Move expanded formatting options (B, I, S, Code, Link, Lists, Quote)
to sit inline in the bottom toolbar right after the Aa toggle, instead
of in a separate row above the editor. File attachment previews remain
as the only element above the textarea.

…[Aa ✕ | formatting]

Passive state shows ingress buttons (mention, attach, emoji) followed by the
Aa formatting toggle. Clicking Aa swaps to expanded mode: Aa toggle, ✕ close
button, separator, then all formatting options. Ingress buttons are hidden
while formatting is open.

Matches the inline-expand design spec from the channel.

…/react

- Aa toggle uses layoutId for smooth slide between positions
- Ingress buttons (@ 📎 😊) fade out + scale down on expand
- Formatting buttons slide in from left + fade in on expand
- ✕ close button scales in alongside Aa
- Reverse animation on collapse
- Uses LayoutGroup + AnimatePresence (popLayout) matching
  existing ComposerAttachments pattern

…bels

- Reset isEmojiPickerOpen when formatting is toggled on (prevents
  emoji picker remounting open on collapse)
- Extract Aa toggle to local variable — single source of truth for
  the layoutId animation across both toolbar states
- Add aria-label to mention button, attach button, and upload spinner

- Pull Aa toggle out of AnimatePresence so it never unmounts —
  layoutId handles the smooth position slide on its own
- Remove React.Fragment wrappers — each branch is a single motion.div
  so AnimatePresence properly tracks enter/exit per element
- popLayout mode pops exiting elements out of flow immediately,
  letting enter animations start at the same time
- Ingress group uses order-[-1] to sit before Aa visually
- No staggering, no sequencing — one fluid concurrent transition

…ne image tagging

…utocomplete insertion

TipTap's setContent() roundtrips through a markdown parser that strips
trailing whitespace from text nodes. insertContent(' ') and
preserveWhitespace: 'full' also normalise it away.

Use a raw ProseMirror transaction to insert a literal space text node
after setContent, bypassing TipTap's parser entirely. Cursor is placed
after the space via TextSelection so typing continues naturally.

Applied to both applyMentionInsert and applyChannelInsert.

Timeline images now render at max-w-lg (~512px) as clickable thumbnails
with cursor-pointer and a subtle hover opacity transition.

Clicking opens a scrimmed lightbox (bg-black/80) showing the full-res
image at up to 90vh/90vw. Clicking the backdrop or pressing Escape
closes the lightbox. Includes accessible Title and Description for
Radix Dialog, and an explicit close button.

Video rendering left unchanged.

Remove overflow-hidden from the toolbar's layout-animated container.
The overflow clip (added in 50f951c to fix exit ghosting) was hiding
the Aa toggle during intermediate layout frames — when popLayout pops
the exiting group out of flow the container briefly shrinks, and
overflow-hidden clips the layoutId-animated toggle mid-reposition.

Also add layout="position" to the Aa wrapper so Framer Motion only
animates its position, not size, avoiding measurement conflicts with
the simultaneously-resizing parent.

Exit animations (opacity → 0) still look correct without the clip
since the fading elements are the intended visual.

Composer attachment thumbnail chips now open a full-view lightbox when
clicked, reusing the same Radix DialogPrimitive pattern from the
timeline markdown renderer (1ba0dd2). Videos open with native controls.

The existing remove button (X) remains unaffected — the lightbox trigger
wraps only the thumbnail content, not the remove button overlay.

Also bumps the attachment row bottom margin from mb-1 to mb-2 for
better spacing below the chips.

Replace the single boolean upload state with an uploadingCount that
tracks how many files are currently in-flight. Each upload start
increments the count; each completion or error decrements it.
isUploading remains true while count > 0.

handleDrop now processes ALL dropped files concurrently instead of
only files[0]. Each valid file fires off its own upload in parallel.

ComposerAttachments renders uploadingCount skeleton placeholders
(falls back to 1 for backwards compat when count isn't provided).

…SVG repaint

…attachments

Images now use w-full max-w-xl instead of fixed max-w-lg, so they
flex to their container width (fixes overflow in the 380px thread panel).

When a message contains multiple consecutive images, a custom remark
plugin (remarkImageGallery) groups them into an image-gallery node
that renders as a 2-column CSS grid. Single images remain unchanged.

Use a slot-based approach: reserve null slots in original order when
uploads start, then fill each slot by index as uploads complete.
pendingImeta is derived by filtering nulls, so attachments always
appear in paste/drop order regardless of completion timing.

Also: handlePaste now handles multiple media items from clipboard.

29 tests covering:
- buildHighlightPatterns: empty inputs, mentions-only, channels-only,
  both, regex escaping of special characters
- findHighlightMatches: start-of-text, after whitespace, embedded-in-word
  rejection, case insensitivity, multiple matches, longer-name priority,
  mixed @mention + #channel, empty text/patterns
- shortHash: normal, minimum, empty, short inputs
- Upload slot ordering: reserve/fill, out-of-order concurrent fills,
  removal by URL, padding edge case

…ent render

The Aa toggle was outside AnimatePresence using layoutId to animate
between positions. This caused intermittent disappearance due to
WebKit GPU compositing + Framer Motion layout cache issues.

Restructure: duplicate the Aa toggle inside both state groups
(formatting and ingress) so AnimatePresence handles the crossfade.

Removed: layoutId, LayoutGroup, overflow-hidden, will-change hack,
order-[-1] CSS trick. Kept AnimatePresence mode="popLayout".

… access

…acters

markdown.tsx changes moved to tho/timeline-media branch (PR #316).
This PR now focuses solely on composer polish.

… change

- Remove .worktree/chat-style/desktop/src-tauri from Cargo.toml exclude
  (local dev artifact, not part of this PR)
- Revert SIDEBAR_KEYBOARD_SHORTCUT from 's' back to 'b'
  (unrelated to composer polish work)

…ts mid-upload

removeAttachment now nulls out the slot instead of compacting the array,
so in-flight uploads that captured their slot index at reservation time
still write to the correct position. The public pendingImeta view already
filters nulls via useMemo.

The getTextAndCursor function maps ProseMirror positions to plain-text
offsets for the mention/channel autocomplete hooks. The block boundary
handler had an empty body, causing cursor drift of 1 per paragraph
boundary. Now increments offset by 1 for each inter-block newline.