Mobile Conversations toggle in header + theme-aware agent bubbles (#87, #88) (#89)

## Summary
- Closes [#87](#87) — move mobile Conversations toggle inline beside the Hesychia logo in the header (no overlay over chat bubbles)
- Closes [#88](#88) — agent message bubbles follow light/dark theme with correct text contrast; user bubbles unchanged

## Changes
- `Header2`: optional `onOpenConversations` renders compact mobile toggle next to brand; label hides on very narrow screens to avoid crowding the nav hamburger
- `AsyncDashboard2`: wire drawer open via header callback; remove floating `MobileSidebarToggle`
- `ConversationDetailCard`: light-mode agent bubble uses light background + theme text color; dark mode keeps dark translucent bubble + light text

## Test plan
- [ ] Mobile: Conversations control appears beside Hesychia logo; opens/closes drawer as before
- [ ] Mobile: chat message text no longer obscured by floating Conversations chip
- [ ] Narrow phone width: header usable with logo + toggle + hamburger (no overflow)
- [ ] Light mode: agent bubbles light with dark text; user bubbles still gradient
- [ ] Dark mode: agent bubbles dark with light text; readability OK on long replies
- [ ] Unit: `Header2` + `ConversationDetailCard` tests passReviewed-on: #89

llm-fe/src/llm-fe/components/ConversationDetailCard/ConversationDetailCard.test.tsx

@@ -4,7 +4,7 @@ import { MemoryRouter } from 'react-router-dom';
 import { ThemeProvider } from 'styled-components';
 import ConversationDetailCard from './ConversationDetailCard';
 
-const theme = {
+const darkTheme = {
   main: '#336699',
   focus: '#224466',
   darkMode: true,
@@ -15,10 +15,24 @@ const theme = {
   },
 };
 
-const renderCard = (props: {
+const lightTheme = {
+  main: '#336699',
+  focus: '#224466',
+  darkMode: false,
+  colors: {
+    text: '#111111',
+    cardBackground: 'rgba(255,255,255,0.8)',
+    cardBorder: 'rgba(0,0,0,0.1)',
+  },
+};
+
+const renderCard = (
+  props: {
     message: string;
     user_created: boolean;
-}) =>
+  },
+  theme: typeof darkTheme = darkTheme
+) =>
   render(
     <MemoryRouter>
       <ThemeProvider theme={theme as never}>
@@ -80,4 +94,26 @@ describe('ConversationDetailCard', () => {
     expect(screen.queryByRole('link', { name: /upgrade your plan/i })).not.toBeInTheDocument();
     expect(screen.getByText(/image generation/i)).toBeInTheDocument();
   });
+
+  it('uses theme text color for agent bubble in light mode (#88)', () => {
+    renderCard(
+      { message: 'Light mode reply', user_created: false },
+      lightTheme
+    );
+    const message = screen.getByText('Light mode reply');
+    const agentBubble = message.closest('div');
+    expect(agentBubble).not.toBeNull();
+    expect(getComputedStyle(agentBubble!).color).toBe('rgb(17, 17, 17)');
+  });
+
+  it('keeps light agent text in dark mode (#88)', () => {
+    renderCard(
+      { message: 'Dark mode reply', user_created: false },
+      darkTheme
+    );
+    const message = screen.getByText('Dark mode reply');
+    const agentBubble = message.closest('div');
+    expect(agentBubble).not.toBeNull();
+    expect(getComputedStyle(agentBubble!).color).toBe('rgb(255, 255, 255)');
+  });
 });

llm-fe/src/llm-fe/components/ConversationDetailCard/ConversationDetailCard.tsx

@@ -29,18 +29,32 @@ const Bubble = styled.div<{ $isUser: boolean }>`
       ? `linear-gradient(135deg, ${props.theme.main} 0%, ${props.theme.focus} 100%)`
       : props.theme.darkMode
         ? "rgba(255, 255, 255, 0.1)"
-        : "rgba(0, 0, 0, 0.7)"};
-  color: #fff;
+        : "rgba(0, 0, 0, 0.06)"};
+  color: ${(props) =>
+    props.$isUser || props.theme.darkMode ? "#fff" : props.theme.colors.text};
   backdrop-filter: blur(10px);
-  border: 1px solid ${(props) => props.theme.darkMode ? "rgba(255, 255, 255, 0.1)" : "rgba(0, 0, 0, 0.1)"};
-  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
+  border: 1px solid ${(props) =>
+    props.$isUser
+      ? props.theme.darkMode
+        ? "rgba(255, 255, 255, 0.1)"
+        : "rgba(0, 0, 0, 0.1)"
+      : props.theme.darkMode
+        ? "rgba(255, 255, 255, 0.1)"
+        : "rgba(0, 0, 0, 0.08)"};
+  box-shadow: ${(props) =>
+    props.$isUser || props.theme.darkMode
+      ? "0 4px 15px rgba(0, 0, 0, 0.2)"
+      : "0 2px 10px rgba(0, 0, 0, 0.08)"};
   font-size: 1rem;
   line-height: 1.6;
   border-bottom-right-radius: ${(props) => (props.$isUser ? "0.2rem" : "1.2rem")};
   border-bottom-left-radius: ${(props) => (props.$isUser ? "1.2rem" : "0.2rem")};
 
   & pre {
-    background: rgba(0, 0, 0, 0.3);
+    background: ${(props) =>
+      props.$isUser || props.theme.darkMode
+        ? "rgba(0, 0, 0, 0.3)"
+        : "rgba(0, 0, 0, 0.06)"};
     padding: 1rem;
     border-radius: 0.5rem;
     overflow-x: auto;
@@ -53,7 +67,8 @@ const Bubble = styled.div<{ $isUser: boolean }>`
   }
 
   & a {
-    color: #a0c4ff;
+    color: ${(props) =>
+      props.$isUser || props.theme.darkMode ? "#a0c4ff" : props.theme.main};
     text-decoration: underline;
   }
 
@@ -72,7 +87,7 @@ const Bubble = styled.div<{ $isUser: boolean }>`
 const LoadingDot = styled.div`
   width: 8px;
   height: 8px;
-  background: #fff;
+  background: currentColor;
   border-radius: 50%;
   margin: 0 4px;
   animation: bounce 1.4s infinite ease-in-out both;

llm-fe/src/llm-fe/components/Header2/Header2.test.tsx

@@ -29,7 +29,7 @@ const theme = {
   },
 };
 
-const renderHeader = () =>
+const renderHeader = (props: { onOpenConversations?: () => void } = {}) =>
   render(
     <MemoryRouter>
       <ThemeProvider theme={theme as never}>
@@ -43,7 +43,7 @@ const renderHeader = () =>
           }}
         >
           <AccountContext.Provider value={{ account: undefined, setAccount: jest.fn() }}>
-            <Header2 />
+            <Header2 {...props} />
           </AccountContext.Provider>
         </AuthContext.Provider>
       </ThemeProvider>
@@ -95,3 +95,29 @@ describe('Header2 (#81 subscription-aware Documents nav link)', () => {
     expect(await screen.findAllByText('Documents')).toHaveLength(2);
   });
 });
+
+describe('Header2 (#87 conversations toggle beside logo)', () => {
+  beforeEach(() => {
+    mockGet.mockReset();
+    mockPost.mockReset();
+    resetSubscriptionCache();
+    mockGet.mockResolvedValue(subscriptionWithRag(false));
+  });
+
+  it('does not render conversations toggle when callback is omitted', () => {
+    renderHeader();
+    expect(screen.queryByRole('button', { name: /open conversations/i })).not.toBeInTheDocument();
+  });
+
+  it('renders conversations toggle next to brand when callback is provided', () => {
+    const onOpenConversations = jest.fn();
+    renderHeader({ onOpenConversations });
+
+    // Mobile-only via CSS (display:none in jsdom desktop width); query by aria-label.
+    const toggle = screen.getByLabelText('Open conversations');
+    expect(toggle).toBeInTheDocument();
+    expect(screen.getByText('Hesychia')).toBeInTheDocument();
+    toggle.click();
+    expect(onOpenConversations).toHaveBeenCalledTimes(1);
+  });
+});

llm-fe/src/llm-fe/components/Header2/Header2.tsx

@@ -31,6 +31,50 @@ const HeaderContainer = styled.header`
   }
 `;
 
+const BrandCluster = styled.div`
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  min-width: 0;
+  flex: 1;
+`;
+
+const ConversationsToggle = styled.button`
+  display: none;
+  flex-shrink: 0;
+  align-items: center;
+  justify-content: center;
+  gap: 0.35rem;
+  margin: 0;
+  padding: 0.35rem 0.55rem;
+  border: 1px solid ${({ theme }) => theme.colors.cardBorder};
+  border-radius: 0.65rem;
+  background: ${({ theme }) =>
+    theme.darkMode ? 'rgba(255, 255, 255, 0.08)' : 'rgba(0, 0, 0, 0.06)'};
+  color: ${({ theme }) => theme.colors.text};
+  cursor: pointer;
+  transition: background 0.2s ease;
+
+  &:hover {
+    background: ${({ theme }) =>
+      theme.darkMode ? 'rgba(255, 255, 255, 0.14)' : 'rgba(0, 0, 0, 0.1)'};
+  }
+
+  @media (max-width: 768px) {
+    display: inline-flex;
+  }
+`;
+
+const ConversationsToggleLabel = styled.span`
+  font-size: 0.8rem;
+  font-weight: 600;
+  white-space: nowrap;
+
+  @media (max-width: 380px) {
+    display: none;
+  }
+`;
+
 const Logo = styled.div`
   display: flex;
   align-items: center;
@@ -51,6 +95,8 @@ const LogoWordmark = styled.h4`
   margin: 0;
   font-size: 1.5rem;
   white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
   font-weight: 700;
 
   @media (max-width: 768px) {
@@ -139,6 +185,14 @@ const HamburgerIcon = ({ color }: { color: string }) => (
   </svg>
 );
 
+const ConversationsMenuIcon = ({ color }: { color: string }) => (
+  <svg width="20" height="20" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
+    <path d="M3 12H21" stroke={color} strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" />
+    <path d="M3 6H21" stroke={color} strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" />
+    <path d="M3 18H21" stroke={color} strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" />
+  </svg>
+);
+
 const CloseIcon = ({ color }: { color: string }) => (
   <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
     <path d="M18 6L6 18" stroke={color} strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" />
@@ -150,9 +204,16 @@ type Header2Props = {
   absolute?: Boolean;
   light?: Boolean;
   isMini?: Boolean;
+  /** Mobile: open conversations drawer. Rendered inline beside logo when set. */
+  onOpenConversations?: () => void;
 }
 
-const Header2 = ({ absolute = false, light = false, isMini = false }: Header2Props): JSX.Element => {
+const Header2 = ({
+  absolute = false,
+  light = false,
+  isMini = false,
+  onOpenConversations,
+}: Header2Props): JSX.Element => {
   const { setAuthentication } = useContext(AuthContext);
   const { setAccount } = useContext(AccountContext);
   const navigate = useNavigate();
@@ -182,10 +243,22 @@ const Header2 = ({ absolute = false, light = false, isMini = false }: Header2Pro
 
   return (
     <HeaderContainer>
+      <BrandCluster>
+        {onOpenConversations && (
+          <ConversationsToggle
+            type="button"
+            onClick={onOpenConversations}
+            aria-label="Open conversations"
+          >
+            <ConversationsMenuIcon color={theme.colors.text} />
+            <ConversationsToggleLabel>Conversations</ConversationsToggleLabel>
+          </ConversationsToggle>
+        )}
         <Logo onClick={() => navigate('/')}>
           <LogoMark src={hesychiaMark} alt="" />
           <LogoWordmark>Hesychia</LogoWordmark>
         </Logo>
+      </BrandCluster>
 
       {/* Desktop Nav */}
       <Nav>

llm-fe/src/llm-fe/pages/AsyncDashboard2/AsyncDashboard2.tsx

@@ -2,7 +2,7 @@ import React, { useContext, useEffect, useRef, useState } from "react";
 import styled, { ThemeContext } from "styled-components";
 import { Formik, Form, Field } from "formik";
 import * as Yup from "yup";
-import { AttachFile, Delete, Send, Menu, Close } from "@mui/icons-material"; // Keeping icons for now, can replace later if needed
+import { AttachFile, Delete, Send, Close } from "@mui/icons-material"; // Keeping icons for now, can replace later if needed
 import { Tooltip } from "@mui/material";
 import Markdown from "markdown-to-jsx";
 
@@ -63,34 +63,6 @@ const Sidebar = styled.div<{ $isOpen: boolean }>`
   }
 `;
 
-const MobileSidebarToggle = styled.button`
-  display: none;
-  position: absolute;
-  top: calc(4.75rem + env(safe-area-inset-top, 0px)); /* Below header */
-  left: 1rem;
-  z-index: 15;
-  padding: 0.5rem 1rem;
-  background: ${({ theme }) => theme.main};
-  color: white;
-  border: none;
-  border-radius: 2rem;
-  font-weight: 600;
-  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
-  cursor: pointer;
-  transition: all 0.2s ease;
-
-  &:hover {
-    transform: translateY(-2px);
-    box-shadow: 0 6px 16px rgba(0,0,0,0.3);
-  }
-
-  @media (max-width: 768px) {
-    display: flex;
-    align-items: center;
-    gap: 0.5rem;
-  }
-`;
-
 const Overlay = styled.div<{ $isOpen: boolean }>`
   display: none;
   position: fixed;
@@ -454,15 +426,10 @@ const AsyncDashboardInner = (): JSX.Element => {
   return (
     <PageContainer>
       <ParticleBackground />
-      <Header2 />
+      <Header2 onOpenConversations={() => setIsSidebarOpen(true)} />
 
       <Overlay $isOpen={isSidebarOpen} onClick={() => setIsSidebarOpen(false)} />
 
-      <MobileSidebarToggle onClick={() => setIsSidebarOpen(true)}>
-        <Menu fontSize="small" />
-        <span>Conversations</span>
-      </MobileSidebarToggle>
-
       <Sidebar $isOpen={isSidebarOpen}>
         <MobileSidebarHeader>
           <span>Conversations</span>