fix(details): translate the OAuth connect button's default label

[pedrofrxncx]

Bug found while working the MCP connections UI focus area (issue #5661).

OAuthAuthenticationState (apps/web/src/components/details/connection/settings-tab/index.tsx) defaults its button label to a hardcoded English string "Authenticate" when no buttonText prop is passed. This is exactly the path hit from SettingsTab (settings-tab/index.tsx:230), so any pt-br user who opens the settings tab of a connection requiring OAuth and hasn't authenticated yet sees an untranslated English button, breaking the i18n rule that all user-facing UI strings go through t().

Fix: added details.settingsTab.authenticate to both en/details.ts and pt-br/details.ts, and changed the component default to buttonText ?? t("details.settingsTab.authenticate") instead of a hardcoded string literal. The one existing caller that already passes an explicit buttonText (apps/web/src/components/details/tool.tsx) is unaffected.

To confirm: open a connection's Settings tab for a connection requiring OAuth while not authenticated, with pt-br language selected — the button now reads "Autenticar" instead of "Authenticate".

Checks run locally: bun run fmt, cd apps/web && bunx tsc --noEmit (clean), bunx oxlint on the three changed files (0 warnings/errors). Full CI validates the rest.

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Summary by cubic

Localizes the OAuth authenticate button’s default label. Previously it defaulted to the hardcoded English "Authenticate" when no buttonText was provided; now it uses the i18n key "details.settingsTab.authenticate" so pt-br and other locales render correctly.

• Add "details.settingsTab.authenticate" to apps/web/src/i18n/en/details.ts and apps/web/src/i18n/pt-br/details.ts.
• Update OAuthAuthenticationState to use t("details.settingsTab.authenticate") only when buttonText is not provided; callers that pass buttonText are unchanged.
• Verify: open a not-yet-authenticated OAuth connection’s Settings tab in pt-br; the button reads "Autenticar".

^{Written for commit e7f6d6c. Summary will update on new commits.}

[pedrofrxncx]

Closing as stale: this PR sat past the bot's 48h merge window, main has moved on, and its CI results no longer reflect the current base. This is a housekeeping close, not a rejection of the change — if the underlying problem still exists, the bot will find it again and open a fresh, rebased PR.

[studio-bot:stale-close]