feat(EntityGrid): implement infinite scroll for entity lists

Add infinite scroll functionality to EntityGrid component using VueUse's
useInfiniteScroll composable to handle large volumes of entities efficiently.

Changes:
- Integrate @vueuse/core useInfiniteScroll composable
- Add infinite scroll state management (displayedCount, reset function)
- Configure initial batch size (20 items) and increment size (20 items)
- Update displayedEntities, alphabeticalContacts to support progressive loading
- Add canLoadMore() logic for people, projects, and search modes
- Reset scroll state when search term or entities prop changes
- Remove maxItems prop (replaced by infinite scroll)
- Simplify displayEntitiesFunction signature (removed maxItems parameter)
- Update EntitySelectionStep and test files to remove max-items prop

Technical details:
- Uses template ref (scrollContainer) to access scrollable container
- Recent contacts (3) count toward initial batch for people grid
- Special entities (You, Unnamed) always displayed, don't count toward limits
- Infinite scroll works for both entity types and search results
- Constants are configurable at top of component (INITIAL_BATCH_SIZE, INCREMENT_SIZE)

This improves performance and UX when displaying large lists of contacts or
projects by loading content progressively as users scroll.

src/components/EntityGrid.vue

@@ -42,7 +42,10 @@ projects, and special entities with selection. * * @author Matthew Raymer */
     search.
   </div>
 
-  <ul class="border-t border-slate-300 mb-4 max-h-[60vh] overflow-y-auto">
+  <ul
+    ref="scrollContainer"
+    class="border-t border-slate-300 mb-4 max-h-[60vh] overflow-y-auto"
+  >
     <!-- Special entities (You, Unnamed) for people grids -->
     <template v-if="entityType === 'people'">
       <!-- "You" entity -->
@@ -152,7 +155,8 @@ projects, and special entities with selection. * * @author Matthew Raymer */
 </template>
 
 <script lang="ts">
-import { Component, Prop, Vue, Emit } from "vue-facing-decorator";
+import { Component, Prop, Vue, Emit, Watch } from "vue-facing-decorator";
+import { useInfiniteScroll } from "@vueuse/core";
 import PersonCard from "./PersonCard.vue";
 import ProjectCard from "./ProjectCard.vue";
 import SpecialEntityCard from "./SpecialEntityCard.vue";
@@ -161,6 +165,13 @@ import { PlanData } from "../interfaces/records";
 import { NotificationIface } from "../constants/app";
 import { UNNAMED_ENTITY_NAME } from "@/constants/entities";
 
+/**
+ * Constants for infinite scroll configuration
+ */
+const INITIAL_BATCH_SIZE = 20;
+const INCREMENT_SIZE = 20;
+const RECENT_CONTACTS_COUNT = 3;
+
 /**
  * EntityGrid - Unified grid layout for displaying people or projects
  *
@@ -192,14 +203,15 @@ export default class EntityGrid extends Vue {
   searchTimeout: NodeJS.Timeout | null = null;
   filteredEntities: Contact[] | PlanData[] = [];
 
+  // Infinite scroll state
+  displayedCount = INITIAL_BATCH_SIZE;
+  infiniteScrollReset?: () => void;
+  scrollContainer?: HTMLElement;
+
   /** Array of entities to display */
   @Prop({ required: true })
   entities!: Contact[] | PlanData[];
 
-  /** Maximum number of entities to display */
-  @Prop({ default: 10 })
-  maxItems!: number;
-
   /** Active user's DID */
   @Prop({ required: true })
   activeDid!: string;
@@ -240,34 +252,27 @@ export default class EntityGrid extends Vue {
    * Function to determine which entities to display (allows parent control)
    *
    * This function prop allows parent components to customize which entities
-   * are displayed in the grid, enabling advanced filtering, sorting, and
-   * display logic beyond the default simple slice behavior.
+   * are displayed in the grid, enabling advanced filtering and sorting.
+   * Note: Infinite scroll is disabled when this prop is provided.
    *
    * @param entities - The full array of entities (Contact[] or PlanData[])
    * @param entityType - The type of entities being displayed ("people" or "projects")
-   * @param maxItems - The maximum number of items to display (from maxItems prop)
    * @returns Filtered/sorted array of entities to display
    *
    * @example
    * // Custom filtering: only show contacts with profile images
-   * :display-entities-function="(entities, type, max) =>
-   *   entities.filter(e => e.profileImageUrl).slice(0, max)"
+   * :display-entities-function="(entities, type) =>
+   *   entities.filter(e => e.profileImageUrl)"
    *
    * @example
    * // Custom sorting: sort projects by name
-   * :display-entities-function="(entities, type, max) =>
-   *   entities.sort((a, b) => a.name.localeCompare(b.name)).slice(0, max)"
-   *
-   * @example
-   * // Advanced logic: different limits for different entity types
-   * :display-entities-function="(entities, type, max) =>
-   *   type === 'projects' ? entities.slice(0, 5) : entities.slice(0, max)"
+   * :display-entities-function="(entities, type) =>
+   *   entities.sort((a, b) => a.name.localeCompare(b.name))"
    */
   @Prop({ default: null })
   displayEntitiesFunction?: (
     entities: Contact[] | PlanData[],
     entityType: "people" | "projects",
-    maxItems: number,
   ) => Contact[] | PlanData[];
 
   /**
@@ -278,27 +283,27 @@ export default class EntityGrid extends Vue {
   }
 
   /**
-   * Computed entities to display - uses function prop if provided, otherwise defaults
-   * When searching, returns filtered results instead of original logic
+   * Computed entities to display - uses function prop if provided, otherwise uses infinite scroll
+   * When searching, returns filtered results with infinite scroll applied
    */
   get displayedEntities(): Contact[] | PlanData[] {
-    // If searching, return filtered results
+    // If searching, return filtered results with infinite scroll
     if (this.searchTerm.trim()) {
-      return this.filteredEntities;
+      return this.filteredEntities.slice(0, this.displayedCount);
     }
 
-    // Original logic when not searching
+    // If custom function provided, use it (disables infinite scroll)
     if (this.displayEntitiesFunction) {
-      return this.displayEntitiesFunction(
-        this.entities,
-        this.entityType,
-        this.maxItems,
-      );
+      return this.displayEntitiesFunction(this.entities, this.entityType);
+    }
+
+    // Default: projects use infinite scroll
+    if (this.entityType === "projects") {
+      return (this.entities as PlanData[]).slice(0, this.displayedCount);
     }
 
-    // Default implementation for backward compatibility
-    const maxDisplay = this.entityType === "projects" ? 10 : this.maxItems;
-    return this.entities.slice(0, maxDisplay);
+    // People: handled by recentContacts + alphabeticalContacts (both use displayedCount)
+    return [];
   }
 
   /**
@@ -314,6 +319,7 @@ export default class EntityGrid extends Vue {
 
   /**
    * Get the remaining contacts sorted alphabetically (when showing contacts and not searching)
+   * Uses infinite scroll to control how many are displayed
    */
   get alphabeticalContacts(): Contact[] {
     if (this.entityType !== "people" || this.searchTerm.trim()) {
@@ -321,13 +327,16 @@ export default class EntityGrid extends Vue {
     }
     // Skip the first 3 (recent contacts) and sort the rest alphabetically
     // Create a copy to avoid mutating the original array
-    const remaining = (this.entities as Contact[]).slice(3);
-    return [...remaining].sort((a: Contact, b: Contact) => {
+    const remaining = (this.entities as Contact[]).slice(RECENT_CONTACTS_COUNT);
+    const sorted = [...remaining].sort((a: Contact, b: Contact) => {
       // Sort alphabetically by name, falling back to DID if name is missing
       const nameA = (a.name || a.did).toLowerCase();
       const nameB = (b.name || b.did).toLowerCase();
       return nameA.localeCompare(nameB);
     });
+    // Apply infinite scroll: show based on displayedCount (minus the 3 recent)
+    const toShow = Math.max(0, this.displayedCount - RECENT_CONTACTS_COUNT);
+    return sorted.slice(0, toShow);
   }
 
   /**
@@ -438,6 +447,8 @@ export default class EntityGrid extends Vue {
   async performSearch(): Promise<void> {
     if (!this.searchTerm.trim()) {
       this.filteredEntities = [];
+      this.displayedCount = INITIAL_BATCH_SIZE;
+      this.infiniteScrollReset?.();
       return;
     }
 
@@ -474,6 +485,10 @@ export default class EntityGrid extends Vue {
             return a.name.toLowerCase().localeCompare(b.name.toLowerCase());
           });
       }
+
+      // Reset displayed count when search completes
+      this.displayedCount = INITIAL_BATCH_SIZE;
+      this.infiniteScrollReset?.();
     } finally {
       this.isSearching = false;
     }
@@ -486,6 +501,8 @@ export default class EntityGrid extends Vue {
     this.searchTerm = "";
     this.filteredEntities = [];
     this.isSearching = false;
+    this.displayedCount = INITIAL_BATCH_SIZE;
+    this.infiniteScrollReset?.();
 
     // Clear any pending timeout
     if (this.searchTimeout) {
@@ -494,6 +511,56 @@ export default class EntityGrid extends Vue {
     }
   }
 
+  /**
+   * Determine if more entities can be loaded
+   */
+  canLoadMore(): boolean {
+    if (this.displayEntitiesFunction) {
+      // Custom function disables infinite scroll
+      return false;
+    }
+
+    if (this.searchTerm.trim()) {
+      // Search mode: check filtered entities
+      return this.displayedCount < this.filteredEntities.length;
+    }
+
+    if (this.entityType === "projects") {
+      // Projects: check if more available
+      return this.displayedCount < this.entities.length;
+    }
+
+    // People: check if more alphabetical contacts available
+    // Total available = 3 recent + all alphabetical
+    const remaining = (this.entities as Contact[]).slice(RECENT_CONTACTS_COUNT);
+    const totalAvailable = RECENT_CONTACTS_COUNT + remaining.length;
+    return this.displayedCount < totalAvailable;
+  }
+
+  /**
+   * Initialize infinite scroll on mount
+   */
+  mounted(): void {
+    this.$nextTick(() => {
+      const container = this.$refs.scrollContainer as HTMLElement;
+
+      if (container) {
+        const { reset } = useInfiniteScroll(
+          container,
+          () => {
+            // Load more: increment displayedCount
+            this.displayedCount += INCREMENT_SIZE;
+          },
+          {
+            distance: 50, // pixels from bottom
+            canLoadMore: () => this.canLoadMore(),
+          },
+        );
+        this.infiniteScrollReset = reset;
+      }
+    });
+  }
+
   // Emit methods using @Emit decorator
 
   @Emit("entity-selected")
@@ -507,6 +574,24 @@ export default class EntityGrid extends Vue {
     return data;
   }
 
+  /**
+   * Watch for changes in search term to reset displayed count
+   */
+  @Watch("searchTerm")
+  onSearchTermChange(): void {
+    this.displayedCount = INITIAL_BATCH_SIZE;
+    this.infiniteScrollReset?.();
+  }
+
+  /**
+   * Watch for changes in entities prop to reset displayed count
+   */
+  @Watch("entities")
+  onEntitiesChange(): void {
+    this.displayedCount = INITIAL_BATCH_SIZE;
+    this.infiniteScrollReset?.();
+  }
+
   /**
    * Cleanup timeouts when component is destroyed
    */

src/components/EntitySelectionStep.vue

@@ -15,7 +15,6 @@ properties * * @author Matthew Raymer */
     <EntityGrid
       :entity-type="shouldShowProjects ? 'projects' : 'people'"
       :entities="shouldShowProjects ? projects : allContacts"
-      :max-items="10"
       :active-did="activeDid"
       :all-my-dids="allMyDids"
       :all-contacts="allContacts"

src/test/EntityGridFunctionPropTest.vue

@@ -19,7 +19,6 @@
       <EntityGrid
         entity-type="people"
         :entities="people"
-        :max-items="5"
         :active-did="activeDid"
         :all-my-dids="allMyDids"
         :all-contacts="people"
@@ -39,7 +38,6 @@
       <EntityGrid
         entity-type="projects"
         :entities="projects"
-        :max-items="3"
         :active-did="activeDid"
         :all-my-dids="allMyDids"
         :all-contacts="people"
@@ -152,11 +150,8 @@ export default class EntityGridFunctionPropTest extends Vue {
   customPeopleFunction = (
     entities: Contact[],
     _entityType: string,
-    maxItems: number,
   ): Contact[] => {
-    return entities
-      .filter((person) => person.profileImageUrl)
-      .slice(0, maxItems);
+    return entities.filter((person) => person.profileImageUrl);
   };
 
   /**
@@ -165,7 +160,6 @@ export default class EntityGridFunctionPropTest extends Vue {
   customProjectsFunction = (
     entities: PlanData[],
     _entityType: string,
-    _maxItems: number,
   ): PlanData[] => {
     return entities.sort((a, b) => a.name.localeCompare(b.name)).slice(0, 3);
   };
@@ -200,16 +194,16 @@ export default class EntityGridFunctionPropTest extends Vue {
    */
   get displayedPeopleCount(): number {
     if (this.useCustomFunction) {
-      return this.customPeopleFunction(this.people, "people", 5).length;
+      return this.customPeopleFunction(this.people, "people").length;
     }
-    return Math.min(5, this.people.length);
+    return Math.min(10, this.people.length); // Initial batch size for infinite scroll
   }
 
   get displayedProjectsCount(): number {
     if (this.useCustomFunction) {
-      return this.customProjectsFunction(this.projects, "projects", 3).length;
+      return this.customProjectsFunction(this.projects, "projects").length;
     }
-    return Math.min(7, this.projects.length);
+    return Math.min(10, this.projects.length); // Initial batch size for infinite scroll
   }
 }
 </script>