feat: rename to Drucken, 86 image sizes, fix the distorted crop editor

The crop frame had width:100% together with max-height, so the height was
clamped while the width stayed - the frame lost the target aspect ratio and
object-fit:fill stretched the picture into it. Measured at 390px: frame 0.843
instead of 0.778, picture 8.3% too wide. The width now follows from the allowed
height and the ratio, and the image carries its own aspect-ratio instead of a
second percentage, so it cannot stretch at all.

Dragging was fine but felt dead: at fill zoom the crop sits at the stop in one
axis. The editor now states which way it can move, double-tap zooms, arrow keys
nudge, and the zoom slider shows its factor.

Sizes: 41 -> 86 in ten groups, including US inch sizes, instant-film picture
areas, cards, DIN A0-A7 and eleven aspect ratios as physical sizes.

The tab is called Drucken now; /druck and /passbilder redirect there.

CHANGELOG.md

@@ -2,6 +2,31 @@
 
 All notable changes to Klarbild are documented here. Newest first.
 
+## 2026-08-18 (4) — Renamed to "Drucken", 86 sizes, crop editor fixed
+
+### Fixed
+- **The crop editor distorted the picture.** `.crop-box` had `width:100%` *and*
+  `max-height`, so the height was clamped while the width stayed put — the frame no
+  longer had the target aspect ratio, and `object-fit:fill` stretched the image into it.
+  Measured on a 390 px viewport: frame 0.843 instead of 0.778, picture **8.3 % too wide**.
+  The frame width is now derived from the allowed height and the ratio, and the image
+  carries its own `aspect-ratio` instead of a second percentage — it can no longer stretch,
+  even if the frame is ever off.
+- **Dragging felt broken.** At "fill" zoom the crop sits exactly at the stop in one axis,
+  so pulling that way does nothing — correct, but invisible. The editor now says which way
+  the picture can move, double-click/double-tap zooms a step, arrow keys nudge (shift for
+  bigger steps), and the zoom slider shows its factor.
+
+### Changed
+- **Renamed to "Drucken"** — the tab, page, title and Telegram button. `/druck` and
+  `/passbilder` both redirect permanently to `/drucken`.
+- **86 image sizes in ten groups** (was 41): passport formats per country, cm small sizes,
+  classic photo sizes, **US inch sizes** (wallet to 24 × 36), **instant-film picture areas**
+  (Instax mini/Square/Wide, Polaroid), poster and frame sizes up to 100 × 140, squares,
+  **DIN A0–A7 incl. A3+**, cards (business card, postcard, DIN lang, cheque card) and
+  aspect ratios as physical sizes (16:9, 9:16, 21:9, 2:1, 3:2, 2:3, 4:3, 3:4, 5:4, 4:5, 1:1).
+- Paper list grew to 19: DIN A1, square photo paper, and the US inch cuts.
+
 ## 2026-08-18 (3) — Code review: fixes
 
 ### Fixed