Previously the importer enforced a PNG/SVG whitelist and threw `RepositoryIconAssetStoreError.unsupportedExtension` for everything else. The whitelist was redundant — the file picker already filters to image UTTypes, and a corrupt or unrenderable file falls back to the dashed-questionmark placeholder via `RepositoryIconImage`. Drop the gate so JPG / WebP / HEIC / GIF / TIFF / BMP / etc. all work without any extra plumbing. - Remove `RepositoryIconAssetStoreError` and the extension whitelist in the live store. Files with no extension fall back to a generic `.img` suffix on the destination filename so the round-trip still works. - Reducer's import effect collapses to a single `catch error in` branch using `error.localizedDescription`; the dedicated `errorMessage(for:)` helper is gone. - Picker's `fileImporter` widens from `[.png, .svg]` to `[.image, .svg]`. SVG stays explicit because UTType conformance for SVG-as-`.image` has been spotty across older OS revisions — redundant on macOS 26+ but cheap insurance. - `isTintable` logic unchanged — only `.svg` filenames get the template-tint branch; bitmaps render with their own colors. Help text generalized: "PNG icons" → "Bitmap icons", picker subtitle same. - Tests: drop `importImageRejectsUnsupportedExtension` (no longer applicable) and `importFailureSurfacesErrorMessage` (covered by the generic error path test). Add coverage for jpg/jpeg/webp/heic/ gif/tiff/bmp acceptance and for files with no extension.