Fix character import drag-and-drop handling

[Promansis]

Linked issue

Closes #38

Why this change

• The Import Character modal could lose drag hover state when dragged items crossed nested drop-zone elements, and folder/unsupported drops could fail without a clear rejection.

What changed

• React UI owner: src/features/characters/components/ImportCharacterModal.tsx.
• Track drag depth for stable enter/leave handling.
• Stop propagation on drop-zone drag events and set a copy drop effect for supported file drops.
• Inspect DataTransferItems so folder-like or unsupported drops show a clear error instead of silently doing nothing.
• Updated the local bug ownership note under updates/people/promansis.md.

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

Manual verification notes

• Not manually verified in the desktop app yet.
• Suggested smoke: run pnpm tauri dev, open Settings -> Import Character, drop .json, .png, .charx, and .marinara files, then drop a folder. Supported files should import normally; folder/unsupported drops should show a clear rejection and the drag highlight should not flicker or get stuck.

Docs impact

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

UI evidence

• Not captured.

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