When DeepSeek emits a Write/Edit/Read call with no arguments (typically
output-token truncation on a large file before the args stream), the tool
returned a cryptic "missing file_path". Now it explains the likely cause
(ran out of output tokens — raise Effort / smaller file) or lists the keys
that did arrive, which both helps the user and gives the model a usable hint.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Sidebar sessions showed raw ids and had no management actions.

- Titles: title a brand-new session from its first user message
  (mac-agent sessionSetTitle) so the sidebar shows a human label immediately
  instead of the id; the Rust read-time derive remains the fallback.
- Archive / Delete: new session_delete + session_archive Rust commands
  (archive moves the .jsonl into sessions/archived/, excluded from the list;
  delete removes it — both guarded against path-traversal ids) + tauri-api
  wrappers. Sidebar rows reveal 🗄/🗑 on hover (delete confirms); removing the
  active session resets the chat via a new onSessionRemoved callback.
- Freshness: the sidebar now polls (8s) + reloads on active-session change so
  titles and new sessions surface without a remount.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

The dock icon (.icns) was stale — generated from an older render — so it
showed washed-out while the PNGs were already the crisp white-cat-on-blue
mark. Regenerated icon.icns from icon.svg via `tauri icon` so the dock /
Finder icon matches the intended design. (Non-macOS assets that tauri icon
emits — Windows/Android/iOS — were discarded; this is a macOS-only app.)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Reshape the message stream toward Claude Code: a centered ~760px readable
column instead of full-bleed, drop the heavy YO/DC avatar chips, give user
turns a soft bubble while assistant/system are plain prose, and tighten the
inter-message spacing. Sidebar search + top-bar cleanup land in pass 2.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Desktop sessions tag each message line type:"message", but CLI/headless
sessions persist bare {role,content} lines with no type field. session_read
and derive_session_title both filtered on type=="message", so CLI sessions
loaded as an empty chat and showed their id instead of a title. Accept a
line as a message when type=="message" OR (type absent AND role is
user/assistant). Verified: a CLI session went 0→1 messages with a derived
title.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…earch, compact project

- Composer now aligns to the centered message column (760px) instead of
  spanning full width — cohesive chat area like Claude Code.
- Sidebar: add a session search/filter box; replace the heavy boxed PROJECT
  chip with a compact one-line project row (the header breadcrumb carries the
  path already).
- Add a dev-only full-app preview harness (preview-app.html/.tsx) that renders
  <App/> with a mocked Tauri invoke, so layout can be screenshotted + iterated
  without a rebuild. Not in the prod bundle.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…er icon

The inspector rail's four hint icons (▤◐📁ⓘ) all expanded the same Inspector
panel, so "clicking anything on the right is just the inspector". Rework it
into a VS Code-style activity bar: the 48px rail is always present on the far
right and each icon opens its OWN panel to its left, exactly one at a time.

- ⓘ Inspector — plan / context / recent files / session (plan badge + context tint)
- 📄 Files     — the file preview panel (Source / Diff / History)
- ⚙ Settings   — the Settings shell (main-area screen)

App: replace inspectorExpanded/inspectorFocus/expandInspector with
inspectorOpen + a filesCollapsed flag; toggleInspector/toggleFiles/openFile
enforce single-panel mutual exclusion (opening one closes the other; an active
icon closes its panel; Files with no tabs invokes the picker). The rail is now
rendered unconditionally as the last grid child; .inspector-open gains the 48px
rail track so the inspector squeezes chat beside the rail instead of replacing
it. Monochrome SVG icons replace the unicode glyphs.

preview-app: mock plugin:dialog|open + correct tool_read ({content}) so the
file panel is exercisable in the browser preview.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…r inset

The 30px shell padding already clears the macOS traffic lights, so each column's
extra top padding (sidebar 18 / chat-header 12 / rail 14 / inspector-head 18)
was pure dead space — content sat ~46px down with an empty strip above it.
Trim those so the brand / breadcrumb / pills / inspector title align ~34px from
the window top, just below the titlebar (Claude-Code-style compact top).

The inspector loses its panel top padding and the sticky head's −18px margin
trick (top:0 now), keeping its title aligned with the rest.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>