[codex] UI and dev ops quality-of-life (#6384)

## Thinking Path

> - Paperclip operators spend most of their time scanning the board,
inbox, sidebar, and local dev status surfaces
> - Small UI and dev-ops frictions make repeated operator workflows feel
slower than they need to be
> - The working branch contained several independent quality-of-life
improvements mixed with larger cloud work
> - Grouping these smaller UI/dev-ops changes together keeps review
overhead reasonable without merging them into feature PRs
> - This pull request collects the operator-facing QoL polish into one
standalone branch
> - The benefit is a cleaner board navigation and local dev recovery
experience without depending on cloud upstream sync

## What Changed

- Relaxed forced 44px touch targets for small inline widgets.
- Fixed mobile mention menu scrolling and sidebar spacing on
touch/mobile layouts.
- Synced inbox hover state with j/k selection.
- Moved plugin sidebar entries into the Work section.
- Added manual dev-server restart action/banner behavior.
- Logged plugin bridge 502 causes for better diagnosis.

## Verification

- `pnpm install --frozen-lockfile --ignore-scripts`
- `pnpm --filter @paperclipai/plugin-sdk build`
- `pnpm exec vitest run ui/src/components/MarkdownEditor.test.tsx
ui/src/components/Sidebar.test.tsx
ui/src/components/SidebarProjects.test.tsx ui/src/pages/Inbox.test.tsx
ui/src/components/DevRestartBanner.test.tsx
server/src/__tests__/dev-server-status.test.ts
server/src/__tests__/health-dev-server-token.test.ts
server/src/__tests__/plugin-routes-authz.test.ts` initially failed only
because plugin SDK `dist` was not built in the fresh worktree.
- Rerun after build: `pnpm exec vitest run
server/src/__tests__/plugin-routes-authz.test.ts` passed.
- The remaining targeted UI/dev-server tests passed on the first
post-install run.

## Visual Evidence

- Sidebar layout and plugin Work section: ![Sidebar
desktop](https://raw.githubusercontent.com/paperclipai/paperclip/pap-9861-ui-dev-qol/docs/pr-screenshots/pr-6384/sidebar-desktop.png)
- Inbox/task row selection and hover-state surface: ![Inbox rows
desktop](https://raw.githubusercontent.com/paperclipai/paperclip/pap-9861-ui-dev-qol/docs/pr-screenshots/pr-6384/inbox-rows-desktop.png)
- Dev restart banner desktop: ![Dev restart banner
desktop](https://raw.githubusercontent.com/paperclipai/paperclip/pap-9861-ui-dev-qol/docs/pr-screenshots/pr-6384/dev-restart-banner-desktop.png)
- Dev restart banner mobile: ![Dev restart banner
mobile](https://raw.githubusercontent.com/paperclipai/paperclip/pap-9861-ui-dev-qol/docs/pr-screenshots/pr-6384/dev-restart-banner-mobile.png)

## Risks

- Mostly UI/dev ergonomics with low data risk.
- Sidebar and inbox changes touch frequently used navigation surfaces,
so visual review on desktop/mobile is still useful.

> 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 with local shell/git/tool use.
Exact hosted model ID and context-window size are not exposed by the
local Paperclip adapter runtime.

## 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/SidebarProjects.test.tsx

@@ -19,6 +19,8 @@ const mockAuthApi = vi.hoisted(() => ({
 const mockOpenNewProject = vi.hoisted(() => vi.fn());
 const mockSetSidebarOpen = vi.hoisted(() => vi.fn());
 const mockPersistOrder = vi.hoisted(() => vi.fn());
+const mockSidebarState = vi.hoisted(() => ({ isMobile: false }));
+const mockPointerState = vi.hoisted(() => ({ fine: true }));
 
 vi.mock("@/lib/router", () => ({
   Link: ({ children, to, ...props }: { children: ReactNode; to: string }) => (
@@ -63,7 +65,7 @@ vi.mock("../context/DialogContext", () => ({
 
 vi.mock("../context/SidebarContext", () => ({
   useSidebar: () => ({
-    isMobile: false,
+    isMobile: mockSidebarState.isMobile,
     setSidebarOpen: mockSetSidebarOpen,
   }),
 }));
@@ -192,6 +194,23 @@ describe("SidebarProjects", () => {
       defaultOptions: { queries: { retry: false }, mutations: { retry: false } },
     });
     localStorage.clear();
+    mockSidebarState.isMobile = false;
+    mockPointerState.fine = true;
+    Object.defineProperty(window, "matchMedia", {
+      writable: true,
+      value: vi.fn().mockImplementation((query: string) => ({
+        matches: query.includes("(hover: hover)") && query.includes("(pointer: fine)")
+          ? mockPointerState.fine
+          : false,
+        media: query,
+        onchange: null,
+        addEventListener: vi.fn(),
+        removeEventListener: vi.fn(),
+        addListener: vi.fn(),
+        removeListener: vi.fn(),
+        dispatchEvent: vi.fn(),
+      })),
+    });
     mockProjectsApi.list.mockResolvedValue([
       makeProject({
         id: "project-a",
@@ -254,6 +273,25 @@ describe("SidebarProjects", () => {
 
     expect(projectLinkLabels(container)).toEqual(["Bravo", "Alpha", "Charlie"]);
     expect(container.querySelector('[data-testid="project-slot-project-b"]')).toBeTruthy();
+    expect(container.querySelector('[aria-roledescription="sortable"]')).toBeTruthy();
+  });
+
+  it("uses plain project rows for top mode on mobile", async () => {
+    mockSidebarState.isMobile = true;
+
+    await renderSidebarProjects();
+
+    expect(projectLinkLabels(container)).toEqual(["Bravo", "Alpha", "Charlie"]);
+    expect(container.querySelector('[aria-roledescription="sortable"]')).toBeNull();
+  });
+
+  it("uses plain project rows for top mode on coarse pointer screens", async () => {
+    mockPointerState.fine = false;
+
+    await renderSidebarProjects();
+
+    expect(projectLinkLabels(container)).toEqual(["Bravo", "Alpha", "Charlie"]);
+    expect(container.querySelector('[aria-roledescription="sortable"]')).toBeNull();
   });
 
   it("uses the heading for section menu and the plus button for project creation", async () => {