feat(files): auto-accept setting for incoming files, on both devices

[X-Ryl669]

Receiving a file batch always prompted — a desktop banner on the laptop, a notification on the phone — with no way to say "I trust this device, stop asking me".

Add an independent switch on each device, each governing the direction that device receives in: the laptop's covers phone→laptop, the phone's covers laptop→phone. Deliberately NOT one setting synced across the link — trusting files onto a laptop and onto a phone are separate decisions, and coupling them would let one choice silently widen the other.

Both default to OFF. This removes a consent gate, so it only ever turns on because the user asked for it; on the laptop an unreadable or unrecognised state file also reads as OFF, so a missing or corrupt file can never be the reason everything gets accepted.

Laptop: file_consent::request() returns immediately when the setting is on, so no banner is posted and the sender isn't left waiting out the 45 s consent timeout. Persisted in ~/.local/share/vortex/file_auto_accept (the convention voice_settings and universal_control already use) rather than living in memory like the clipboard-sync toggle: a consent setting that silently reverted on restart would leave the user believing files are still gated when they are not, or waiting for a prompt that no longer comes. The setter forces the lazy load first, so a later load cannot clobber the choice, and the UI switch reverts if the write fails rather than showing "on" over a setting that didn't stick.

Phone: FileAutoAcceptSetting mirrors ClipboardSyncSetting (StateFlow over the same vortex_ui_settings prefs) and FileConsent.request() short-circuits on it, with an idempotent init at that call site as well as at service start — an offer arriving before the UI was ever opened is still answered from the user's real choice, not from a default.

Strings added for all three locales (en/ru/uz) on both sides, keyed identically across Strings.kt and src/lib/locales as the two UIs expect. The ru/uz wording has not been checked by a native speaker.

With auto-accept on, the transfer pill stays the only signal — deliberately: a confirmation toast would reintroduce the interruption the setting exists to remove.

Authored by Claude.