…ayout

- Replace the mobile conversation and file tab strips with the folder-and-title
  conversation header and the file breadcrumb header
- Slim the top bar to a sidebar toggle, a new-conversation button and the
  terminal, aux-panel and settings controls, matched to the desktop height and
  draggable as a window region
- Host the git branch selector on the left of the bottom status bar and the
  command launcher, context-window meter and alerts on the right
- Show only session details in the session-details tab
- Close the sidebar or file drawer after picking a conversation, starting a new
  one or opening a file
- Drop the redundant folder and branch pickers below the composer
- Register the tab close and navigation shortcuts in the always-mounted
  workspace controller so they keep working when the tab strips are hidden
- Remove the unused embedded tab-bar variants and the retired picker code

- Boost the persistent chrome hairlines with a foreground-tinted border so the
  status bar, sidebar, mobile title bar and aux tabs, and the tab-strip line and
  active-tab arch stay legible over a workspace background image
- Frost the trailing new-conversation button's hover with a backdrop blur and a
  foreground tint so it reads over the transparent tab strip
- Round the bottom branch selector and command launcher hover surfaces to full
  pills and prefix the command name with a terminal icon
- Draw a divider between the last conversation tab and the new-conversation
  button when that tab is not active

- Rewrite bare Windows drive paths (C:/…, C:\…) and file:///C:/… links to a
  schemeless /C:/… form at the remark stage so rehype-sanitize no longer reads
  the drive letter as a URL protocol and drops the href
- Keep such links clickable through the workspace file opener, stripping the
  leading slash downstream; Chinese, spaced and URL-encoded paths open correctly
- Leave rehype-sanitize/harden and the javascript:/data:/vbscript: protections
  untouched, and preserve POSIX, UNC, http(s), mailto, tel and codeg:// behavior
- Add a render-pipeline test through the real Streamdown sanitize + harden
  layers plus the click-to-open path

- Add a leading-edge LagLogThrottle: the first lag logs immediately, further
  lags within a 10s window are counted and suppressed, and the next line past
  the window reports the coalesced occurrence count and dropped-event total
- Gate the Lagged WARN in every long-lived broadcast subscriber (lifecycle
  dispatcher, automation engine, both chat-channel subscribers, pet state
  mapper, and the WebSocket global firehose) through a task-local throttle
- Keep the lagged_count metrics and the overrun recovery side-effects
  unthrottled so only the duplicate log line is suppressed

- Append a standing kill_tree=warn backstop to every constructed EnvFilter,
  including the RUST_LOG / CODEG_LOG override path, so a global debug level no
  longer emits the crate's per-PID process-scan lines that can grow the log
  file without bound
- Route the env override through a shared helper so it applies the same
  backstops (kill_tree plus the logging module's own target) as build_env_filter

- Clip long user messages to a default max height with a fading bottom
  edge, revealing a "Show more" control that expands to the full message
  and back to "Show less"
- Leave assistant messages unaffected
- Keep the fade correct whether the bubble is solid or translucent under
  a workspace background image
- Localize the toggle labels across all 10 supported languages