feat(room): extend the centred message band, date pill and composer width to group and channel rooms, matching 1:1

src/app/components/message/layout/Channel.css.ts

@@ -16,10 +16,12 @@ export const ChannelRow = style({
   display: 'flex',
   alignItems: 'flex-start',
   gap: ChannelAvatarGap,
-  // Span the full pane edge-to-edge so the hover highlight runs the whole
+  // Span the full message-column width so the hover highlight runs edge-to-edge
-  // width like Discord: cancel MessageBase's S400/S200 horizontal padding with
+  // like Discord: cancel MessageBase's S400/S200 horizontal padding with negative
-  // negative margins, then re-add the 16px avatar gutter as paddingLeft (so the
+  // margins, then re-add the 16px avatar gutter as paddingLeft (so the avatar's
-  // avatar's left edge lands exactly 16px from the screen edge — Discord cozy).
+  // left edge lands 16px from the column edge — Discord cozy). NB: the column is
+  // the centred BubbleTimelineBand, so that edge is the band's content edge, not
+  // the screen edge (the band adds 12px native / 40px desktop outside this).
   marginLeft: `calc(-1 * ${config.space.S400})`,
   marginRight: `calc(-1 * ${config.space.S200})`,
   paddingLeft: ChannelEdgePad,
@@ -82,35 +84,6 @@ export const ChannelThreadSummary = style({
   marginTop: config.space.S100,
 });
 
-// Horizontal line + centered label. Spans the full row width including
-// the avatar slot so the line reads as a section break, not a per-message
-// chrome element.
-export const ChannelDayDividerRoot = style({
-  display: 'flex',
-  alignItems: 'center',
-  gap: config.space.S300,
-  paddingLeft: config.space.S400,
-  paddingRight: config.space.S400,
-  paddingTop: config.space.S400,
-  paddingBottom: config.space.S400,
-});
-
-export const ChannelDayDividerLine = style({
-  flex: 1,
-  height: '1px',
-  backgroundColor: color.SurfaceVariant.ContainerLine,
-});
-
-export const ChannelDayDividerLabel = style({
-  fontSize: toRem(11),
-  fontWeight: 600,
-  letterSpacing: '0.06em',
-  textTransform: 'uppercase',
-  color: color.SurfaceVariant.OnContainer,
-  opacity: 0.7,
-  flexShrink: 0,
-});
-
 // Sysline (membership / room.create / pinned-events). Compact single
 // row aligned with the body gutter — the sysline sits where messages'
 // body would, indented past the avatar slot, so the column reads

src/app/components/message/layout/Channel.tsx

@@ -98,29 +98,6 @@ export const ChannelLayout = as<'div', ChannelLayoutProps>(
   )
 );
 
-export type ChannelDayDividerProps = {
-  label: ReactNode;
-};
-
-// Section break between days in the channels timeline. Horizontal line
-// + centered uppercase label, spans full row including the avatar gutter
-// so it reads as a structural separator.
-export const ChannelDayDivider = as<'div', ChannelDayDividerProps>(
-  ({ className, label, ...props }, ref) => (
-    <div
-      className={classNames(css.ChannelDayDividerRoot, className)}
-      role="separator"
-      aria-label={typeof label === 'string' ? label : undefined}
-      {...props}
-      ref={ref}
-    >
-      <span className={css.ChannelDayDividerLine} aria-hidden />
-      <span className={css.ChannelDayDividerLabel}>{label}</span>
-      <span className={css.ChannelDayDividerLine} aria-hidden />
-    </div>
-  )
-);
-
 export type ChannelEventContentProps = {
   iconSrc: IconSrc;
   content: ReactNode;

src/app/features/room/RoomTimeline.css.ts

@@ -7,7 +7,8 @@ import {
   VOJO_STICKY_DATE_TOP_PX,
 } from '../../styles/horseshoe';
 
-// Bubble (1:1 DM) timeline band — centre the message column in the same band
+// Timeline band (every room class — 1:1 bubble, group, channel) — centre the
+// message column in the same band
 // the AI-bot chat uses (ThreadDrawerContentAssistant), so on wide web viewports
 // the chat is centred instead of spreading edge-to-edge. Inert on mobile (band
 // > viewport). The composer mirrors this via ComposerBubbleBand; both read the
@@ -32,7 +33,8 @@ export const BubbleTimelineBand = style({
   },
 });
 
-// Day capsule for the bubble (1:1 DM) timeline («Среда, 4 июня» / «Сегодня») —
+// Day capsule for the timeline («Среда, 4 июня» / «Сегодня»), shared by every
+// room class (1:1 bubble, group, channel) —
 // a single dark-blue pill in the message-input tone (Surface.Container, the same
 // token the composer card paints with), centred, with generous rounding. No
 // border, no echo.

src/app/features/room/RoomTimeline.tsx

@@ -48,8 +48,6 @@ import {
   MSticker,
   ImageContent,
   EventContent,
-  CHANNEL_MESSAGE_SPACING,
-  ChannelDayDivider,
 } from '../../components/message';
 import {
   factoryRenderLinkifyWithMention,
@@ -1302,7 +1300,8 @@ export function RoomTimeline({
 
   const { t } = useTranslation();
 
-  // Sticky day capsules (bubble layout only). Each day boundary renders a REAL
+  // Sticky day capsules (every room class — 1:1 bubble, group, channel). Each
+  // day boundary renders a REAL
   // capsule that is a CSS `position: sticky` element (see RoomTimeline.css
   // `[data-sticky-dates='on'] BubbleDayCapsuleRow`). The browser pins it on the
   // compositor while you scroll through a day, then lets it settle back into its
@@ -1319,7 +1318,6 @@ export function RoomTimeline({
   // `offsetTop` is the in-flow position (sticky doesn't change it), so the
   // front detection and the virtual paginator's offsetTop maths stay in agreement.
   useEffect(() => {
-    if (messageLayout === 'channel') return undefined;
     const scrollEl = getScrollElement();
     if (!scrollEl) return undefined;
 
@@ -1370,7 +1368,7 @@ export function RoomTimeline({
       delete scrollEl.dataset.stickyDates;
       showAll();
     };
-  }, [getScrollElement, messageLayout]);
+  }, [getScrollElement]);
 
   // Group `m.call.member` (StateEvent.GroupCallMemberPrefix) events into one
   // aggregate bubble per CALL SESSION. Each session is delimited by «joined
@@ -2635,18 +2633,13 @@ export function RoomTimeline({
       return timeDayMonYear(mEvent.getTs());
     })();
 
-    const renderDayDivider = () =>
+    const renderDayDivider = () => (
-      messageLayout === 'channel' ? (
+      // Every room class (1:1 bubble, group, channel) draws the same centred,
-        <MessageBase space={CHANNEL_MESSAGE_SPACING}>
+      // single dark-blue date pill. The row is the real `position: sticky`
-          <ChannelDayDivider label={dayLabel} />
+      // element — `data-day-divider` is the hook the scroll effect uses to engage
-        </MessageBase>
+      // stickiness and pick the front pill when several pile up. No MessageBase
-      ) : (
+      // wrapper: the row must be a direct child of the timeline column so its
-        // Bubble (1:1 DM): a centred, single dark-blue date pill. The row is the
+      // sticky containing block is the whole day, not a one-row box.
-        // real `position: sticky` element — `data-day-divider` is the hook the
-        // scroll effect uses to engage stickiness and pick the front pill when
-        // several pile up. No MessageBase wrapper: the row must be a direct child
-        // of the timeline column so its sticky containing block is the whole day,
-        // not a one-row box.
       <div className={css.BubbleDayCapsuleRow} data-day-divider="true">
         <span className={css.BubbleDayCapsule} role="separator">
           {dayLabel}
@@ -2673,7 +2666,7 @@ export function RoomTimeline({
 
   return (
     <Box grow="Yes" style={{ position: 'relative' }}>
-      {/* Bubble (1:1 DM) day dates are the inline capsules themselves, made
+      {/* Day dates are the inline capsules themselves (every room class), made
           sticky via real CSS `position: sticky` (engaged by the effect above) —
           no separate floating pill. */}
       {unreadFloatShown && (
@@ -2703,8 +2696,8 @@ export function RoomTimeline({
         <Box
           direction="Column"
           justifyContent="End"
-          // Bubble (1:1 DM) layout: centre the message column in the AI-chat band.
+          // Every room class centres its message column in the AI-chat band.
-          className={messageLayout === 'stream' ? css.BubbleTimelineBand : undefined}
+          className={css.BubbleTimelineBand}
           style={{
             minHeight: '100%',
             // Bottom padding reserves room for the overlay composer painted

src/app/features/room/RoomView.css.ts

@@ -24,22 +24,11 @@ import {
 // same Android-WebView stuck-:hover suppression.
 export const ChatComposer = style({});
 
-// Desktop web only: constrain the composer card to ~3/4 of the chat pane
+// Composer band (every room class) — fit the input form to the same ~960px
-// width and centre it, instead of spanning edge-to-edge (user point 15).
+// centred band as the timeline (BubbleTimelineBand) + the AI-bot chat
-// Applied conditionally in RoomView.tsx via `useScreenSizeContext` so native
+// (ThreadComposerAssistant), so on wide web the composer width matches the
-// / mobile / tablet keep the full-width card the user is happy with.
+// messages. Horizontal gutter matches BubbleTimelineBand / the bot chat: 12px on
-export const ComposerDesktopClamp = style({
+// native, 40px on desktop, so the composer stays aligned with the message column.
-  maxWidth: '75%',
-  marginLeft: 'auto',
-  marginRight: 'auto',
-});
-
-// Bubble (1:1 DM) composer band — fit the input form to the same ~960px centred
-// band as the bubble timeline + the AI-bot chat (ThreadComposerAssistant), so on
-// wide web the composer width matches the messages. Horizontal gutter matches
-// BubbleTimelineBand / the bot chat: 12px on native, 40px on desktop, so the
-// composer stays aligned with the message column. Replaces ComposerDesktopClamp
-// for 1:1 DMs.
 export const ComposerBubbleBand = style({
   width: '100%',
   maxWidth: toRem(VOJO_BUBBLE_BAND_PX),

src/app/features/room/RoomView.tsx

@@ -1,10 +1,9 @@
 import React, { useCallback, useEffect, useLayoutEffect, useRef, useState } from 'react';
-import { Box, Text, color, config, toRem } from 'folds';
+import { Box, Text, color, config } from 'folds';
 import { EventType } from 'matrix-js-sdk';
 import { ReactEditor } from 'slate-react';
 import { isKeyHotkey } from 'is-hotkey';
 import classNames from 'classnames';
-import { ScreenSize, useScreenSizeContext } from '../../hooks/useScreenSize';
 import { useStateEvent } from '../../hooks/useStateEvent';
 import { StateEvent } from '../../../types/matrix/room';
 import { usePowerLevelsContext } from '../../hooks/usePowerLevels';
@@ -19,9 +18,8 @@ import { useKeyDown } from '../../hooks/useKeyDown';
 import { editableActiveElement } from '../../utils/dom';
 import { useRoomPermissions } from '../../hooks/useRoomPermissions';
 import { useRoomCreators } from '../../hooks/useRoomCreators';
-import { useIsOneOnOne, useRoom } from '../../hooks/useRoom';
+import { useRoom } from '../../hooks/useRoom';
-import { useChannelsMode, useThreadDrawerOpen } from '../../hooks/useChannelsMode';
+import { useThreadDrawerOpen } from '../../hooks/useChannelsMode';
-import { VOJO_HORSESHOE_GAP_PX } from '../../styles/horseshoe';
 import * as css from './RoomView.css';
 
 const FN_KEYS_REGEX = /^F\d+$/;
@@ -91,16 +89,6 @@ export function RoomView({ eventId }: { eventId?: string }) {
   // `TimelineRenderingType.Thread` context.
   const threadDrawerOpen = useThreadDrawerOpen();
 
-  // Desktop web: centre the composer at ~3/4 width (user point 15). Native /
-  // mobile / tablet keep the full-width card.
-  const isDesktop = useScreenSizeContext() === ScreenSize.Desktop;
-
-  // 1:1 DM (bubble layout): fit the composer to the same centred ~960px band as
-  // the bubble timeline + the AI-bot chat, instead of the 75% desktop clamp.
-  const isOneOnOne = useIsOneOnOne();
-  const channelsMode = useChannelsMode();
-  const isBubble = isOneOnOne && !channelsMode;
-
   useEffect(() => {
     const el = composerWrapRef.current;
     if (!el) {
@@ -183,17 +171,11 @@ export function RoomView({ eventId }: { eventId?: string }) {
           onFocusCapture={() => setComposerHidden(false)}
         >
           <div
-            className={classNames(
+            // Every room class fits its composer to the same centred ~960px band
-              css.ChatComposer,
+            // as the timeline (BubbleTimelineBand) and the AI-bot chat, so on wide
-              isBubble ? css.ComposerBubbleBand : isDesktop && css.ComposerDesktopClamp
+            // web the input lines up with the message column. The band owns its own
-            )}
+            // responsive horizontal padding, so no inline padding here.
-            style={
+            className={classNames(css.ChatComposer, css.ComposerBubbleBand)}
-              // ComposerBubbleBand owns its own (responsive) horizontal padding;
-              // the non-bubble path keeps the fixed horseshoe-void inline padding.
-              isBubble
-                ? undefined
-                : { padding: `0 ${toRem(VOJO_HORSESHOE_GAP_PX)} ${toRem(VOJO_HORSESHOE_GAP_PX)}` }
-            }
           >
             {tombstoneEvent ? (
               <RoomTombstone