[codex] Avoid lazy loading local character avatars

[Promansis]

Linked issue

Closes #37

Why this change

Importing multiple PNG character cards can immediately refresh character avatar thumbnails with local inline image data. Those thumbnails were marked for lazy loading, which can produce browser console warnings around load timing even though the image source is already local to the app.

What changed

• Added a characters-owned avatar loading helper that keeps data: and blob: avatar sources eager while preserving lazy loading for normal URLs.
• Applied the helper to Character Library card thumbnails and character group member thumbnails.
• Updated the local Promansis work tracker for issue Multi-PNG lazy-load warning #37.

Owner layer: React UI in src/features/characters.

Validation

• pnpm typecheck
• pnpm build
• cargo check --manifest-path src-tauri/Cargo.toml
• pnpm check:docs when docs, skills, or repo guidance changed
• Ran pnpm tauri dev and tested the app path manually
• Verified the affected feature in the right mode(s): chat, roleplay, game, settings/providers, imports/exports, or assets

Also ran the combined pnpm check, which completed frontend typecheck, Rust check, and docs guidance check.

Manual verification notes

Manual desktop smoke still needed: run pnpm tauri dev, open Character Library, import multiple PNG character cards, keep the browser/devtools console open, and confirm import succeeds without the lazy-load warning appearing as the new cards render.

Docs impact

• No docs changes needed
• Updated docs/developer/* or repo guidance as needed

UI evidence

No screenshot attached; this fixes browser console behavior for local character avatar rendering.

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