diff --git a/apps/app/src/components-v2/layout/SidebarHeader.vue b/apps/app/src/components-v2/layout/SidebarHeader.vue
index df6a0420..e4662f35 100644
--- a/apps/app/src/components-v2/layout/SidebarHeader.vue
+++ b/apps/app/src/components-v2/layout/SidebarHeader.vue
@@ -12,21 +12,39 @@
  *   - Desktop (>=lg): toggle the persistent sidebar between expanded/collapsed
  *     → call toggleSidebar().
  *
- * Plan 2.5 P6-followup-styling: the collapse-toggle is decoupled from the
- * brand group so the logo stays centered in the collapsed rail.
- *  - Expanded: justify-between row — [brand group] [collapse chevron].
- *  - Collapsed: justify-center row — [logo only], with the expand chevron
- *    as a small floating circle absolute-positioned at the rail's right
- *    edge (tucked over the logo's right side with a solid background
- *    so the visual reads as an intentional chip, not an overlap). The
- *    aside's `overflow-hidden` (intentional, for the width transition)
- *    prevents true overhang past the rail edge — the tucked pattern is
- *    the visual compromise that keeps the affordance discoverable.
+ * Plan 2.5 P6-styling-fix: the brand logo must NOT move horizontally on
+ * collapse. Prior versions toggled `justify-between` ⇄ `justify-center`
+ * which re-centred the logo against the parent's width — and the parent
+ * width animates over 200ms, so the logo slid from x≈112px (centred in
+ * the 256px-wide expanded rail) to x=16px (centred in the 64px-wide
+ * collapsed rail). Visible jump.
  *
- * The logo square shares its size + radius with WorkspaceSwitcher's
- * avatar square (h-8 w-8 rounded-xl) so the collapsed rail reads as
- * symmetric: brand-square at top, workspace-square at bottom, bracketing
- * the nav icons.
+ * Fix: the header row is ALWAYS left-aligned with constant `px-4`
+ * (16px) horizontal padding. The logo sits flush against the left
+ * padding in both states. The "centering equation" is what makes the
+ * collapsed rail still look centred:
+ *
+ *     rail_collapsed (64px) = logo (32px) + 2 × px-4 (2 × 16px)
+ *
+ * With those numbers aligned, a stationary left-aligned logo IS
+ * visually centred in the collapsed rail. The width animation then
+ * "slides the rail closed around" the anchored logo — exactly what
+ * we want. Wordmark + Beta badge sit to the RIGHT of the logo and
+ * disappear via v-if on collapse; their absence doesn't shift the
+ * logo because they were never to its left.
+ *
+ * Toggle chevron placement also changes shape based on state:
+ *   - Expanded: collapse chevron (◀) sits inline on the right of the
+ *     brand row, pushed there by `ms-auto`. With wordmark + badge
+ *     present, this is the rightmost element in the row.
+ *   - Collapsed: a SECOND row below the brand row holds a centred
+ *     expand chevron (▶) button. This avoids the previous tucked-chip
+ *     overlap and respects the aside's `overflow-hidden`. The second
+ *     row only renders when collapsed.
+ *
+ * The logo + workspace avatar (WorkspaceSwitcher) share size + radius
+ * (h-8 w-8 rounded-lg) so the collapsed rail reads as symmetric:
+ * brand square at the top, workspace square at the bottom.
  *
  * <style scoped> covers the inset box-shadow on .mark only (no Tailwind
  * utility at this granularity, per RFC §7.4 last-resort).
@@ -55,20 +73,20 @@ function handleCollapseClick(): void {
 </script>
 
 <template>
-  <div
-    class="flex items-center h-[56px] border-b border-[var(--p-content-border-color)] flex-shrink-0 relative transition-[padding,justify-content] duration-200"
-    :class="shell.sidebarCollapsed ? 'justify-center px-0' : 'justify-between px-4'"
-  >
+  <div class="flex flex-col flex-shrink-0">
     <!--
-      Expanded: brand group on the left (logo + wordmark + Beta pill).
-      Collapsed: only the logo square, centered in the rail.
+      Brand row — ALWAYS px-4, ALWAYS left-aligned. The logo's left
+      offset (16px from rail) is identical in both expanded and
+      collapsed states (centering equation: 64px rail = 32px logo +
+      2 × 16px padding). No justify-content switching.
     -->
-    <div class="flex items-center gap-[10px]">
-      <!-- Brand square — shared treatment with WorkspaceSwitcher avatar (h-8 w-8 rounded-xl). -->
-      <span class="brand-mark mark w-8 h-8 flex-shrink-0 rounded-xl bg-gradient-to-br from-primary-500 to-primary-700 inline-flex items-center justify-center text-white font-bold text-sm">
+    <div class="flex items-center gap-[10px] h-[56px] px-4 border-b border-[var(--p-content-border-color)]">
+      <!-- Brand square — shared treatment with WorkspaceSwitcher avatar (h-8 w-8 rounded-lg). -->
+      <span class="brand-mark mark w-8 h-8 flex-shrink-0 rounded-lg bg-gradient-to-br from-primary-500 to-primary-700 inline-flex items-center justify-center text-white font-bold text-sm">
         C
       </span>
 
+      <!-- Wordmark + Beta pill: to the RIGHT of the logo; absent when collapsed (don't affect logo's left position). -->
       <span
         v-if="!shell.sidebarCollapsed"
         class="brand-name font-bold text-base tracking-[-0.01em] whitespace-nowrap text-[var(--p-text-color)]"
@@ -82,41 +100,47 @@ function handleCollapseClick(): void {
       >
         Beta
       </span>
+
+      <!--
+        Expanded-only collapse chevron — pushed to the right via ms-auto.
+        Sits to the RIGHT of the wordmark + badge, so its presence/absence
+        also doesn't affect the logo's left position.
+      -->
+      <button
+        v-if="!shell.sidebarCollapsed"
+        class="ms-auto w-7 h-7 border-0 bg-transparent text-[var(--p-text-muted-color)] rounded-[var(--p-border-radius)] inline-flex items-center justify-center transition-[background,color] duration-150 hover:bg-[var(--p-content-hover-background)] hover:text-[var(--p-text-color)] cursor-pointer"
+        aria-label="Collapse sidebar"
+        type="button"
+        @click="handleCollapseClick"
+      >
+        <Icon
+          name="tabler-chevron-left"
+          :size="16"
+        />
+      </button>
     </div>
 
-    <!-- Expanded: inline collapse chevron on the right (justify-between sibling). -->
-    <button
-      v-if="!shell.sidebarCollapsed"
-      class="w-7 h-7 border-0 bg-transparent text-[var(--p-text-muted-color)] rounded-[var(--p-border-radius)] inline-flex items-center justify-center transition-[background,color] duration-150 hover:bg-[var(--p-content-hover-background)] hover:text-[var(--p-text-color)] cursor-pointer"
-      aria-label="Collapse sidebar"
-      type="button"
-      @click="handleCollapseClick"
-    >
-      <Icon
-        name="tabler-chevron-left"
-        :size="16"
-      />
-    </button>
-
     <!--
-      Collapsed: expand chevron as a small floating chip at the rail's
-      right edge. Solid background + border so the slight overlap with
-      the centered logo reads as a tucked-in affordance rather than a
-      collision. Decoupled from the brand group so toggling does NOT
-      shift the logo's centering.
+      Collapsed-only expand row — centred chevron button in its own row
+      directly below the brand row, before the nav starts. No overlap
+      with the logo, no overhang past the aside's `overflow-hidden`.
     -->
-    <button
-      v-else
-      class="absolute end-0 top-1/2 -translate-y-1/2 w-6 h-6 rounded-full border border-[var(--p-content-border-color)] bg-[var(--p-content-background)] text-[var(--p-text-muted-color)] inline-flex items-center justify-center transition-[background,color] duration-150 hover:bg-[var(--p-content-hover-background)] hover:text-[var(--p-text-color)] cursor-pointer shadow-sm"
-      aria-label="Expand sidebar"
-      type="button"
-      @click="handleCollapseClick"
+    <div
+      v-if="shell.sidebarCollapsed"
+      class="flex justify-center py-2 border-b border-[var(--p-content-border-color)]"
     >
-      <Icon
-        name="tabler-chevron-right"
-        :size="12"
-      />
-    </button>
+      <button
+        class="w-8 h-8 border-0 bg-transparent text-[var(--p-text-muted-color)] rounded-[var(--p-border-radius)] inline-flex items-center justify-center transition-[background,color] duration-150 hover:bg-[var(--p-content-hover-background)] hover:text-[var(--p-text-color)] cursor-pointer"
+        aria-label="Expand sidebar"
+        type="button"
+        @click="handleCollapseClick"
+      >
+        <Icon
+          name="tabler-chevron-right"
+          :size="16"
+        />
+      </button>
+    </div>
   </div>
 </template>
 
diff --git a/apps/app/src/components-v2/layout/WorkspaceSwitcher.vue b/apps/app/src/components-v2/layout/WorkspaceSwitcher.vue
index e6fc62f7..63f4be66 100644
--- a/apps/app/src/components-v2/layout/WorkspaceSwitcher.vue
+++ b/apps/app/src/components-v2/layout/WorkspaceSwitcher.vue
@@ -134,28 +134,31 @@ function inviteUser(): void {
 </script>
 
 <template>
-  <div class="relative flex-shrink-0 border-t border-[var(--p-content-border-color)] p-[10px]">
+  <div class="relative flex-shrink-0 border-t border-[var(--p-content-border-color)] p-2">
     <!--
       Trigger button.
-      Plan 2.5 P6-followup-styling: rounded-xl (matches the brand square
-      in SidebarHeader), p-2 padding, hover background — replaces the
-      sharper rounded-[var(--p-border-radius)] / px-[10px] py-[8px] state.
-      Collapsed variant centres the avatar only, hiding the name and
-      chevron, so the collapsed rail reads as a vertical mirror: brand
-      square at the top, avatar square at the bottom.
+      Plan 2.5 P6-styling-fix: avatar stays anchored on collapse — the
+      `justify-center` switch is gone (it caused the same flex-recentre
+      slide as the SidebarHeader logo did). The trigger is ALWAYS
+      left-aligned; the name + chevron sit to the RIGHT of the avatar
+      and disappear via v-if on collapse without shifting the avatar.
+      Combined with the WorkspaceSwitcher wrapper's `p-2` (was
+      `p-[10px]`) the avatar's left offset is 8px (wrapper) + 8px
+      (trigger) = 16px — identical to SidebarHeader's `px-4` logo
+      offset, so the brand square and the workspace avatar are
+      vertically aligned in the collapsed rail.
+      Radius is `rounded-lg` (8px) — matches the brand mark; crisper
+      than the prior `rounded-xl` per design review.
     -->
     <button
-      class="trigger flex w-full items-center gap-[10px] rounded-xl border border-transparent bg-transparent p-2 text-[var(--p-text-color)] transition-colors duration-150 hover:bg-[var(--p-content-hover-background)]"
-      :class="[
-        collapsed ? 'justify-center' : '',
-      ]"
+      class="trigger flex w-full items-center gap-[10px] rounded-lg border border-transparent bg-transparent p-2 text-[var(--p-text-color)] transition-colors duration-150 hover:bg-[var(--p-content-hover-background)]"
       aria-haspopup="true"
       @click="toggle"
     >
-      <!-- Avatar square — shared treatment with SidebarHeader logo (h-8 w-8 rounded-xl). Gradient background is bespoke per organisation (dynamic hex pair, RFC §7.4 inline-style). -->
+      <!-- Avatar square — shared treatment with SidebarHeader logo (h-8 w-8 rounded-lg). Gradient background is bespoke per organisation (dynamic hex pair, RFC §7.4 inline-style). -->
       <span
         v-if="current"
-        class="ws-logo ws-logo-square w-8 h-8 flex-shrink-0 rounded-xl inline-flex items-center justify-center text-white font-bold text-[12px]"
+        class="ws-logo ws-logo-square w-8 h-8 flex-shrink-0 rounded-lg inline-flex items-center justify-center text-white font-bold text-[12px]"
         :style="{ background: `linear-gradient(135deg, ${current.gradient[0]}, ${current.gradient[1]})` }"
       >
         {{ current.initials }}
diff --git a/apps/app/src/components-v2/layout/__tests__/SidebarHeader.spec.ts b/apps/app/src/components-v2/layout/__tests__/SidebarHeader.spec.ts
index d9612e67..ab5d56a5 100644
--- a/apps/app/src/components-v2/layout/__tests__/SidebarHeader.spec.ts
+++ b/apps/app/src/components-v2/layout/__tests__/SidebarHeader.spec.ts
@@ -194,12 +194,13 @@ describe('SidebarHeader', () => {
     expect(btn.attributes('aria-label')).toBe('Collapse sidebar')
   })
 
-  // P6-followup-styling: when collapsed, the brand-name (wordmark) is
-  // hidden and the row centres the logo. The expand button is a
-  // separate absolute-positioned sibling — its presence must not push
-  // the logo off-centre. This spec locks the "logo stays centred"
-  // contract by asserting the row's flex alignment + wordmark absence.
-  it('collapsed: hides the Crewli wordmark and centres the row', async () => {
+  // P6-styling-fix — the brand row is ALWAYS left-aligned with constant
+  // px-4 padding (no justify-content switch on collapse). The logo's
+  // horizontal position is therefore identical in expanded vs collapsed
+  // states: 16px from the rail's left edge, which IS the visual centre
+  // when the rail narrows to w-16 (64px = 32px logo + 2 × 16px padding).
+  // This is what eliminates the previous slide-from-x=112 jump.
+  it('collapsed: hides the Crewli wordmark, brand row keeps constant px-4 alignment', async () => {
     const wrapper = mountHeader()
     const shell = useShellUiStore()
 
@@ -210,9 +211,36 @@ describe('SidebarHeader', () => {
     expect(wrapper.find('.brand-name').exists()).toBe(false)
     expect(wrapper.text()).not.toContain('Crewli')
 
-    // The header row toggles to justify-center when collapsed.
-    const row = wrapper.find('div')
+    // No justify-center / justify-between toggling — those classes
+    // caused the prior collapse-time slide. The brand row should NOT
+    // carry either when collapsed.
+    const brandRow = wrapper.find('.brand-mark').element.parentElement
 
-    expect(row.classes()).toContain('justify-center')
+    expect(brandRow?.classList.contains('justify-center')).toBe(false)
+    expect(brandRow?.classList.contains('justify-between')).toBe(false)
+    expect(brandRow?.classList.contains('px-4')).toBe(true)
+  })
+
+  it('collapsed: expand chevron is rendered in a row below the brand row (no overlap)', async () => {
+    const wrapper = mountHeader()
+    const shell = useShellUiStore()
+
+    shell.sidebarCollapsed = true
+
+    await wrapper.vm.$nextTick()
+
+    // Two buttons would mean both expand AND collapse chevrons render;
+    // we want exactly one — the expand chevron, in its own row.
+    const buttons = wrapper.findAll('button[aria-label]')
+
+    expect(buttons).toHaveLength(1)
+    expect(buttons[0].attributes('aria-label')).toBe('Expand sidebar')
+
+    // The expand button is NOT a child of the brand row — it lives in a
+    // sibling row below, so the brand row's logo cannot overlap it.
+    const expandBtn = buttons[0].element
+    const brandMark = wrapper.find('.brand-mark').element
+
+    expect(expandBtn.parentElement).not.toBe(brandMark.parentElement)
   })
 })
diff --git a/apps/app/src/components-v2/layout/__tests__/WorkspaceSwitcher.spec.ts b/apps/app/src/components-v2/layout/__tests__/WorkspaceSwitcher.spec.ts
index b42d70c9..10b45057 100644
--- a/apps/app/src/components-v2/layout/__tests__/WorkspaceSwitcher.spec.ts
+++ b/apps/app/src/components-v2/layout/__tests__/WorkspaceSwitcher.spec.ts
@@ -91,10 +91,20 @@ describe('WorkspaceSwitcher', () => {
   // P6-followup-styling — trigger uses rounded-xl + collapsed = avatar only
   // -------------------------------------------------------------------------
 
-  it('trigger uses rounded-xl (not the sharper PrimeVue var-radius)', () => {
+  it('trigger uses rounded-lg (matches the brand square in SidebarHeader)', () => {
     const wrapper = mountSwitcher()
 
-    expect(wrapper.find('.trigger').classes()).toContain('rounded-xl')
+    expect(wrapper.find('.trigger').classes()).toContain('rounded-lg')
+  })
+
+  it('trigger has no justify-center class in either state (avatar stays anchored on collapse)', () => {
+    const expanded = mountSwitcher({ collapsed: false })
+
+    expect(expanded.find('.trigger').classes()).not.toContain('justify-center')
+
+    const collapsed = mountSwitcher({ collapsed: true })
+
+    expect(collapsed.find('.trigger').classes()).not.toContain('justify-center')
   })
 
   it('collapsed trigger renders avatar only, hides name + chevron', () => {