…ery across platforms

Add clickable file links for inline markdown path references and edit/write/apply_patch file entries so desktop and web users can open changed files directly from the timeline.

Move inline file-path parsing into a shared helper and add focused tests, including Windows file URL handling, so clickable markdown file links stay stable as parsing rules evolve.

Render clickable tool filenames as native buttons with focus-visible styles so edit/write/apply_patch file links are accessible and keep existing click-to-open behavior.

Route markdown and tool file-link clicks to the desktop openPath integration when available, with in-app review fallback if external open fails. Also harden file-ref parsing for wrapped paths and ensure in-app fallback activates the opened tab.

When external open is unavailable or fails, opening from clickable file refs now preserves optional line numbers by selecting the target line in the review file tab.

…ions

Add spring-based animations to the prompt input composer:
- Mode toggle (shell/conversation) indicator uses spring cubic-bezier
- Submit and plus buttons animate with individual scale, opacity, and blur
- Tray items (agent, model, variant selectors) crossfade with spring
- Shell label animates in/out opposite to normal mode controls
- Add TextStrikethrough component for todo item completion
- Add truncate support to TextReveal
- Wire up count mask/height/width props through composer region

…ometer with TextReveal

- Shell submessage now uses Motion's animate() with width: "auto" for
  spring-driven width reveal instead of CSS grid 0fr→1fr transition
- Skip animation on page load (sawPending flag), only animate live tool calls
- Fix baseline alignment with overflow: clip instead of overflow: hidden
- Replace TextOdometer with TextReveal in production (session-turn, todo-dock)
- Remove TextOdometer component, CSS, and stories
- Add TextReveal to thinking-heading story
- Update shell submessage story with visualDuration/bounce sliders

…submessage fade to JS

- Fix 6 instances where TextShimmer was destroyed/recreated via <Show>
  swap instead of toggling active prop (bash, webfetch, edit, write,
  context tools, basic-tool fallback)
- Move shell submessage opacity/blur from CSS transitions to animate()
  so they respect the animate prop and don't fire on page load
- Remove data-visible attribute pattern, all animation now driven by
  Motion's animate() when animate=true

- Remove Math.ceil rounding from spring animation frames to eliminate
  1px oscillation during height transitions
- Add will-change:height and contain:layout style during active springs
  for better compositor performance
- Replace blanket ResizeObserver gate with spring target deduplication
  so genuine content changes can re-target mid-flight without feedback loops
- Apply same Math.ceil removal and will-change/contain hints to the
  thinking box show/hide animations in session-turn

Remove rAF debounce from ResizeObserver callback in createAutoScroll
so scrollToBottom fires in the same frame as layout changes (no 1-frame
lag). Add GPU layer promotion (translateZ) on GrowBox and layout
containment on assistant content to reduce cross-element repaint.

Switch the scroll viewport to flex-direction: column-reverse so the
browser natively anchors to the bottom (scrollTop=0 = bottom). This
eliminates the 1-frame jitter between content height changes and scroll
position updates. Update all scrollTop math across auto-scroll, scroll
spy, gesture detection, hash scroll, and custom thumb to account for
the inverted coordinate system.

- Pass props.animate (not live()) to Message so user message GrowBox
  mounts with animate=true and properly runs height + fade animation
- Remove Math.ceil from BasicTool height spring to prevent 1px jitter
- Remove rAF debounce from BasicTool ResizeObserver for same-frame updates
- Use live() for AssistantParts to defer animation until streaming starts

…pacing

Disable browser scroll anchoring (overflow-anchor: none) which
interferes with column-reverse, and restore scrollTop synchronously
before paint instead of in rAF with delta math.