macro-clips slice 4b: button instance dialog

- ButtonInstanceDialog.vue edits the three instance-scope fields:
  label (with uniqueness error surface), disabled flag, onClick
  actions via the shared ActionEditor
- commit waits on a successful label set so collisions show inline
  instead of silently dropping the rename
- Timeline wires click on a button-instance block to open the dialog

Creation/placement UX (sidebar entry + drag-to-track) and the per-state
layer editor are still deferred — this slice only makes existing
instances editable once something (devtools, later slice) has put them
on a clip track.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/ButtonInstanceDialog.vue

@@ -0,0 +1,218 @@
+<script setup lang="ts">
+import { computed, ref, watch } from 'vue'
+import { PhTrash } from '@phosphor-icons/vue'
+import { useSceneStore } from '@/stores/scene'
+import { t } from '@/i18n'
+import { Modal } from '@/components/ui'
+import ActionEditor from './ActionEditor.vue'
+import type { Action } from '@/types/scene'
+
+const props = defineProps<{
+  modelValue: boolean
+  instanceId: string | null
+}>()
+const emit = defineEmits<{ 'update:modelValue': [value: boolean] }>()
+
+const store = useSceneStore()
+
+const instance = computed(() => {
+  if (!props.instanceId) return null
+  return (
+    store.scene.buttonInstances?.find((bi) => bi.id === props.instanceId) ??
+    null
+  )
+})
+
+const buttonClip = computed(() => {
+  const bi = instance.value
+  if (!bi) return null
+  return store.scene.buttonClips?.find((c) => c.id === bi.buttonClipId) ?? null
+})
+
+const localLabel = ref('')
+const localDisabled = ref(false)
+const localActions = ref<Action[]>([])
+const labelError = ref<string | null>(null)
+
+watch(
+  [() => props.modelValue, () => props.instanceId],
+  ([open, iid]) => {
+    if (!open || !iid) return
+    const bi = store.scene.buttonInstances?.find((x) => x.id === iid)
+    if (!bi) return
+    localLabel.value = bi.label ?? ''
+    localDisabled.value = !!bi.disabled
+    localActions.value = (bi.onClick ?? []).map((a) => ({ ...a }))
+    labelError.value = null
+  },
+  { immediate: true },
+)
+
+function commit(): boolean {
+  if (!props.instanceId) return true
+  // Label uniqueness.
+  const label = localLabel.value.trim()
+  const ok = store.setButtonInstanceLabel(props.instanceId, label)
+  if (!ok) {
+    labelError.value = t('buttonInstanceDialog.labelCollision', { name: label })
+    return false
+  }
+  store.setButtonInstanceOnClick(props.instanceId, localActions.value)
+  store.setButtonInstanceDisabled(props.instanceId, localDisabled.value)
+  return true
+}
+
+function close() {
+  if (commit()) emit('update:modelValue', false)
+}
+
+function removeInstance() {
+  if (!props.instanceId) return
+  store.removeButtonInstance(props.instanceId)
+  emit('update:modelValue', false)
+}
+</script>
+
+<template>
+  <Modal
+    :model-value="modelValue"
+    size="md"
+    :title="t('buttonInstanceDialog.title')"
+    @update:model-value="(v) => (v ? null : close())"
+  >
+    <div v-if="instance" class="body">
+      <div class="meta">
+        <span class="meta-label">{{ t('buttonInstanceDialog.clipName') }}</span>
+        <span class="meta-value">{{ buttonClip?.name ?? '?' }}</span>
+      </div>
+      <label class="field">
+        {{ t('buttonInstanceDialog.label') }}
+        <input
+          type="text"
+          :value="localLabel"
+          :placeholder="t('buttonInstanceDialog.labelPlaceholder')"
+          @input="localLabel = ($event.target as HTMLInputElement).value; labelError = null"
+        />
+        <span v-if="labelError" class="err">{{ labelError }}</span>
+      </label>
+      <label class="field row">
+        <input
+          type="checkbox"
+          :checked="localDisabled"
+          @change="localDisabled = ($event.target as HTMLInputElement).checked"
+        />
+        {{ t('buttonInstanceDialog.disabled') }}
+      </label>
+      <div class="field">
+        <span class="field-label">{{ t('buttonInstanceDialog.onClick') }}</span>
+        <ActionEditor
+          :actions="localActions"
+          @update:actions="localActions = $event"
+        />
+      </div>
+    </div>
+    <template #footer>
+      <button class="btn danger" @click="removeInstance">
+        <PhTrash :size="12" />
+        {{ t('buttonInstanceDialog.remove') }}
+      </button>
+      <span class="spacer"></span>
+      <button class="btn primary" @click="close">
+        {{ t('buttonInstanceDialog.done') }}
+      </button>
+    </template>
+  </Modal>
+</template>
+
+<style scoped>
+.body {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+  padding: 12px 14px;
+}
+
+.meta {
+  display: flex;
+  gap: 8px;
+  align-items: baseline;
+  font-size: 12px;
+}
+
+.meta-label {
+  color: var(--text-dim);
+}
+
+.meta-value {
+  color: var(--text);
+  font-weight: 500;
+}
+
+.field {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  font-size: 11px;
+  color: var(--text-dim);
+}
+
+.field.row {
+  flex-direction: row;
+  align-items: center;
+  gap: 8px;
+  font-size: 12px;
+  color: var(--text);
+}
+
+.field-label {
+  font-size: 11px;
+  color: var(--text-dim);
+}
+
+.field input[type='text'] {
+  background: var(--bg);
+  border: 1px solid var(--border);
+  color: var(--text);
+  padding: 4px 7px;
+  border-radius: var(--radius-sm);
+  font-size: 12px;
+  font-family: inherit;
+}
+
+.err {
+  color: var(--danger);
+  font-size: 11px;
+}
+
+.btn {
+  display: inline-flex;
+  align-items: center;
+  gap: 5px;
+  padding: 5px 10px;
+  background: var(--panel);
+  border: 1px solid var(--border);
+  color: var(--text);
+  border-radius: var(--radius-sm);
+  font-size: 12px;
+}
+
+.btn:hover {
+  background: var(--panel-hover);
+}
+
+.btn.primary {
+  background: var(--accent);
+  border-color: var(--accent);
+  color: #fff;
+}
+
+.btn.danger:hover {
+  background: var(--danger-soft);
+  color: var(--danger);
+  border-color: var(--danger);
+}
+
+.spacer {
+  flex: 1;
+}
+</style>

src/components/Timeline.vue

@@ -31,6 +31,7 @@ import { sampleLayer } from '@/lib/interpolate'
 import { snapToCandidates } from '@/lib/timelineSnap'
 import { confirmDialog, promptDialog } from '@/components/ui'
 import ScriptFrameDialog from './ScriptFrameDialog.vue'
+import ButtonInstanceDialog from './ButtonInstanceDialog.vue'
 import { t } from '@/i18n'
 import { kfSelectionKey, useKfSelection, type KfSelectionKey } from '@/composables/useKfSelection'
 import { showLocked } from '@/composables/useShowLocked'
@@ -1484,6 +1485,14 @@ const BUTTON_STATES = ['normal', 'hover', 'pressed', 'disabled'] as const
 const scriptDialogOpen = ref(false)
 const scriptDialogFrameId = ref<string | null>(null)
 
+// Button instance dialog state
+const buttonDialogOpen = ref(false)
+const buttonDialogInstanceId = ref<string | null>(null)
+function openButtonInstance(id: string) {
+  buttonDialogInstanceId.value = id
+  buttonDialogOpen.value = true
+}
+
 function openScriptFrame(frameId: string) {
   scriptDialogFrameId.value = frameId
   scriptDialogOpen.value = true
@@ -2274,6 +2283,7 @@ onBeforeUnmount(() => {
                   :class="{ disabled: bi.disabled }"
                   :style="buttonInstanceStyle(bi)"
                   :title="bi.label ?? buttonClipById.get(bi.buttonClipId)?.name ?? ''"
+                  @click.stop="openButtonInstance(bi.id)"
                 >
                   <span
                     v-for="state in BUTTON_STATES"
@@ -2578,6 +2588,10 @@ onBeforeUnmount(() => {
       v-model="scriptDialogOpen"
       :frame-id="scriptDialogFrameId"
     />
+    <ButtonInstanceDialog
+      v-model="buttonDialogOpen"
+      :instance-id="buttonDialogInstanceId"
+    />
   </div>
 </template>
 

src/i18n/messages.ts

@@ -396,6 +396,17 @@ export const en = {
     remove: 'Delete frame',
     done: 'Done',
   },
+  buttonInstanceDialog: {
+    title: 'Button instance',
+    clipName: 'Button',
+    label: 'Label',
+    labelPlaceholder: 'e.g. playButton',
+    labelCollision: 'Label "{name}" is already used by another button instance.',
+    disabled: 'Start disabled',
+    onClick: 'On click',
+    remove: 'Delete instance',
+    done: 'Done',
+  },
 } as const
 
 export type Messages = typeof en