diff --git a/app/resources/js/components/AppShell.vue b/app/resources/js/components/AppShell.vue
index b2f84455..393dfd30 100644
--- a/app/resources/js/components/AppShell.vue
+++ b/app/resources/js/components/AppShell.vue
@@ -9,7 +9,7 @@
  * Источник дизайна: liderra_v8_handoff/concepts/v8_login.html (auth),
  * v8_dashboard.html (app), v8_errors.html (error).
  */
-import { computed } from 'vue';
+import { computed, defineAsyncComponent, type Component } from 'vue';
 import { RouterView, useRoute } from 'vue-router';
 import AdminLayout from '../layouts/AdminLayout.vue';
 import AppLayout from '../layouts/AppLayout.vue';
@@ -17,6 +17,11 @@ import AuthLayout from '../layouts/AuthLayout.vue';
 
 const route = useRoute();
 const layoutName = computed(() => route.meta.layout ?? 'app');
+
+// Dev-only overlay: tree-shaken from production bundle via import.meta.env.DEV guard.
+const DevIndexOverlay: Component | null = import.meta.env.DEV
+    ? defineAsyncComponent(() => import('./DevIndexOverlay.vue'))
+    : null;
 </script>
 
 <template>
@@ -24,4 +29,5 @@ const layoutName = computed(() => route.meta.layout ?? 'app');
     <RouterView v-else-if="layoutName === 'error'" />
     <AdminLayout v-else-if="layoutName === 'admin'" />
     <AppLayout v-else />
+    <component :is="DevIndexOverlay" v-if="DevIndexOverlay" />
 </template>
diff --git a/app/resources/js/components/DevIndexOverlay.vue b/app/resources/js/components/DevIndexOverlay.vue
new file mode 100644
index 00000000..1ef80443
--- /dev/null
+++ b/app/resources/js/components/DevIndexOverlay.vue
@@ -0,0 +1,125 @@
+<template>
+    <Teleport to="body">
+        <div
+            v-if="currentId !== null && currentTarget"
+            class="dx-badge"
+            :class="{ 'dx-badge--copied': justCopied }"
+            :style="badgePosition"
+            @click.stop="copyToClipboard"
+        >
+            <span class="dx-badge__num">#{{ currentId }}</span>
+            <span class="dx-badge__meta">{{ tagLabel }} · "{{ textPreview }}"</span>
+        </div>
+    </Teleport>
+</template>
+
+<script setup lang="ts">
+import { computed, onMounted, onBeforeUnmount, ref } from 'vue';
+import { useDevIndices } from '../composables/useDevIndices';
+
+const { currentId, currentTarget, hoverEnabled, setTarget, reset } = useDevIndices();
+
+const cursorX = ref(0);
+const cursorY = ref(0);
+const justCopied = ref(false);
+let mousemoveRAF: number | null = null;
+
+const tagLabel = computed(() => {
+    const t = currentTarget.value;
+    if (!t) return '';
+    return t.tagName.toLowerCase();
+});
+
+const textPreview = computed(() => {
+    const t = currentTarget.value;
+    if (!t) return '';
+    const text = (t.textContent ?? '').trim().slice(0, 24);
+    return text || '—';
+});
+
+const badgePosition = computed(() => ({
+    left: `${cursorX.value + 12}px`,
+    top: `${cursorY.value + 12}px`,
+}));
+
+function onMousemove(e: MouseEvent) {
+    if (!hoverEnabled.value) return;
+    cursorX.value = e.clientX;
+    cursorY.value = e.clientY;
+
+    if (mousemoveRAF !== null) return;
+    mousemoveRAF = requestAnimationFrame(() => {
+        mousemoveRAF = null;
+        const el = document.elementFromPoint(e.clientX, e.clientY) as HTMLElement | null;
+        if (!el) {
+            setTarget(null);
+            return;
+        }
+        const withDx = el.closest('[data-dx]') as HTMLElement | null;
+        setTarget(withDx);
+    });
+}
+
+function onKeydown(e: KeyboardEvent) {
+    if (e.key === 'Escape') {
+        reset();
+    }
+}
+
+async function copyToClipboard() {
+    if (currentId.value === null) return;
+    try {
+        await navigator.clipboard.writeText(`#${currentId.value}`);
+        justCopied.value = true;
+        setTimeout(() => (justCopied.value = false), 400);
+    } catch {
+        // clipboard may be unavailable in some contexts; silent fail OK in dev tool
+    }
+}
+
+onMounted(() => {
+    document.addEventListener('mousemove', onMousemove);
+    document.addEventListener('keydown', onKeydown);
+});
+
+onBeforeUnmount(() => {
+    document.removeEventListener('mousemove', onMousemove);
+    document.removeEventListener('keydown', onKeydown);
+    if (mousemoveRAF !== null) cancelAnimationFrame(mousemoveRAF);
+});
+</script>
+
+<style scoped>
+.dx-badge {
+    position: fixed;
+    z-index: 999999;
+    pointer-events: auto;
+    cursor: pointer;
+    display: inline-flex;
+    align-items: center;
+    gap: 8px;
+    padding: 4px 10px;
+    background: #0f6e56;
+    color: #fff;
+    font-family: 'JetBrains Mono', ui-monospace, monospace;
+    font-size: 11px;
+    line-height: 1.4;
+    border-radius: 4px;
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.24);
+    user-select: none;
+    transition: background 120ms ease;
+}
+.dx-badge--copied {
+    background: #21a16e;
+}
+.dx-badge__num {
+    background: rgba(255, 255, 255, 0.22);
+    padding: 1px 6px;
+    border-radius: 3px;
+    font-weight: 600;
+}
+.dx-badge__meta {
+    letter-spacing: 0.02em;
+    opacity: 0.92;
+}
+</style>
diff --git a/app/tests/Frontend/DevIndexOverlay.spec.ts b/app/tests/Frontend/DevIndexOverlay.spec.ts
new file mode 100644
index 00000000..c43b944a
--- /dev/null
+++ b/app/tests/Frontend/DevIndexOverlay.spec.ts
@@ -0,0 +1,74 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { mount } from '@vue/test-utils';
+import { nextTick } from 'vue';
+import DevIndexOverlay from '../../resources/js/components/DevIndexOverlay.vue';
+import { useDevIndices } from '../../resources/js/composables/useDevIndices';
+
+describe('DevIndexOverlay', () => {
+    beforeEach(() => useDevIndices().reset());
+
+    it('hidden when no current target', () => {
+        mount(DevIndexOverlay, { attachTo: document.body });
+        expect(document.querySelector('.dx-badge')).toBeNull();
+    });
+
+    it('shows badge with id + tag when target is set', async () => {
+        const el = document.createElement('button');
+        el.setAttribute('data-dx', '1030');
+        el.textContent = 'Создать';
+        document.body.appendChild(el);
+
+        const dx = useDevIndices();
+        dx.setTarget(el);
+
+        mount(DevIndexOverlay, { attachTo: document.body });
+        await nextTick();
+        const badge = document.querySelector('.dx-badge');
+        expect(badge).not.toBeNull();
+        expect(badge!.textContent).toContain('1030');
+        expect(badge!.textContent!.toLowerCase()).toContain('button');
+
+        document.body.removeChild(el);
+    });
+
+    it('Esc clears the target', async () => {
+        const el = document.createElement('div');
+        el.setAttribute('data-dx', '5');
+        document.body.appendChild(el);
+        const dx = useDevIndices();
+        dx.setTarget(el);
+
+        mount(DevIndexOverlay, { attachTo: document.body });
+        await nextTick();
+
+        document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape' }));
+        await nextTick();
+
+        expect(dx.currentId.value).toBeNull();
+        document.body.removeChild(el);
+    });
+
+    it('clicking the badge copies "#<id>" to clipboard', async () => {
+        const writeText = vi.fn().mockResolvedValue(undefined);
+        Object.defineProperty(navigator, 'clipboard', {
+            value: { writeText },
+            configurable: true,
+        });
+
+        const el = document.createElement('button');
+        el.setAttribute('data-dx', '1030');
+        document.body.appendChild(el);
+        useDevIndices().setTarget(el);
+
+        mount(DevIndexOverlay, { attachTo: document.body });
+        await nextTick();
+
+        const badge = document.querySelector('.dx-badge') as HTMLElement;
+        expect(badge).not.toBeNull();
+        badge.click();
+        await nextTick();
+        expect(writeText).toHaveBeenCalledWith('#1030');
+
+        document.body.removeChild(el);
+    });
+});