unified agent indicator at end of conversation

- New AgentIndicator component: replaces 3 separate indicators
  (loading dots, ToolCallGroup summary, activity bar) with one
- Positioned as last item in message list — scrolls naturally
- Shows current tool action: 'Researching lxc:nfs-export…' etc
- Spinner during work, check on completion, X on error
- Fades out 3s after turn completes
- Activity bar, loading dots, statusLabel removed from Chat
- Continue button moved to sidebar session panel

plans/2026-07-14-unified-agent-indicator.md

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+# 2026-07-14 — Unified agent activity indicator
+
+**Status:** Planned
+
+## Current state — three separate indicators
+
+| Component | Location | Shows |
+|---|---|---|
+| Loading dots (Chat.svelte:146) | Inline in assistant bubble | 3 bouncing dots when no text/tools yet |
+| ToolCallGroup trigger row | Inline in assistant bubble | "12 tools" with spinner |
+| Activity bar | Bottom of message list | "Agent is responding…" / "Working" / Continue button |
+
+All three overlap. The operator sees dots → then a tool count → then the activity bar — three different visual styles for the same thing: "the agent is working."
+
+## Target: single indicator appended to conversation
+
+One row, always the last item in the message list, that replaces the loading dots, ToolCallGroup summary, and activity bar. Think of it like a system message appended at the end of the conversation.
+
+### Behavior
+
+```
+User: "audit fleet"
+Assistant: "I'll check all hosts. Here's the plan..."  ← full message bubble
+
+┌─ Agent is auditing… ───────────────────┐
+│ ◉ apt update on lxc:jellyfin          │  ← spinner + current action
+└────────────────────────────────────────┘
+
+... agent finishes ...
+
+Assistant: "Done. 19 LXCs have pending updates."  ← next message bubble
+```
+
+The indicator:
+- **Appears** when the agent starts working (first `tool_use` event or `streaming=true`)
+- **Updates** its description with the current tool name in flight
+- **Collapses/disappears** when the turn ends (`done` event or `streaming=false`)
+- If there were tools, shows a brief completion summary for 3 seconds then fades
+- During auto-continuation (polling picks up new messages), reappears if the agent did tool calls
+
+### States
+
+| State | Icon | Description |
+|---|---|---|
+| Thinking | ◉ pulse | "Agent is thinking…" |
+| Planning | ◉ pulse | "Building plan…" |
+| Researching | ◉ pulse | "Researching <entity>…" |
+| Executing | ◉ spinner | "<tool_name> <target>…" |
+| Done | ✓ | Fades out after 3s |
+
+### Data source
+
+The description comes from the most recent `tool_use` event's name + args. If no tools yet, show generic "thinking" message. The derived `toolTimeline` store already has this data.
+
+## Implementation
+
+### 1. New component: `AgentIndicator.svelte`
+
+**Props:** `active: boolean`, `lastTool: ToolCallResult | null`, `toolCount: number`
+
+Renders a single compact row:
+```html
+<div class="activity-indicator">
+  <LoaderCircle class="animate-spin" /> <!-- or CheckIcon when done -->
+  <span>{label}</span>
+</div>
+```
+
+`label` is derived:
+```ts
+const label = $derived.by(() => {
+  if (!active) return ''
+  if (!lastTool) return 'Agent is thinking…'
+  const args = lastTool.args ?? {}
+  switch (lastTool.name) {
+    case 'set_goal': return 'Setting goal…'
+    case 'propose_plan': return 'Building plan…'
+    case 'search_knowledge': return `Researching: ${args.query ?? ''}`
+    case 'get_entity': return `Looking up ${args.slug_or_id ?? ''}`
+    case 'run': return `${args.purpose ?? 'Running command…'}`
+    case 'list_lxcs': return 'Listing containers…'
+    case 'update_plan_step': return 'Updating progress…'
+    case 'upsert_knowledge': return 'Recording knowledge…'
+    case 'complete_task': return 'Wrapping up…'
+    default: return `${lastTool.name}…`
+  }
+})
+```
+
+### 2. Chat.svelte changes
+
+- **Remove** activity bar from bottom of messages
+- **Replace** the 3 bouncing dots `{#if msg.tools.length === 0}` with nothing (the indicator covers this)
+- **Add** `<AgentIndicator>` after the `{#each}` loop, before `messagesEnd`
+- The indicator shows when `$streaming || liveStatus === 'executing'`
+- Pass `lastTool` from `$toolTimeline` — the last tool_use entry
+
+### 3. Remove activity bar code
+
+Delete the `{#if $currentSession && $messages.length > 0}` block at the bottom (already moved once, now deleted entirely — replaced by AgentIndicator).
+
+### 4. Remove loading dots
+
+In Chat.svelte, remove the 3 bouncing dots block:
+```svelte
+{:else if msg.tools.length === 0}
+  <div class="flex items-center gap-1.5 py-1 text-sm text-muted-foreground">
+    <span class="size-1.5 animate-bounce rounded-full bg-current ...">...</span>
+  </div>
+```
+
+## Verification
+
+- Send "status" → indicator appears "Agent is thinking…" → agent responds → indicator fades
+- Send "check updates on jellyfin" → indicator shows "Researching…" → "Listing containers…" → "Running apt list…" → fades
+- Auto-continuation fires → indicator reappears with current tool → fades when done
+- Scroll up during agent work → indicator stays at bottom of message list (it's just a message)
+- Error during agent work → indicator shows "Error: …" with X icon