feat: add resources page with file management

- Add /resources page with file listing, filtering, and bulk operations
- Add useResources composable for file state management
- Add sidenav header and nav components for resources section
- Add files list API endpoint (GET /api/files)
- Track file size during upload
- Add resources link to home navigation

app/components/Sidenav/NavHome.vue

@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import { useFloating, offset, flip, shift, autoUpdate, hide } from '@floating-ui/vue';
-import type { DialogType } from '~/composables/useDialog';
+import { DialogType } from '~/composables/useDialog';
 
 const { openDialog } = useDialog();
 const { agents, createAgent, deleteAgent, updateAgent } = await useAgents();
@@ -115,7 +115,8 @@ onMounted(() => {
                 </span>
             </div>
         </SidenavItem>
-        <SidenavItem to="/" name="Home" icon="i-mynaui-home" />
+        <SidenavItem to="/" name="Home" icon="i-mynaui-home" active />
+        <SidenavItem to="/resources" name="Resources" icon="i-tabler-books" />
 
         <!-- Header Toggle -->
         <button
@@ -134,7 +135,7 @@ onMounted(() => {
                     class="disabled:cursor-wait flex items-center gap-2 px-1 h-9 shrink-0 rounded-lg md:text-sm text-[var(--text-secondary)] @hover:bg-[var(--color-hover)] transition-colors disabled:opacity-50 w-full">
                     <div class="h-9 w-9 md:h-7 md:w-7 flex items-center justify-center">
                         <span v-if="creatingAgent" class="i-svg-spinners-ring-resize text-5 md:text-4"></span>
-                        <span v-else class="i-mynaui-plus text-5 md:text-4"></span>
+                        <span v-else class="i-mynaui-plus-solid text-5 md:text-4"></span>
                     </div>
                     <span>New Agent</span>
                 </button>