sidebar reorganized: Scope, Plan, Activity — collapsible + resizable

- TaskContextPanel restructured into 3 collapsible sections:
  Scope (graph), Plan (goal + steps + progress), Activity (timeline)
- Collapsed headers show compact live status: 'Graph', 'Step X/N', 'N actions'
- Sections are vertically resizable via drag handles
- Plan section shows goal inline + step list + progress bar
- GoalHeader and PlanProgress no longer rendered separately
- ActivityTimeline header moved to TaskContextPanel

web/src/lib/components/ActivityTimeline.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-  import { activityLog, type ActivityEntry, streaming } from '$lib/stores/chat'
+  import { activityLog, type ActivityEntry } from '$lib/stores/chat'
   import LoaderCircleIcon from '@lucide/svelte/icons/loader-circle'
   import CircleCheckIcon from '@lucide/svelte/icons/circle-check'
   import CircleXIcon from '@lucide/svelte/icons/circle-x'
@@ -41,15 +41,6 @@
 </script>
 
 <div class="flex h-full flex-col">
-  <div class="flex items-center justify-between border-b px-3 py-2">
-    <span class="text-[11px] font-semibold uppercase tracking-wider text-muted-foreground">Activity</span>
-    {#if $streaming}
-      <span class="flex items-center gap-1 text-[11px] text-primary">
-        <LoaderCircleIcon class="size-3 animate-spin" />
-        live
-      </span>
-    {/if}
-  </div>
   <div class="flex-1 overflow-y-auto">
     {#if $activityLog.length === 0}
       <div class="px-3 py-6 text-center text-xs text-muted-foreground">

web/src/lib/components/TaskContextPanel.svelte

@@ -1,23 +1,185 @@
 <script lang="ts">
   import { onMount } from 'svelte'
-  import { startWorkspace } from '$lib/stores/workspace'
-  import GoalHeader from './GoalHeader.svelte'
-  import PlanProgress from './PlanProgress.svelte'
+  import { startWorkspace, planSteps, currentTask } from '$lib/stores/workspace'
+  import { activityLog, streaming } from '$lib/stores/chat'
   import OperatorQuestion from './OperatorQuestion.svelte'
   import SessionGraph from './SessionGraph.svelte'
   import ActivityTimeline from './ActivityTimeline.svelte'
+  import ChevronDownIcon from '@lucide/svelte/icons/chevron-down'
+  import ChevronRightIcon from '@lucide/svelte/icons/chevron-right'
+  import TargetIcon from '@lucide/svelte/icons/target'
+  import LoaderCircleIcon from '@lucide/svelte/icons/loader-circle'
 
   onMount(() => startWorkspace())
+
+  let scopeOpen = $state(true)
+  let planOpen = $state(true)
+  let activityOpen = $state(true)
+
+  // Resize: distribute height across the 3 content areas.
+  // Heights stored in px, minus header sizes. Default even split.
+  let heights = $state([300, 200, 200])
+  let resizing = $state(-1)
+  let resizeStartY = $state(0)
+  let resizeStartH = $state<[number, number]>([0, 0])
+
+  function onPointerDown(i: number, e: PointerEvent) {
+    e.preventDefault()
+    resizing = i
+    resizeStartY = e.clientY
+    resizeStartH = [heights[i], heights[i + 1]]
+    window.addEventListener('pointermove', onPointerMove)
+    window.addEventListener('pointerup', onPointerUp)
+  }
+
+  function onPointerMove(e: PointerEvent) {
+    if (resizing < 0) return
+    const dy = e.clientY - resizeStartY
+    const minH = 80
+    // Clamp each section to minimum
+    const newA = Math.max(minH, resizeStartH[0] + dy)
+    const newB = Math.max(minH, resizeStartH[1] - dy)
+    const newHeights = [...heights]
+    newHeights[resizing] = newA
+    newHeights[resizing + 1] = newB
+    heights = newHeights
+  }
+
+  function onPointerUp() {
+    resizing = -1
+    window.removeEventListener('pointermove', onPointerMove)
+    window.removeEventListener('pointerup', onPointerUp)
+  }
+
+  // Plan collapsed status
+  const planDone = $derived($planSteps.filter((s) => s.status === 'done').length)
+  const planTotal = $derived($planSteps.length)
+
+  // Activity collapsed status
+  const activityRunning = $derived($activityLog.filter((e) => e.status === 'running').length)
+  const activityCount = $derived($activityLog.length)
 </script>
 
 <div class="flex h-full min-h-0 flex-col">
-  <GoalHeader />
-  <PlanProgress />
   <OperatorQuestion />
-  <div class="min-h-0 flex-1">
-    <SessionGraph />
+
+  <!-- Scope -->
+  <div class="flex shrink-0 flex-col border-b">
+    <button
+      type="button"
+      class="flex items-center gap-1.5 px-3 py-2 text-left text-[11px] font-semibold uppercase tracking-wider text-muted-foreground hover:text-foreground"
+      onclick={() => (scopeOpen = !scopeOpen)}
+    >
+      {#if scopeOpen}<ChevronDownIcon class="size-3" />{:else}<ChevronRightIcon class="size-3" />{/if}
+      <span>Scope</span>
+      {#if !scopeOpen}
+        <span class="ml-auto font-normal normal-case">Graph</span>
+      {/if}
+    </button>
+    {#if scopeOpen}
+      <div style="height: {heights[0]}px">
+        <SessionGraph />
+      </div>
+      <!-- resize handle -->
+      <div
+        class="h-1.5 cursor-row-resize border-b hover:bg-primary/30 touch-none"
+        onpointerdown={(e) => onPointerDown(0, e)}
+        role="separator"
+        aria-orientation="horizontal"
+      ></div>
+    {/if}
   </div>
-  <div class="max-h-[40%] overflow-y-auto border-t">
-    <ActivityTimeline />
+
+  <!-- Plan -->
+  <div class="flex shrink-0 flex-col border-b">
+    <button
+      type="button"
+      class="flex items-center gap-1.5 px-3 py-2 text-left text-[11px] font-semibold uppercase tracking-wider text-muted-foreground hover:text-foreground"
+      onclick={() => (planOpen = !planOpen)}
+    >
+      {#if planOpen}<ChevronDownIcon class="size-3" />{:else}<ChevronRightIcon class="size-3" />{/if}
+      <span>Plan</span>
+      {#if !planOpen}
+        {#if planTotal > 0}
+          <span class="ml-auto font-normal normal-case">Step {planDone}/{planTotal}</span>
+        {:else if $currentTask?.goal}
+          <span class="ml-auto max-w-[120px] truncate font-normal normal-case">{$currentTask.goal}</span>
+        {:else}
+          <span class="ml-auto font-normal normal-case text-muted-foreground">No plan yet</span>
+        {/if}
+      {/if}
+    </button>
+    {#if planOpen}
+      <div style="height: {heights[1]}px" class="flex flex-col overflow-y-auto">
+        {#if $currentTask?.goal}
+          <div class="flex items-center gap-1.5 px-3 py-1.5 text-xs">
+            <TargetIcon class="size-3 shrink-0 text-muted-foreground" />
+            <span class="truncate text-muted-foreground">{$currentTask.goal}</span>
+          </div>
+        {/if}
+        {#if planTotal > 0}
+          <div class="flex items-center justify-between px-3 pb-1 text-[11px] text-muted-foreground">
+            <span>{planDone}/{planTotal} done</span>
+          </div>
+          <div class="mx-3 h-1 rounded-full bg-muted">
+            <div class="h-full rounded-full bg-primary transition-all duration-500" style="width: {planTotal > 0 ? Math.round((planDone / planTotal) * 100) : 0}%"></div>
+          </div>
+          <ol class="flex flex-col gap-0.5 overflow-y-auto px-3 py-1 text-[11px]">
+            {#each $planSteps as step (step.id)}
+              <li class="flex items-start gap-1.5 {step.status === 'done' ? 'text-muted-foreground line-through decoration-muted-foreground/40' : ''}">
+                <span class="mt-0.5 shrink-0">
+                  {#if step.status === 'done'}
+                    <div class="size-2 rounded-full bg-success" />
+                  {:else if step.status === 'running'}
+                    <LoaderCircleIcon class="size-2.5 animate-spin text-primary" />
+                  {:else if step.status === 'failed'}
+                    <div class="size-2 rounded-full bg-destructive" />
+                  {:else}
+                    <div class="size-2 rounded-full bg-muted-foreground/30" />
+                  {/if}
+                </span>
+                <span class="leading-tight">{step.title}</span>
+              </li>
+            {/each}
+          </ol>
+        {:else}
+          <div class="px-3 py-3 text-center text-xs text-muted-foreground">
+            No plan yet
+          </div>
+        {/if}
+      </div>
+      <!-- resize handle -->
+      <div
+        class="h-1.5 cursor-row-resize border-b hover:bg-primary/30 touch-none"
+        onpointerdown={(e) => onPointerDown(1, e)}
+        role="separator"
+        aria-orientation="horizontal"
+      ></div>
+    {/if}
+  </div>
+
+  <!-- Activity -->
+  <div class="flex min-h-0 flex-1 flex-col">
+    <button
+      type="button"
+      class="flex shrink-0 items-center gap-1.5 px-3 py-2 text-left text-[11px] font-semibold uppercase tracking-wider text-muted-foreground hover:text-foreground"
+      onclick={() => (activityOpen = !activityOpen)}
+    >
+      {#if activityOpen}<ChevronDownIcon class="size-3" />{:else}<ChevronRightIcon class="size-3" />{/if}
+      <span>Activity</span>
+      {#if !activityOpen}
+        {#if $streaming && activityRunning > 0}
+          <LoaderCircleIcon class="size-3 animate-spin text-primary" />
+          <span class="font-normal normal-case text-primary">{activityRunning} running</span>
+        {:else}
+          <span class="ml-auto font-normal normal-case">{activityCount || '—'} action{activityCount === 1 ? '' : 's'}</span>
+        {/if}
+      {/if}
+    </button>
+    {#if activityOpen}
+      <div class="min-h-0 flex-1 overflow-hidden">
+        <ActivityTimeline />
+      </div>
+    {/if}
   </div>
 </div>