feat(FN-4060): fix mobile keyboard layout regression in QuickChatFAB compos

Fixes the keyboard-up composer gap in QuickChatFAB (Step 2), with companion regression tests covering the mobile keyboard layout and QuickChatFAB component behavior.

Fusion-Task-Id: FN-4060

Fusion-Task-Lineage: 341b16b1-47db-4e23-b9fe-87cf0782da6a

packages/cli/src/commands/db.ts

@@ -0,0 +1,68 @@
+import { TaskStore } from "@fusion/core";
+import { resolveProject } from "../project-context.js";
+
+type VacuumResult = {
+  beforeSize: number;
+  afterSize: number;
+  durationMs: number;
+};
+
+type VacuumDatabase = {
+  vacuum?: () => Promise<VacuumResult> | VacuumResult;
+  exec?: (sql: string) => void;
+  getPath?: () => string;
+};
+
+async function resolveStore(projectName?: string): Promise<TaskStore> {
+  try {
+    return (await resolveProject(projectName)).store;
+  } catch {
+    const store = new TaskStore(process.cwd());
+    await store.init();
+    return store;
+  }
+}
+
+function formatBytes(bytes: number): string {
+  if (bytes <= 0) return "0 B";
+  const units = ["B", "KB", "MB", "GB"];
+  let value = bytes;
+  let unitIndex = 0;
+  while (value >= 1024 && unitIndex < units.length - 1) {
+    value /= 1024;
+    unitIndex += 1;
+  }
+  return `${value.toFixed(unitIndex === 0 ? 0 : 2)} ${units[unitIndex]}`;
+}
+
+export async function runDbVacuum(projectName?: string): Promise<void> {
+  let db: VacuumDatabase;
+  let result: VacuumResult;
+
+  try {
+    const store = await resolveStore(projectName);
+    db = store.getDatabase() as unknown as VacuumDatabase;
+
+    if (typeof db.vacuum === "function") {
+      result = await db.vacuum();
+    } else {
+      const start = Date.now();
+      db.exec?.("VACUUM");
+      result = { beforeSize: 0, afterSize: 0, durationMs: Date.now() - start };
+    }
+  } catch (error) {
+    console.error(`Database VACUUM failed: ${(error as Error).message}`);
+    process.exit(1);
+    return;
+  }
+
+  const path = db.getPath?.() ?? "<unknown>";
+  if (path === ":memory:") {
+    console.log("VACUUM skipped for in-memory database.");
+  } else {
+    console.log(
+      `VACUUM completed in ${result.durationMs}ms (${formatBytes(result.beforeSize)} -> ${formatBytes(result.afterSize)}): ${path}`,
+    );
+  }
+  process.exit(0);
+}