Improve sidebar workspace readability and host identity (#2790)

* fix(app): align turn footer actions

Keep running-turn actions in the same position as completed-turn actions and use the shared small icon size for both copy and fork controls.

* feat(app): improve sidebar workspace identity

Make dense sidebar workspace rows easier to scan and let each device control how connected hosts are identified.

* fix(app): keep host badges readable

Use a compact display menu and keep identity color on the host icon so translated controls fit and badge text retains standard contrast.

* fix(app): announce selected sidebar badge mode

* fix(app): retain icon-only host names for screen readers

* fix(app): name hoisted workspace rows

* fix(app): retain host identity in workspace labels

* fix(app): retain workspace status in row labels

* fix(app): defer host appearance until identity resolves

* fix(app): serialize host appearance writes

* fix(app): serialize host registry writes

* fix(app): bound sidebar host badge labels

* test(app): match workspace status labels

* fix(app): consolidate sidebar identity behavior

* test(app): assert status grouping behavior

* fix(app): keep sidebar row actions accessible

* fix(app): stabilize optimistic message layout

docs/design.md

@@ -225,6 +225,8 @@ Status pills are `palette.<color>[300]` foreground on a 10%-alpha background of
 
 Status dots — the small filled circles next to a host or agent name — are `borderRadius.full` filled with the status color (`statusSuccess`, `statusWarning`, `statusDanger`, or `foregroundMuted`). They sit in the trailing slot of a sidebar row or as a leading marker on a status pill.
 
+Identity badges — the project icon and the sidebar host badge — do not use the theme palette. They draw from the fixed ten-color identity table in `packages/app/src/styles/identity-colors.ts`, whose hexes are held to one contrast band so a color identifies rather than ranks. Identity color is a fill-only contract: project icons use it as a fill with a white letter, while host badges use it on their icon and retain the normal muted text color. The table is theme-independent by design; do not fork it per theme, and do not add hexes to it without recomputing the band.
+
 The bespoke pills in `packages/app/src/screens/settings/host-page.tsx:97-116`, `packages/app/src/components/agent-list.tsx:607-632`, and `packages/app/src/components/sidebar-workspace-list.tsx:2889-2894` are drift to be removed. New code uses `<StatusBadge>`.
 
 ---
@@ -236,7 +238,7 @@ The bespoke pills in `packages/app/src/screens/settings/host-page.tsx:97-116`, `
 - Bare `<Text>` for a section header inside settings. `<SettingsSection>` exists.
 - A "Settings" CTA on a detail page. Detail pages are settings; settings is reached from the sidebar, the host entry, or a row's kebab menu.
 - The word "checkout" in UI strings or identifiers. The term is "workspace".
-- New color tokens or hardcoded hex outside the palette. Status pill rgba backgrounds are the documented pattern (§12), not a license.
+- New color tokens or hardcoded hex outside the palette. Status pill rgba backgrounds and the identity color table are the documented exceptions (§13), not a license.
 - Placeholder text dimmed beyond `foregroundMuted`. No extra opacity, no italics, no ghost-text.
 - `onPointerEnter` and `onPointerLeave`. They do not fire on native iOS. Hover uses Pressable's `onHoverIn`/`onHoverOut` gated with `isHovered || isCompact || isNative`.
 - Raw DOM APIs without an `isWeb` guard.