feat(ui): redesign workspace shell with context panel, tabbed sidebars, and faster diff UX (#433)

* feat: tabbed right sidebar, context panel, floating diff comments

* fix: auto-close left sidebar when context panel opens

- Increase default context panel width from 520 to 600 pixels
- Increase sidebar minimum width from 200 to 300 pixels
- Replace collapsible component with custom button in diff view

* refactoring: rework sidebars, tabs, and file tree layout

- Rewrite AnimatedTabs as segment-style with sliding indicator
- Upgrade SidebarFilesTree to match FilesView features (context menus,
  git status, file icons, CRUD dialogs, fuzzy search ranking)
- Restructure FilesView header: tabs row + actions row, remove breadcrumbs
- Show relative path in context panel header, track active tab
- Allow left sidebar to stay open alongside context panel
- Hide diff/files tabs from header on desktop (mobile-only)
- Move chevron after group name in session sidebar
- Compact tab heights in right sidebar and git view
- Size PreviewToggleButton to match other action buttons
- Remove directory loading spinner from folder icons

* feat: add project icon and color customization

- Enable users to assign custom icons to projects
- Allow users to choose accent colors for projects
- Stabilize repo status UI during project switching

* feat: add scroll fade indicators to editor tabs

* style: reduce spacing and icon sizes in header

* style: adjust tab component padding from uniform to vertical-horizontal

* feat: Add session state indicators to project tabs

* feat: Enhance session status handling and improve UI responsiveness

* fix: preserve upstream tracking on branch rename

* fix: improve initial remote selection for pull requests

- Uses saved remote name from previous session when available
- Selects remote based on tracking branch when possible
- Falls back to origin or first available remote

* perf(diff): faster highlight, stable stacked scroll

- split/unified Pierre worker pools; prefer shiki-wasm
- align diff CSS line-height; disable scroll anchoring; drop WebKit compositing hacks
- harden stacked pin/align (cancel on user scroll/input); prevent overscroll
- make overlay scrollbar MutationObserver optional; disable for diff container

* feat: handle binary files in diff view

* fix: adjust project tabs layout and drag regions

* style: update drag overlay visual styling

* feat: enable number keys to switch projects in the sidebar

* fix: recognize octet-stream as text-based MIME type

* feat: add keyboard navigation to context panel

* feat: add session pinning to sidebar

- Pin important sessions to keep them at the top
- Pinned sessions persist across browser sessions

* refactor: move context usage display from chat input to header

packages/ui/src/components/views/git/ChangeRow.tsx

@@ -125,13 +125,33 @@ export const ChangeRow = React.memo<ChangeRowProps>(function ChangeRow({
         >
           {descriptor.code}
         </span>
-        <span
-          className="flex-1 min-w-0 truncate typography-ui-label text-foreground"
-          style={{ direction: 'rtl', textAlign: 'left' }}
-          title={file.path}
-        >
-          {file.path}
-        </span>
+        {(() => {
+          const lastSlash = file.path.lastIndexOf('/');
+          if (lastSlash === -1) {
+            return (
+              <span
+                className="flex-1 min-w-0 truncate typography-ui-label text-foreground"
+                style={{ direction: 'rtl', textAlign: 'left' }}
+                title={file.path}
+              >
+                {file.path}
+              </span>
+            );
+          }
+          const dir = file.path.slice(0, lastSlash);
+          const name = file.path.slice(lastSlash);
+          return (
+            <span className="flex-1 min-w-0 flex items-baseline overflow-hidden" title={file.path}>
+              <span
+                className="min-w-0 truncate typography-ui-label text-muted-foreground"
+                style={{ direction: 'rtl', textAlign: 'left' }}
+              >
+                {dir}
+              </span>
+              <span className="flex-shrink-0 typography-ui-label"><span className="text-muted-foreground">/</span><span className="text-foreground">{name.slice(1)}</span></span>
+            </span>
+          );
+        })()}
         <span className="shrink-0 typography-micro">
           <span style={{ color: 'var(--status-success)' }}>+{insertions}</span>
           <span className="text-muted-foreground mx-0.5">/</span>