fix: UI polish and provider fixes

- Add animate-pulse CSS animation for loading states
- Add Ctrl+I/Ctrl+B markdown shortcuts in chat input
- Improve chat input resize with mirror element
- Add reasoning duration display and shimmer effect
- Add confirmation dialog for deleting all models
- Simplify RowVirtualizerDynamic resize handling
- Fix DialogType imports (type -> value)
- Fix ollama cloud model name resolution
- Make vllm auth header optional
- Various icon and styling fixes

app/components/ModelSelector.vue

@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { ref, computed, watch, nextTick } from 'vue';
 import { useFloating, offset, flip, shift, autoUpdate, size, hide } from '@floating-ui/vue';
-import type { DialogType } from '~/composables/useDialog';
+import { DialogType } from '~/composables/useDialog';
 import type { Model, ModelWithProvider, Provider, ProviderWithModels } from '~/composables/useModels';
 import { sortByReleaseDate } from '~/utils/sort';
 import RowVirtualizerFixed from './RowVirtualizerFixed.vue';