Implements the redesign from docs/ui-audit.html. Rearrangement only — no
feature was removed; every control that moved kept its handler, and the
gates that used to hide things now grey them out instead.
Navigation
* The rail is one flat list: the five Workspace sub-views sit at the top
level instead of behind an accordion, with Dashboard/Monitoring pinned
at the foot and Settings below them.
* Cowork and GraphRAG stay listed and greyed while no project is
selected, rather than vanishing and resizing the menu under the user.
* Monitoring keeps its eight sub-views in its own tab strip (unhidden)
instead of doubling the rail's length.
* _goto now moves the highlight itself, fixing a long-standing bug where
programmatic navigation left the rail pointing at the previous screen.
* Rail header gained the project picker and "New chat"; RECENTS lists the
active project's threads. Both are second views of existing state — the
Cowork toolbar button and the full History panel are untouched.
* Provider / language / theme moved from the top bar to an account row at
the foot of the rail (same widgets, same signals).
Screens
* Co4E: the flow tab strip is gone (per the design); Flow Status became a
toolbar toggle with its own way back, and the three icon-only tabs became
four labelled, foldable sections in one column. One flow open at a time
is the one capability this costs; background runs are unaffected.
* Dashboard: header split into two rows; cost promoted to a hero card.
* Monitoring Overview: one scrolling column of titled sections; the model
price table got its own full-width section instead of sharing a row with
the CPU meters.
* Settings and Task editor gained a section index down the left.
* Help dock: 84x64 launcher + chevron became one 26px dot that expands to
a labelled pill on hover; "hide to the edge" moved into the panel's menu.
Layout
* The window's minimum width dropped from 1453px to 768px. The main cause
was a QTabWidget taking its minimum from the widest page even when that
page is hidden, so Co4E was forcing Project and Cowork wide.
* Secondary panes fold themselves on a narrow window and restore when it
grows, never overriding a fold the user made.
* The long dialogs no longer scroll sideways at any font size.
Verification: tools/check_*.py build a real MainWindow offscreen against a
copy of ~/.cowork_local with the schedulers no-oped. check_design_parity.py
reads its checklist straight from the audit page's own proposals.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
