Co-authored-by: Copilot <[email protected]>

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Copilot <[email protected]>

fix: hide thread dropdown on delete dialog confirmation popup

French Translation

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Updating localization files

* Update LanguageSwitcher.tsx

Added Russian language option

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Removing the trailing newline character

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UI Testing, Translation & Contextual QA

* feat: replace Tauri dialog plugin with rfd integration

Remove the legacy `tauri-plugin-dialog` dependency and its capability entry, adding `rfd` as a cross‑platform native file dialog library.
Introduce `open_dialog` and `save_dialog` commands that expose file‑selection and save dialogs to the frontend, along with a `DialogOpenOptions` model for filter, directory, and multiple‑file support.
Update the `TauriDialogService` to invoke these new commands instead of the removed plugin, ensuring a cleaner build and consistent dialog behaviour across desktop targets.

* chore: remove unused serde_json import

Remove the unnecessary serde_json import from `src-tauri/src/core/filesystem/commands.rs` to keep the codebase clean and eliminate unused dependencies. This small refactor improves build clarity and reduces potential lint warnings.