design: fix leftover mismatches with the mockup

[DualChimerra]

• Sidebar: trained / training versions show every step done and the train step current, as the Overview pipeline already did (was stuck on step 1).
• Train config: path fields take the full width under the name with a folder button, instead of a narrow truncated box on the side.
• Train header: "Start training" with the play icon, "project · version" config title, model name as code, network type as LoKr / LoRA.
• "Next" buttons on Dataset, Curate and Preprocess get the arrow.
• Reg subtitle shows 1_data/ as code; tools / task eyebrows uppercase.
• Presets: the first preset opens on load (the auto-select raced the schema and could leave the panel empty); long optimizer names ellipsize.
• Dialogs and bars still on the legacy .btn / .badge / .input classes now use the mockup's sizes (32 / 26 px controls, 21 px badges).
• New project dialog: no English "(optional)" in the Russian UI.