Statistics: dashboard view with tiles, meters, checks and CPS histogram

[niksedk]

Implements the Statistics dashboard concept preview.

The window previously printed three plain-text blocks; it now shows the same numbers as a dashboard:

• KPI tiles — subtitles, words, characters (text only), total duration.
• Timing and pacing — min/avg/max meter rows (subtitle length, duration, chars/sec, words/min, gap) with the average marked as a dot on the min–max span.
• Checks — the profile-rule counters (above max/optimal CPS, above max WPM, duration below min/above max, line too long/too wide, gap below min) with severity colors and icons; a zero count renders as a green check. Severity tones match the batch convert status badges.
• Chars/sec histogram — distribution in 2-CPS bins with dashed lines at the profile's optimal/maximum CPS, per-bar tooltips with exact counts.
• Most used words — top 8 as ranked bars with direct labels; Most used lines — top 8 with count pills.

Notes:

• Export... is unchanged — the plain-text report is still generated and written as before.
• The line-too-wide check and the gap rows only appear when applicable (wide-line coloring enabled / more than one line), same conditions as the old text.
• Adds ~16 short LanguageStatistics tags (card headers, KPI labels, check labels) with English defaults; existing tags cover the rest.
• All layout is plain panels/borders — no charting dependency.

I could not run the GUI from here, so please give it a visual once-over (dark + light, and a subtitle with overlaps so a negative minimum gap shows up).

🤖 Generated with Claude Code