Several user-visible error messages on Desktop are rendered with plain
`Text` composables, which means they can't be selected or copied. That
makes it awkward to share an error in a bug report or paste a hex error
string into a search.
Wrap the error text in `SelectionContainer` at the canonical sites:
- `commons.ui.components.LoadingState`: wrap the description in
`EmptyState` and the message in `ErrorState`. `EmptyState` is reused
as the in-feed error renderer (e.g. 'Error loading feed' with the
underlying error in `description`), so this covers feed/loading
errors across screens that use these helpers.
- `ComposeNoteDialog`: wrap the validation error and the upload error
in the compose-note dialog.
- `auth/LoginCard` (Nostr Connect): wrap the connection error.
- `auth/KeyInputField`: wrap the supporting-text error so the inline
message under the nsec input field can be copied.
No visual changes \u2014 `SelectionContainer` does not affect layout or
styling. Selection works on Compose Desktop (mouse drag) and on Android
(long-press) without further changes.
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