feat: redesign encoder progress display

[AsPulse]

Rework the ffmpeg encoder's progress display so each piece of live information has its own row and visual weight. Previously size and bitrate were tacked on as a prefix on the Encode line; now they sit on a dedicated third row.

• Three rows: Render bar (rendered frames), Encode bar (ffmpeg frame=), and a text-only row with size @ bitrate from ffmpeg's total_size= / bitrate=.
• Truecolor styling mirrors ~/dotfiles/public/claude/statusline in three tiers: label color (GREEN / ORANGE) for the label, filled bar segment, and live counters (pos, percent); default white for eta / elapsed; medium-grey MUTED for the unfilled bar, separators, the total count, and the @.
• Bar fills the terminal width: a custom with_key key reads console::Term::stdout().size_checked() and subtracts the rest of the template plus a 2-column margin on each side. console is now a direct dep.
• Time shown as eta > elapsed in zero-padded HH:MM:SS (remaining first).