[codex] Polish issue board workflows (#4224)

## Thinking Path

> - Paperclip orchestrates AI agents for zero-human companies
> - Human operators supervise that work through issue lists, issue
detail, comments, inbox groups, markdown references, and
profile/activity surfaces
> - The branch had many small UI fixes that improve the operator loop
but do not need to ship with backend runtime migrations
> - These changes belong together as board workflow polish because they
affect scanning, navigation, issue context, comment state, and markdown
clarity
> - This pull request groups the UI-only slice so it can merge
independently from runtime/backend changes
> - The benefit is a clearer board experience with better issue context,
steadier optimistic updates, and more predictable keyboard navigation

## What Changed

- Improves issue properties, sub-issue actions, blocker chips, and issue
list/detail refresh behavior.
- Adds blocker context above the issue composer and stabilizes
queued/interrupted comment UI state.
- Improves markdown issue/GitHub link rendering and opens external
markdown links in a new tab.
- Adds inbox group keyboard navigation and fold/unfold support.
- Polishes activity/avatar/profile/settings/workspace presentation
details.

## Verification

- `pnpm exec vitest run ui/src/components/IssueProperties.test.tsx
ui/src/components/IssueChatThread.test.tsx
ui/src/components/MarkdownBody.test.tsx ui/src/lib/inbox.test.ts
ui/src/lib/optimistic-issue-comments.test.ts`

## Risks

- Low to medium risk: changes are UI-focused but cover high-traffic
issue and inbox surfaces.
- This branch intentionally does not include the backend runtime changes
from the companion PR; where UI calls newer API filters, unsupported
servers should continue to fail visibly through existing API error
handling.
- Visual screenshots were not captured in this heartbeat; targeted
component/helper tests cover the changed behavior.

> 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-based coding agent runtime, shell/git tool use
enabled. Exact hosted model build and context window are not exposed in
this Paperclip heartbeat environment.

## 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
- [ ] 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

ui/src/pages/ExecutionWorkspaceDetail.tsx

@@ -535,7 +535,7 @@ export function ExecutionWorkspaceDetail() {
           </p>
         </div>
 
-        <Card>
+        <Card className="rounded-none">
           <CardHeader>
             <CardTitle>Services and jobs</CardTitle>
             <CardDescription>
@@ -584,7 +584,7 @@ export function ExecutionWorkspaceDetail() {
 
         {activeTab === "configuration" ? (
           <div className="space-y-4 sm:space-y-6">
-            <Card>
+            <Card className="rounded-none">
               <CardHeader>
                 <CardTitle>Workspace settings</CardTitle>
                 <CardDescription>
@@ -594,7 +594,7 @@ export function ExecutionWorkspaceDetail() {
                   <Button
                     variant="destructive"
                     size="sm"
-                    className="w-full sm:w-auto"
+                    className="w-full rounded-none sm:w-auto"
                     onClick={() => setCloseDialogOpen(true)}
                     disabled={workspace.status === "archived"}
                   >
@@ -804,7 +804,7 @@ export function ExecutionWorkspaceDetail() {
               </CardContent>
             </Card>
 
-            <Card>
+            <Card className="rounded-none">
               <CardHeader>
                 <CardTitle>Workspace context</CardTitle>
                 <CardDescription>Linked objects and relationships</CardDescription>
@@ -850,7 +850,7 @@ export function ExecutionWorkspaceDetail() {
               </CardContent>
             </Card>
 
-            <Card>
+            <Card className="rounded-none">
               <CardHeader>
                 <CardTitle>Concrete location</CardTitle>
                 <CardDescription>Paths and refs</CardDescription>
@@ -896,7 +896,7 @@ export function ExecutionWorkspaceDetail() {
             </Card>
           </div>
         ) : activeTab === "runtime_logs" ? (
-          <Card>
+          <Card className="rounded-none">
             <CardHeader>
               <CardTitle>Runtime and cleanup logs</CardTitle>
               <CardDescription>Recent operations</CardDescription>
@@ -913,7 +913,7 @@ export function ExecutionWorkspaceDetail() {
             ) : workspaceOperationsQuery.data && workspaceOperationsQuery.data.length > 0 ? (
               <div className="space-y-3">
                 {workspaceOperationsQuery.data.map((operation) => (
-                  <div key={operation.id} className="rounded-md border border-border/80 bg-background px-4 py-3">
+                  <div key={operation.id} className="rounded-none border border-border/80 bg-background px-4 py-3">
                     <div className="flex flex-col gap-3 sm:flex-row sm:items-start sm:justify-between">
                       <div className="space-y-1">
                         <div className="text-sm font-medium">{operation.command ?? operation.phase}</div>