Alpha: eliminar referencias Teloprax + dashboard estilo shadcn demo

- Sidebar: logo 'A', título Alpha / KAPPA Hub
- Login: icono Alpha, sin branding Teloprax
- Dashboard rediseñado: 4 stats cards + historia clínica + actividad + tabla
- Theme: default shadcn-vue (colores demo page)
- Favicon: 'A' sobre fondo neutral
- Eliminado NavMain.vue no usado

src/components/ui/collapsible/Collapsible.vue

@@ -0,0 +1,19 @@
+<script setup lang="ts">
+import type { CollapsibleRootEmits, CollapsibleRootProps } from 'reka-ui'
+import { CollapsibleRoot, useForwardPropsEmits } from 'reka-ui'
+
+const props = defineProps<CollapsibleRootProps>()
+const emits = defineEmits<CollapsibleRootEmits>()
+
+const forwarded = useForwardPropsEmits(props, emits)
+</script>
+
+<template>
+  <CollapsibleRoot
+    v-slot="slotProps"
+    data-slot="collapsible"
+    v-bind="forwarded"
+  >
+    <slot v-bind="slotProps" />
+  </CollapsibleRoot>
+</template>

src/components/ui/collapsible/CollapsibleContent.vue

@@ -0,0 +1,15 @@
+<script setup lang="ts">
+import type { CollapsibleContentProps } from 'reka-ui'
+import { CollapsibleContent } from 'reka-ui'
+
+const props = defineProps<CollapsibleContentProps>()
+</script>
+
+<template>
+  <CollapsibleContent
+    data-slot="collapsible-content"
+    v-bind="props"
+  >
+    <slot />
+  </CollapsibleContent>
+</template>

src/components/ui/collapsible/CollapsibleTrigger.vue

@@ -0,0 +1,15 @@
+<script setup lang="ts">
+import type { CollapsibleTriggerProps } from 'reka-ui'
+import { CollapsibleTrigger } from 'reka-ui'
+
+const props = defineProps<CollapsibleTriggerProps>()
+</script>
+
+<template>
+  <CollapsibleTrigger
+    data-slot="collapsible-trigger"
+    v-bind="props"
+  >
+    <slot />
+  </CollapsibleTrigger>
+</template>

src/components/ui/collapsible/index.ts

@@ -0,0 +1,3 @@
+export { default as Collapsible } from './Collapsible.vue'
+export { default as CollapsibleContent } from './CollapsibleContent.vue'
+export { default as CollapsibleTrigger } from './CollapsibleTrigger.vue'