make custom gloopies reusable across agents

[morgmart]

Category: improvement
User Impact: Custom gloopies now appear first in the Gloopies collection and can be reused across agents.
Problem: Custom animated gloopies were stored as attachments to individual agents, so they disappeared from reach after avatar changes and could not be selected for another agent.
Solution: Treat generated gloopies as durable local avatar-library assets, merge them into the existing Gloopies collection, and keep their lifecycle and identity independent from any one agent.

File changes

src-tauri/src/commands/avatars.rs
Enumerates valid local gloopie manifests into avatar-library snapshots, preserves newest-first ordering, and emits a library-change event after successful writes.

src/features/agents/hooks/tests/useAvatarLibrary.test.tsx
Covers startup loading, live invalidation, post-subscription reconciliation, and separation of custom media from bundled media.

src/features/agents/hooks/tests/usePersonas.test.ts
Updates lifecycle expectations so changing or deleting an agent preserves its gloopie in the library.

src/features/agents/hooks/useAvatarLibrary.ts
Loads custom gloopie IDs and media into a separate namespace and subscribes to both catalog and user-library invalidations.

src/features/agents/hooks/usePersonas.ts
Removes agent-owned garbage collection because custom gloopies are durable library assets.

src/features/agents/lib/avatarLibraryView.test.ts
Protects explicit collection-cover behavior and verifies equal bare IDs remain distinct across custom and bundled namespaces.

src/features/agents/lib/avatarLibraryView.ts
Builds the shared picker/gallery model, prepending custom gloopies and selecting the newest custom gloopie as the Gloopies cover.

src/features/agents/ui/AgentBuilderRail.tsx
Accepts full avatar references from the picker so agent creation can persist either bundled or custom avatars.

src/features/agents/ui/AgentDetailPage.tsx
Treats both bundled and custom refs as library selections and persists the full selected reference during editing.

src/features/agents/ui/AgentImageImportDialog.tsx
Preserves successfully imported gloopies even when subsequent agent creation fails.

src/features/agents/ui/AvatarCollectionOverlay.tsx
Renders the merged collection model and uses full refs for layout, hover, readiness, and selection identity.

src/features/agents/ui/AvatarLibraryPicker.tsx
Shows custom gloopies first in the existing collection and returns complete persisted refs when selected.

src/features/agents/ui/tests/AgentBuilderRail.test.tsx
Updates avatar-library fixtures for the separated custom-media state.

src/features/agents/ui/tests/AgentImageImportDialog.test.tsx
Verifies a failed agent import does not delete the committed gloopie.

src/features/agents/ui/tests/AgentsView.entry.test.tsx
Updates shared avatar-library fixtures for the new state contract.

src/features/agents/ui/tests/AvatarCollectionOverlay.test.tsx
Verifies overlay selection emits complete persisted references.

src/features/agents/ui/tests/AvatarLibraryPicker.test.tsx
Covers no-custom behavior, custom-first ordering, custom cover presentation, and custom selection.

src/shared/api/avatars.ts
Adds the renderer subscription for user-avatar-library changes.

src/shared/avatars/catalog.ts
Defines user-library constants and helpers for identifying library-owned avatar refs.

src/shared/i18n/locales/en/agents.json
Adds the English accessible label for custom gloopies.

src/shared/i18n/locales/es/agents.json
Adds the Spanish accessible label for custom gloopies.

Validation

• just check
• just tauri-check
• 123 focused Vitest tests across avatar APIs, library state, picker/gallery surfaces, imports, and persona lifecycle