Drop WooCommerce's brand purple from the plugin icon

assets/icon.svg filled the badge, the envelope fold and the percent sign with
#7f54b3 — WooCommerce's own brand colour. Caught by the odin session during the
trademark review.

The point of taking "Woo" out of the plugin names was to stop implying an
official tie to Automattic. A mark that keeps their purple says visually
exactly what the rename stops saying, and a colour is harder to defend as
coincidence than a name. It is wrong independently of what the family palette
ends up being, so it does not wait for that decision.

#1a7a52 chosen to match the old colour's WEIGHT rather than merely to differ
from it: 5.32:1 on white against the purple's 5.50:1, so the white envelope and
badge keep the contrast the proportions were tuned for at 40px — the size
WordPress renders this at on Dashboard → Updates. Green also reads as savings.

The hex of the colour being avoided is written broken up in the comment
(7f-54-b3). A palette check across the five plugins would otherwise match this
explanation and report the icon as still carrying it — the same self-matching
trap the credential scan hit earlier today, when the rule flagged its own
documentation.

Not included, because it belongs to the rename and that is still Kristian's
decision: the aria-label still reads "WooCommerce Email Discount Manager",
which is the plugin's actual name today.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/icon.svg

@@ -1,16 +1,29 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128" width="128" height="128" role="img" aria-label="WooCommerce Email Discount Manager">
-  <!-- Drawn as paths, never as <text>: an SVG that leans on a font renders
+  <!-- #1a7a52, and deliberately NOT WooCommerce's own brand purple (hex
+       7f-54-b3, written broken up on purpose so a palette check cannot
+       mistake this explanation for a use of it).
+       The whole point of dropping "Woo" from the plugin name was to stop
+       implying an official tie to Automattic, and a mark that keeps their
+       purple says visually exactly what the rename stopped saying — a colour
+       is harder to defend as coincidence than a name. Green also reads as
+       savings, which is what this plugin does.
+
+       Chosen to match the old colour's WEIGHT, not just to differ from it:
+       5.32:1 on white against the purple's 5.50:1, so the badge and the
+       envelope keep the same contrast at the size below.
+
+       Drawn as paths, never as <text>: an SVG that leans on a font renders
        differently on every machine that opens it, and WordPress shows this at
        roughly 40px on Dashboard → Updates — the size where that is the
        difference between a mark and a smudge. The proportions are tuned at
        40px, not at 128: the badge is deliberately oversized so the percent
        sign survives being shrunk to a dozen pixels. -->
-  <rect width="128" height="128" rx="28" fill="#7f54b3"/>
+  <rect width="128" height="128" rx="28" fill="#1a7a52"/>
   <rect x="13" y="30" width="74" height="52" rx="7" fill="#ffffff"/>
-  <path d="M13 36 L50 62 L87 36" fill="none" stroke="#7f54b3" stroke-width="7"
+  <path d="M13 36 L50 62 L87 36" fill="none" stroke="#1a7a52" stroke-width="7"
         stroke-linecap="round" stroke-linejoin="round"/>
   <circle cx="90" cy="90" r="32" fill="#ffffff"/>
-  <g stroke="#7f54b3" stroke-width="6" fill="none" stroke-linecap="round">
+  <g stroke="#1a7a52" stroke-width="6" fill="none" stroke-linecap="round">
     <circle cx="80" cy="80" r="6"/>
     <circle cx="100" cy="100" r="6"/>
     <path d="M76 104 L104 76"/>