[codex] Improve workspace navigation and runtime UI (#4089)

## Thinking Path

> - Paperclip agents do real work in project and execution workspaces.
> - Operators need workspace state to be visible, navigable, and
copyable without digging through raw run logs.
> - The branch included related workspace cards, navigation, runtime
controls, stale-service handling, and issue-property visibility.
> - These changes share the workspace UI and runtime-control surfaces
and can stand alone from unrelated access/profile work.
> - This pull request groups the workspace experience changes into one
standalone branch.
> - The benefit is a clearer workspace overview, better metadata copy
flows, and more accurate runtime service controls.

## What Changed

- Polished project workspace summary cards and made workspace metadata
copyable.
- Added a workspace navigation overview and extracted reusable project
workspace content.
- Squared and polished the execution workspace configuration page.
- Fixed stale workspace command matching and hid stopped stale services
in runtime controls.
- Showed live workspace service context in issue properties.

## Verification

- `pnpm install --frozen-lockfile`
- `pnpm exec vitest run
ui/src/components/ProjectWorkspaceSummaryCard.test.tsx
ui/src/lib/project-workspaces-tab.test.ts
ui/src/components/Sidebar.test.tsx
ui/src/components/WorkspaceRuntimeControls.test.tsx
ui/src/components/IssueProperties.test.tsx`
- `pnpm exec vitest run packages/shared/src/workspace-commands.test.ts
--config /dev/null` because the root Vitest project config does not
currently include `packages/shared` tests.
- Split integration check: merged after runtime/governance,
dev-infra/backups, and access/profiles with no merge conflicts.
- Confirmed this branch does not include `pnpm-lock.yaml`.

## Risks

- Medium risk: touches workspace navigation, runtime controls, and issue
property rendering.
- Visual layout changes may need browser QA, especially around smaller
screens and dense workspace metadata.
- No database migrations are included.

> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.

## Model Used

- OpenAI Codex, GPT-5.4 tool-enabled coding model, agentic
code-editing/runtime with local shell and GitHub CLI access; exact
context window and reasoning mode are not exposed by the Paperclip
harness.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] If this change affects the UI, I have included before/after
screenshots
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] I will address all Greptile and reviewer comments before
requesting merge

---------

Co-authored-by: Paperclip <noreply@paperclip.ing>

ui/src/components/Sidebar.tsx

@@ -10,6 +10,7 @@ import {
   Network,
   Boxes,
   Repeat,
+  GitBranch,
   Settings,
 } from "lucide-react";
 import { useQuery } from "@tanstack/react-query";
@@ -20,6 +21,7 @@ import { SidebarAgents } from "./SidebarAgents";
 import { useDialog } from "../context/DialogContext";
 import { useCompany } from "../context/CompanyContext";
 import { heartbeatsApi } from "../api/heartbeats";
+import { instanceSettingsApi } from "../api/instanceSettings";
 import { queryKeys } from "../lib/queryKeys";
 import { useInboxBadge } from "../hooks/useInboxBadge";
 import { Button } from "@/components/ui/button";
@@ -30,6 +32,10 @@ export function Sidebar() {
   const { openNewIssue } = useDialog();
   const { selectedCompanyId, selectedCompany } = useCompany();
   const inboxBadge = useInboxBadge(selectedCompanyId);
+  const { data: experimentalSettings } = useQuery({
+    queryKey: queryKeys.instance.experimentalSettings,
+    queryFn: () => instanceSettingsApi.getExperimental(),
+  });
   const { data: liveRuns } = useQuery({
     queryKey: queryKeys.liveRuns(selectedCompanyId!),
     queryFn: () => heartbeatsApi.liveRunsForCompany(selectedCompanyId!),
@@ -37,6 +43,7 @@ export function Sidebar() {
     refetchInterval: 10_000,
   });
   const liveRunCount = liveRuns?.length ?? 0;
+  const showWorkspacesLink = experimentalSettings?.enableIsolatedWorkspaces === true;
 
   function openSearch() {
     document.dispatchEvent(new KeyboardEvent("keydown", { key: "k", metaKey: true }));
@@ -94,6 +101,9 @@ export function Sidebar() {
           <SidebarNavItem to="/issues" label="Issues" icon={CircleDot} />
           <SidebarNavItem to="/routines" label="Routines" icon={Repeat} />
           <SidebarNavItem to="/goals" label="Goals" icon={Target} />
+          {showWorkspacesLink ? (
+            <SidebarNavItem to="/workspaces" label="Workspaces" icon={GitBranch} />
+          ) : null}
         </SidebarSection>
 
         <SidebarProjects />