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.

migrations/013_print_presets.sql

@@ -1,4 +1,4 @@
--- Druckbogen-Vorlagen („Kita-Satz Felix", „8× Passbild") -------------------
+-- Vorlagen für Passbilder/Druckbogen („Kita-Satz", „8× Passbild") ----------
 CREATE TABLE IF NOT EXISTS print_presets (
   id         uuid PRIMARY KEY DEFAULT gen_random_uuid(),
   name       text NOT NULL,