feat: Claude Code Monitor — lanes, pipelines and a merged workspace

Internal SmartGift build of a Claude Code monitoring dashboard.

Lanes: a durable unit of parallel agent work, one per working directory,
tracked across session restarts. Managed lanes are git worktrees the
dashboard provisions and can reset or remove behind a three-check destroy
guard and a counted preflight; adopted lanes are directories you already
own and are never destroyable.

Pipelines: a lane moves through pipeline stages. A stage the agent declares
with evidence renders green; a stage inferred from the tool-event stream
renders dashed amber and never counts as done. Detection is forward-only
within a 30-minute window, and never writes the declared stage.

Workspace: one page at /run with a lane grid, the selected lane's pipeline,
and a full Claude console behind a disclosure.

desktop/scripts/install.js

@@ -0,0 +1,40 @@
+#!/usr/bin/env node
+/**
+ * @file Desktop dependency installer with actionable failure help.
+ *
+ * Thin wrapper around `npm install` (which still runs the `postinstall`
+ * `electron-builder install-app-deps` to rebuild native modules for Electron).
+ * On success it behaves exactly like a bare `npm install`. On failure — almost
+ * always the `better-sqlite3` native build — it prints the prerequisite
+ * guidance + the no-toolchain alternative commands, then exits non-zero so the
+ * normal command still fails loudly rather than silently leaving a half-set-up
+ * `node_modules`.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+const { spawnSync } = require("node:child_process");
+const path = require("node:path");
+const { printNativeDepHelp, hasBetterSqliteBinary } = require("./preflight");
+
+const desktopRoot = path.resolve(__dirname, "..");
+
+// On Windows `npm` is a `.cmd` shim that `spawnSync` can only launch via a
+// shell; without this it fails with ENOENT. POSIX is unaffected.
+const result = spawnSync("npm", ["install"], {
+  cwd: desktopRoot,
+  stdio: "inherit",
+  shell: process.platform === "win32",
+});
+
+// `npm install` failed outright (e.g. node-gyp could not find a compiler), or
+// it "succeeded" but the native binary never landed (a prebuilt download was
+// skipped). Either way the desktop app cannot boot — surface the fix and fail.
+if (result.status !== 0) {
+  printNativeDepHelp("`npm install` failed while building the native better-sqlite3 module.");
+  process.exit(result.status || 1);
+}
+
+if (!hasBetterSqliteBinary()) {
+  printNativeDepHelp("Dependencies installed, but the better-sqlite3 native binary is missing.");
+  process.exit(1);
+}