Overhaul AuthDialog's login step:
- Add translation keys for every previously-hardcoded string (titles,
buttons, placeholders, status labels, validation/errors) across all
sixteen locales.
- The secret-key form is no longer collapsible — it's always open and is
the first option, followed by 'Log in with extension', then a
text-with-arrow link to the remote-signer step.
- Move the key-file upload icon onto the same row as the nsec input
(instead of beside the submit button); submit button is now full-width
below.
- Surface extension-login errors as a destructive toast rather than
writing them into the nsec input's inline error.
- Replace the centered 'Back' text buttons with a back arrow in the
top-left of the dialog header.
Also correct AGENTS.md's i18n section: the project ships fifteen
non-English locales (hi, id, sw, tr, zh-Hant were missing from the list).
lemon
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