[guplem]

Both PDF exports get a clearer layout, and no information is lost. Every value of the old PDFs is still printed. A human approved the design from before/after previews built with the bundled default recipes and menu.

Menu PDF

• Each week starts on its own page. Before, week 2 broke in the middle of its table.
• A cook note ("2p · cook 6 servings") is bold teal, and a leftovers note is gray italic. A legend under the title explains both.
• The recipes start on a new page. Each recipe shows its facts as chips (servings, total time, work time, cooking time) and its ingredients in a two-column grid with the amounts aligned on the right.
• Each step shows a bold teal number, then its times, then the ingredients that it uses.

Shopping PDF

• Each trip starts on its own page, with a banner such as "Trip 1 of 3: now · 65 items".
• Each ingredient has a box to tick, a bold name, and the amount on the right.
• Product rows start with the packs to buy. The best product has a green "Recommended" badge. "Freeze on arrival" is a blue badge.
• "Needed for" is a small striped table with three columns: when, dish, and amount.
• An ingredient with no store product says so. A line under the title explains how to use the page in the shop.

Both

• New lib/theme/pdf_theme.dart holds the shared colors (the teal of the app seed color), the page, a "Page X of Y" footer, a section banner and a badge.
• The PDF text reader of the tests moves to test/helpers/pdf_bytes_reader.dart, so the menu tests can count pages and read drawn text too.

Tests

• Red-green TDD for every new text function and for the page breaks. I reverted each page break once, and only the matching test failed.
• 1050 tests pass, flutter analyze is clean, and the format check passes.

Out of scope

• The built-in PDF font cannot draw characters outside Latin-1 (for example € or ½). A bundled font would fix this, but the tests read drawn text in a way that only works with the built-in font. This needs its own PR.
• The shopping PDF already listed only the week-1 meals under a long-life item that trip 1 buys for several weeks (for example 28 eggs bought, 8 listed). This PR does not change that. It needs its own fix.

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