[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>

server/src/__tests__/health-dev-server-token.test.ts

@@ -1,4 +1,4 @@
-import { mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { existsSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
 import os from "node:os";
 import path from "node:path";
 import express from "express";
@@ -126,3 +126,80 @@ describe("GET /health dev-server supervisor access", () => {
     }
   });
 });
+
+describe("POST /health/dev-server/restart", () => {
+  it("records a manual restart request for the dev runner", async () => {
+    const previousFile = process.env.PAPERCLIP_DEV_SERVER_STATUS_FILE;
+    process.env.PAPERCLIP_DEV_SERVER_STATUS_FILE = createDevServerStatusFile({
+      dirty: true,
+      lastChangedAt: "2026-03-20T12:00:00.000Z",
+      changedPathCount: 1,
+      changedPathsSample: ["server/src/routes/health.ts"],
+      pendingMigrations: [],
+      lastRestartAt: "2026-03-20T11:30:00.000Z",
+    });
+
+    try {
+      const app = express();
+      app.use("/health", healthRoutes(undefined));
+
+      const res = await request(app).post("/health/dev-server/restart");
+
+      expect(res.status).toBe(202);
+      expect(res.body).toEqual({ status: "restart_requested" });
+
+      const requestPath = path.join(
+        path.dirname(process.env.PAPERCLIP_DEV_SERVER_STATUS_FILE),
+        "dev-server-restart-request.json",
+      );
+      expect(existsSync(requestPath)).toBe(true);
+      expect(JSON.parse(readFileSync(requestPath, "utf8"))).toMatchObject({
+        reason: "manual_restart_now",
+      });
+    } finally {
+      if (previousFile === undefined) {
+        delete process.env.PAPERCLIP_DEV_SERVER_STATUS_FILE;
+      } else {
+        process.env.PAPERCLIP_DEV_SERVER_STATUS_FILE = previousFile;
+      }
+    }
+  });
+
+  it("rejects unauthenticated manual restarts in authenticated mode", async () => {
+    const previousFile = process.env.PAPERCLIP_DEV_SERVER_STATUS_FILE;
+    process.env.PAPERCLIP_DEV_SERVER_STATUS_FILE = createDevServerStatusFile({
+      dirty: true,
+      changedPathCount: 1,
+      changedPathsSample: ["server/src/routes/health.ts"],
+      pendingMigrations: [],
+    });
+
+    try {
+      const app = express();
+      app.use((req, _res, next) => {
+        (req as any).actor = { type: "none", source: "none" };
+        next();
+      });
+      app.use(
+        "/health",
+        healthRoutes(undefined, {
+          deploymentMode: "authenticated",
+          deploymentExposure: "private",
+          authReady: true,
+          companyDeletionEnabled: true,
+        }),
+      );
+
+      const res = await request(app).post("/health/dev-server/restart");
+
+      expect(res.status).toBe(403);
+      expect(res.body).toEqual({ error: "board_access_required" });
+    } finally {
+      if (previousFile === undefined) {
+        delete process.env.PAPERCLIP_DEV_SERVER_STATUS_FILE;
+      } else {
+        process.env.PAPERCLIP_DEV_SERVER_STATUS_FILE = previousFile;
+      }
+    }
+  });
+});