDocument();
-		expect(screen.getByText("assistant")).toBeInTheDocument();
 	});
 
 	it("renders multiple chunks", () => {
@@ -145,8 +144,10 @@ describe("ChatView", () => {
 
 		render(ChatView, { props: { chunks } });
 
-		const bubble = screen.getByText("Streaming...").closest(".chat-bubble");
-		expect(bubble).toHaveClass("opacity-50");
+		// Assistant chunks are no longer in a bubble; the provisional marker now
+		// lives on the plain wrapper that directly contains the text.
+		const wrapper = screen.getByText("Streaming...").closest("div");
+		expect(wrapper).toHaveClass("opacity-50");
 	});
 
 	it("renders empty transcript", () => {
diff --git a/src/features/chat/ui/ChatView.svelte b/src/features/chat/ui/ChatView.svelte
index cb6069b..0234852 100644
--- a/src/features/chat/ui/ChatView.svelte
+++ b/src/features/chat/ui/ChatView.svelte
@@ -4,44 +4,69 @@
 	let { chunks }: { chunks: readonly RenderedChunk[] } = $props();
 </script>
 
-<div class="flex flex-col gap-2 p-4" role="log" aria-live="polite">
+<div class="flex flex-col gap-2 p-4 pl-6" role="log" aria-live="polite">
 	{#each chunks as rendered, i (rendered.seq != null ? `c${rendered.seq}` : `p${i}`)}
-		<div class="chat {rendered.role === 'user' ? 'chat-start' : 'chat-end'}">
-			<div class="chat-header text-xs opacity-70">{rendered.role}</div>
-			<div
-				class="chat-bubble"
-				class:chat-bubble-primary={rendered.role === "user"}
-				class:chat-bubble-secondary={rendered.role === "assistant"}
-				class:opacity-50={rendered.provisional}
-			>
-				{#if rendered.chunk.type === "text"}
-					<p>{rendered.chunk.text}</p>
-				{:else if rendered.chunk.type === "thinking"}
-					<details>
-						<summary>Thinking</summary>
+		{#if rendered.role === "user"}
+			<!-- User: a speech bubble, left-aligned -->
+			<div class="chat chat-start">
+				<div class="chat-bubble chat-bubble-primary" class:opacity-50={rendered.provisional}>
+					{#if rendered.chunk.type === "text"}
 						<p>{rendered.chunk.text}</p>
-					</details>
-				{:else if rendered.chunk.type === "tool-call"}
-					<div class="text-sm">
-						<strong>{rendered.chunk.toolName}</strong>
-						<pre class="text-xs mt-1">{JSON.stringify(rendered.chunk.input, null, 2)}</pre>
-					</div>
-				{:else if rendered.chunk.type === "tool-result"}
-					<div class="text-sm" class:text-error={rendered.chunk.isError}>
-						<strong>{rendered.chunk.toolName}</strong>
-						<pre class="text-xs mt-1">{rendered.chunk.content}</pre>
-					</div>
-				{:else if rendered.chunk.type === "error"}
-					<div class="text-error" role="alert">
-						{rendered.chunk.message}
-						{#if rendered.chunk.code}
-							<span class="text-xs opacity-70">[{rendered.chunk.code}]</span>
-						{/if}
-					</div>
-				{:else if rendered.chunk.type === "system"}
-					<div class="text-sm opacity-70">{rendered.chunk.text}</div>
-				{/if}
+					{/if}
+				</div>
 			</div>
-		</div>
+		{:else if rendered.chunk.type === "tool-call" || rendered.chunk.type === "tool-result"}
+			<!-- Tool: a regular (non-speech) card. Nested in the chat-start grid via
+			     a transparent, padding-stripped chat-bubble shim so the card inherits
+			     the same left offset as the bubble bodies (no magic margin). -->
+			<div class="chat chat-start [&>.chat-bubble]:max-w-full [&>.chat-bubble]:p-0">
+				<div class="chat-bubble bg-transparent" class:opacity-50={rendered.provisional}>
+					{#if rendered.chunk.type === "tool-call"}
+						<div class="w-fit max-w-full rounded-box bg-base-200 p-3 text-sm">
+							<strong>{rendered.chunk.toolName}</strong>
+							<pre class="text-xs mt-1">{JSON.stringify(rendered.chunk.input, null, 2)}</pre>
+						</div>
+					{:else}
+						<div
+							class="w-fit max-w-full rounded-box bg-base-200 p-3 text-sm"
+							class:text-error={rendered.chunk.isError}
+						>
+							<strong>{rendered.chunk.toolName}</strong>
+							<pre class="text-xs mt-1">{rendered.chunk.content}</pre>
+						</div>
+					{/if}
+				</div>
+			</div>
+		{:else}
+			<!-- Assistant / system / error: an INVISIBLE speech bubble — the same
+			     DaisyUI chat-start grid as the user bubble, so it inherits the
+			     identical left spacing (incl. the small leading gap). Transparent
+			     bg means no visible body and no visible tail; full width capped to
+			     a readable column. -->
+			<div class="chat chat-start [&>.chat-bubble]:max-w-5xl">
+				<div
+					class="chat-bubble w-full bg-transparent"
+					class:opacity-50={rendered.provisional}
+				>
+					{#if rendered.chunk.type === "text"}
+						<p>{rendered.chunk.text}</p>
+					{:else if rendered.chunk.type === "thinking"}
+						<details>
+							<summary>Thinking</summary>
+							<p>{rendered.chunk.text}</p>
+						</details>
+					{:else if rendered.chunk.type === "error"}
+						<div class="text-error" role="alert">
+							{rendered.chunk.message}
+							{#if rendered.chunk.code}
+								<span class="text-xs opacity-70">[{rendered.chunk.code}]</span>
+							{/if}
+						</div>
+					{:else if rendered.chunk.type === "system"}
+						<div class="text-sm opacity-70">{rendered.chunk.text}</div>
+					{/if}
+				</div>
+			</div>
+		{/if}
 	{/each}
 </div>