feat: all AI formats printable, crop-vs-border rule, mobile layout, Passbilder rename

Print now offers every format the AI pipeline knows (9x13 to 60x90, DIN A6-A2,
squares, poster/frame sizes to 70x100, and the screen ratios as physical sizes).
When a picture does not match the target ratio the user picks per image between
cropping to fill and keeping the whole picture on a border colour - never a
stretch. The module is called Passbilder now; /druck redirects.

Fixes two real defects: sharp runs extend after resize, so padded cells came out
oversized (a 35x45 mm cell became 35x171 mm with a border), and the grid packer
rotated a single portrait photo just because more would fit sideways.

Mobile: cards become rows, touch targets ~40px, crop editor as a bottom sheet.
Verified at 390/820/1440px - all three produce the same PDF.

CHANGELOG.md

@@ -2,6 +2,32 @@
 
 All notable changes to Klarbild are documented here. Newest first.
 
+## 2026-08-18 (2) — Passbildfunktion: all sizes, fit rules, mobile
+
+### Added
+- **Renamed to "Passbilder"** — the tab, page and Telegram button now say what it is.
+  `/druck` permanently redirects to `/passbilder`.
+- **Every size the AI pipeline knows** is now printable too: 9×13 … 60×90, DIN A6–A2,
+  squares, plus poster/frame sizes up to 70×100 and the screen ratios (16:9 "The Frame",
+  9:16, 3:2, 4:3, 5:4) as physical measurements. 41 presets in seven groups.
+- **Fit rule per image** — when the picture does not match the target ratio, choose
+  **Zuschneiden** (fill the format, crop the overflow — default) or **Rand lassen**
+  (keep the whole picture, pad with a border colour: white, black, paper or custom).
+  Nothing is ever distorted. Works in the crop editor, the sheet preview, the PDF,
+  `/api/print/*` (`fit`, `bg`) and the saved templates.
+- **Mobile layout** — image cards become a row on phones, touch targets grow to ~40 px,
+  the crop editor turns into a full-width bottom sheet, no horizontal overflow.
+  Verified at 390 / 820 / 1440 px; all three produce the identical PDF.
+
+### Fixed
+- **Sheet cells could come out oversized.** sharp applies `extend` *after* `resize`, so
+  padding was added on top of the finished size — a 35×45 mm cell became 35×171 mm in
+  "Rand lassen" mode, and bleed near an image edge was off too. Crop and padding now run
+  in their own pass. Covered by `tests/printrender.test.ts`.
+- **Orientation is no longer overridden.** A single portrait passport photo was laid down
+  sideways just because more would fit that way. Rotation now only happens when it
+  actually saves a sheet.
+
 ## 2026-08-18 — Print module: exact sizes, sheets & crop marks (no AI)
 
 ### Added