From ff040fa1b51e08aea3b39da839d074ef828ea76c Mon Sep 17 00:00:00 2001
From: Jesse_Chen <chen.yue@mevixaga.com>
Date: Sat, 18 Jul 2026 21:42:04 +0800
Subject: [PATCH] docs: plan chat header sidebar trigger

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+# Chat Header Sidebar Trigger Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Make the production chat session title left-aligned and render the existing sidebar toggle as a visible, accessible control.
+
+**Architecture:** Keep sidebar state in the existing provider and make the shared `SidebarTrigger` responsible for its stable `PanelLeft` glyph. Lay out the chat header as a three-column grid so the trigger, flexible title column, and credit control have deterministic positions at every breakpoint.
+
+**Tech Stack:** Next.js 16, React 19, TypeScript, Lucide React, CSS, Node test runner.
+
+## Global Constraints
+
+- Keep exactly one visible sidebar trigger beside the active session title.
+- Keep the trigger target at least 44px and preserve localized `aria-label` and `aria-expanded` state.
+- Preserve Command/Control+B, desktop/tablet widths, mobile drawer behavior, session data, requests, and account behavior.
+- Keep long and CJK titles inside the flexible column with ellipsis and no credit-control displacement.
+- Keep sidebar state changes immediate and the glyph stable.
+- Do not modify unrelated dependency or lockfile content.
+
+---
+
+### Task 1: Visible Shared Sidebar Trigger
+
+**Files:**
+- Modify: `frontend/tests/sidebar-contract.test.ts`
+- Modify: `frontend/src/components/ui/sidebar.tsx`
+- Modify: `frontend/src/components/app-sidebar.tsx`
+
+**Interfaces:**
+- Consumes: `SidebarProviderContextValue`, `SidebarTriggerProps`, and the existing `toggleSidebar()` action.
+- Produces: `SidebarTrigger`, a 44px button with a stable `PanelLeft` child, localized accessible state, and composed click behavior.
+
+- [ ] **Step 1: Write failing trigger and composition assertions**
+
+Add these assertions to `frontend/tests/sidebar-contract.test.ts`:
+
+```ts
+assert.match(sidebar, /PanelLeft/);
+assert.doesNotMatch(sidebar, /PanelLeftClose|PanelLeftOpen/);
+assert.match(sidebar, /<PanelLeft aria-hidden="true" \/>/);
+assert.doesNotMatch(appSidebar, /SidebarTrigger/);
+assert.match(sidebar, /sidebarSurfaceRef\.current\?\.focus\(\)/);
+```
+
+- [ ] **Step 2: Run the focused contract test and confirm failure**
+
+Run:
+
+```bash
+node --test tests/sidebar-contract.test.ts
+```
+
+Expected: FAIL because `SidebarTrigger` has no `PanelLeft` child, the brand row still renders a duplicate trigger, and mobile focus still targets the removed sidebar trigger.
+
+- [ ] **Step 3: Implement the shared trigger and stable mobile focus target**
+
+In `frontend/src/components/ui/sidebar.tsx`, import and render the icon:
+
+```tsx
+import { PanelLeft } from "lucide-react";
+
+return (
+  <button
+    ref={register}
+    type="button"
+    data-sidebar="trigger"
+    data-slot="sidebar-trigger"
+    aria-label={label}
+    aria-expanded={expanded}
+    className={cn("min-h-11 min-w-11", className)}
+    onClick={(event) => {
+      onClick?.(event);
+      if (!event.defaultPrevented) toggleSidebar();
+    }}
+    {...props}
+  >
+    <PanelLeft aria-hidden="true" />
+  </button>
+);
+```
+
+Replace the duplicate sidebar-trigger ref with a drawer-surface ref, register it on the `aside`, and focus it when the mobile drawer opens:
+
+```tsx
+readonly setSidebarSurface: (element: HTMLElement | null) => void;
+const sidebarSurfaceRef = useRef<HTMLElement | null>(null);
+const focusDrawer = window.requestAnimationFrame(() => sidebarSurfaceRef.current?.focus());
+```
+
+Remove `SidebarTrigger` from the imports and brand row in `frontend/src/components/app-sidebar.tsx`.
+
+- [ ] **Step 4: Run the focused contract test**
+
+Run:
+
+```bash
+node --test tests/sidebar-contract.test.ts
+```
+
+Expected: PASS with every sidebar contract test green.
+
+- [ ] **Step 5: Commit the trigger behavior**
+
+```bash
+git add frontend/tests/sidebar-contract.test.ts frontend/src/components/ui/sidebar.tsx frontend/src/components/app-sidebar.tsx
+git commit -m "fix: show chat sidebar trigger"
+```
+
+### Task 2: Left-Aligned Header Layout and Design Contract
+
+**Files:**
+- Modify: `frontend/tests/sidebar-contract.test.ts`
+- Modify: `frontend/src/app/globals.css`
+- Modify: `frontend/DESIGN.md`
+
+**Interfaces:**
+- Consumes: the existing DOM order `SidebarTrigger`, title/status `div`, and `.credit-button` in `frontend/src/app/page.tsx`.
+- Produces: `.chat-header` with `grid-template-columns: auto minmax(0, 1fr) auto` and an explicitly left-aligned flexible title column.
+
+- [ ] **Step 1: Write the failing header layout assertion**
+
+Add this test to `frontend/tests/sidebar-contract.test.ts`:
+
+```ts
+test("keeps the chat title in the flexible left-aligned header column", () => {
+  assert.match(cssBlock(".chat-header"), /grid-template-columns:\s*auto\s+minmax\(0,\s*1fr\)\s+auto/);
+  assert.match(cssBlock(".chat-header"), /text-align:\s*left/);
+  assert.doesNotMatch(cssBlock(".chat-header"), /justify-content:\s*space-between/);
+});
+```
+
+Also assert that the trigger SVG is 18px and the sidebar design contract names the single trigger placement and immediate state changes.
+
+- [ ] **Step 2: Run the focused test and confirm failure**
+
+Run:
+
+```bash
+node --test tests/sidebar-contract.test.ts
+```
+
+Expected: FAIL because `.chat-header` still uses flex/space-between and the design contract does not name the placement.
+
+- [ ] **Step 3: Implement deterministic header geometry**
+
+Update `frontend/src/app/globals.css`:
+
+```css
+[data-sidebar="trigger"] {
+  width: 44px;
+  height: 44px;
+  display: grid;
+  flex: 0 0 auto;
+  place-items: center;
+  padding: 0;
+  border: 0;
+  border-radius: 50%;
+  background: transparent;
+  color: var(--sidebar-foreground);
+  cursor: pointer;
+}
+
+[data-sidebar="trigger"] svg { width: 18px; height: 18px; }
+
+.chat-header {
+  display: grid;
+  grid-template-columns: auto minmax(0, 1fr) auto;
+  align-items: center;
+  text-align: left;
+}
+
+.chat-header > div { min-width: 0; }
+```
+
+Remove the duplicate brand-row trigger rules. Keep the existing mobile gap and padding while preserving the three grid columns.
+
+Update `frontend/DESIGN.md` so `Sidebar shell` declares the single header trigger and immediate state changes.
+
+- [ ] **Step 4: Run focused tests and verify the CSS contract**
+
+Run:
+
+```bash
+node --test tests/sidebar-contract.test.ts
+```
+
+Expected: PASS with the icon, placement, focus, header-grid, mobile, and accessibility assertions green.
+
+- [ ] **Step 5: Commit layout and design contract**
+
+```bash
+git add frontend/tests/sidebar-contract.test.ts frontend/src/app/globals.css frontend/DESIGN.md
+git commit -m "fix: left align chat session title"
+```
+
+### Task 3: Verification and Production Deployment
+
+**Files:**
+- Verify: `frontend/src/components/ui/sidebar.tsx`
+- Verify: `frontend/src/components/app-sidebar.tsx`
+- Verify: `frontend/src/app/globals.css`
+- Verify: `frontend/tests/sidebar-contract.test.ts`
+- Verify: `frontend/DESIGN.md`
+
+**Interfaces:**
+- Consumes: the current branch commits from Tasks 1 and 2.
+- Produces: a tested fast-forward of `origin/main` and a production build serving the corrected header.
+
+- [ ] **Step 1: Run complete frontend verification**
+
+Run:
+
+```bash
+node --test tests/*.test.ts
+npx eslint .
+npx next build
+```
+
+Expected: all tests pass, ESLint exits 0, and the Next.js production build completes.
+
+- [ ] **Step 2: Capture real-browser visual evidence**
+
+At desktop and mobile viewports, verify:
+
+```text
+desktop: trigger visible -> title left aligned -> credits fixed right -> collapse and expand both work
+mobile: trigger visible -> drawer opens -> scrim and Escape close -> focus remains visible
+long title: ellipsis remains inside the middle column without displacing credits
+```
+
+Expected: screenshots show no missing icon, centered title, CJK wrapping defect, or clipped control.
+
+- [ ] **Step 3: Run independent visual QA**
+
+Dispatch the required read-only design-system and visual-fidelity reviews against fresh desktop and mobile captures.
+
+Expected: both return PASS with no blocking product or evidence findings.
+
+- [ ] **Step 4: Push the verified branch as a fast-forward to production main**
+
+```bash
+git fetch origin
+git merge-base --is-ancestor origin/main HEAD
+git push origin HEAD:main
+```
+
+Expected: the push is a fast-forward and the repository's automatic production workflow starts.
+
+- [ ] **Step 5: Verify production health and rendered source**
+
+Run the documented production checks:
+
+```bash
+curl -fsS https://jyotisha.chat/login
+curl -fsS -o /dev/null -w '%{http_code}\n' https://jyotisha.chat/api/account
+```
+
+Then verify the internal API health from the web container and inspect the deployed header CSS and trigger component.
+
+Expected: login is 200, logged-out account is 401, internal API health is 200 with `swisseph_available=true`, production CSS uses the three-column grid, and the trigger source contains `PanelLeft`.