Add Ledger and Band template families with decor primitives

Crimson Grid, Tangerine Ledger, Slate Band and Teal Swoosh are rebuilt from
the reference PDFs with grid and band tables that survive page breaks,
full-bleed fixed bands, pennant tabs, gradient corner swooshes with
keep-outs, Carbon icon circles, and the user's logo in the measured slot
(knockout or white chip on the dark Slate band). Adds static Poppins
500-700 and Inter fonts. Thumbnails regenerated for all eight templates;
the item-count sweeps run in their own test file.

docs/templates/11-tangerine-ledger.md

@@ -173,3 +173,17 @@ Near-duplicate of 7.pdf. Both carry the same 'Studio Shodwe' content and the sam
 Differences: 7.pdf uses Poppins for body text, a dark-red accent, a flame logo at top-right, a red rule under the header and a full-width red contact footer band. 11.pdf uses Inter body, #FF5F2F, brand text at left and edge tabs.
 
 Build one 'Ledger Grid' component with an accent colour and a decor variant (tabs or footer band). Of 10–13, this is structurally closest to the current in-app template. Unrelated to format.pdf.
+
+## Implementation notes
+
+Built as `src/pdf/templates/ledger/` (the family component shared with Crimson Grid; tokens in `tangerine.tsx`) on the decor primitives in `src/pdf/decor/` (`Pennant`). Measured against `11.pdf` with `npm run templates:compare` (`/tmp/invoice-c4/compare-tangerine-ledger.png`, left reference, right ours).
+
+**Matches the design (measured, A4):** INVOICE baseline 80.6 pt, right edge on the content edge (536.7), Poppins Bold 33; 'Invoice Number' / 'Invoice Date' baselines 168.6 / 187.3 (reference 168.7 / 187.4); party headings at x 59.5 and 284.1, 23.9 pt above the first line; table header and row pitch (header 41.5 pt single-line incl. rules, rows 37.5); accent #FF5F2F header, filled Total row with white separators; both pennant tabs at the design's coordinates.
+
+**Intentional deviations, and why:**
+- **Margins.** Top 46 pt: Poppins's tall ascent puts the 33 pt title's box top 11.5 pt above the cap top, so the box (not the ink) starts at the margin. Sides 59.55 with a floor of 45 on every preset, so Narrow (36) never puts text under the 35 pt tabs. Bottom 60 + 16 footer reserve.
+- **Header.** The brand zone is the measured 220 x 36 allowance at y 62-98. A wordmark logo replaces the 'Rimberio' text; a mark logo sits left of the vendor name in Poppins Bold 18; without a logo the name stands in. The brand block is at most half the content width, the title shrinks to at most 60 % before it would meet it.
+- **Tabs.** Two static Svg paths anchored to the page corners (top right 35.1 x 230.5, bottom left 35.3 x 218.6), fixed on every page; the reference paths are simplified to their visible part with the same curves. They keep their size on Letter.
+- **Meta, parties, table, totals, notes, closing, elastic gaps:** as for Crimson Grid (docs/templates/07-crimson-grid.md), with Tangerine's own numbers: meta gap 59 to 32, party 20.8 to 12, table 25.4 to 14, totals 23.3 to 10 (64 pt of slack on Letter), cell padX 9.8, padY 10.8, totals box at least 205 pt. The Total row is filled with the accent (white 12 pt Inter Bold, white separator).
+- **Type.** Poppins 700 for brand and title, Inter 400/600/700 for the rest (static TTFs; Inter and Poppins both carry U+20B9, Plex still ends every stack). Inter's strongly kerned pairs ('7,', '7.') make pdf.js report an amount as two text items; the text is unchanged and the harness joins such fragments before checking the rupee sign.
+- **Footer.** The standard footer (supplier name, 'Generated with Voiced', Page n of N) at 7 pt in grey; the design has none. The left tab (x 0-35.3) clears the footer at x 59.5 by 24 pt.