feat(ui): app icons on the house canvas; detail page gets the tile treatment

- alby-hub + phoenixd icons re-set with the standard 12% inner margin
  (they shipped edge-to-edge; every other icon carries whitespace).
- scripts/normalize-app-icon.py: wraps any third-party SVG mark onto the
  house canvas — the system applies the tile plate (archy-app-icon)
  automatically but deliberately no runtime inset, so the margin must be
  baked; the guide now says exactly that.
- MarketplaceAppDetails: the icon now carries archy-app-icon like the
  store tiles — the treatment no longer stops at the detail page.
- v1.8.2 changelog: third curated bullet (the ceremony gate requires 3).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/public/assets/img/app-icons/phoenixd.svg

@@ -1,7 +1,11 @@
-<?xml version="1.0" encoding="utf-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
+  <!-- normalized by scripts/normalize-app-icon.py: margin=0.12 per side -->
+  <svg x="12.000" y="12.000" width="76.000" height="76.000" viewBox="0 0 94 94" preserveAspectRatio="xMidYMid meet">
 <svg viewBox="0 0 94 94" id="vector" xmlns="http://www.w3.org/2000/svg">
   <g id="group" transform="matrix(1, 0, 0, 1, -6.999915, -7)">
     <path id="path" d="M 30 81 C 23 80 21.63 71.49 29.16 45.87 C 35 26 46.18 26 58 26 C 73.17 26 81.61 29.18 83.79 35.73 C 84.243 36.883 84.39 38.135 84.214 39.362 C 84.039 40.589 83.548 41.75 82.79 42.73 C 82.613 42.96 82.419 43.178 82.21 43.38 C 85.1 45.31 86.88 48.02 86.52 51.9 C 86.13 56.26 83.16 58.55 78.52 59.66 C 78.849 60.396 79.013 61.194 79 62 C 78.988 63.199 78.695 64.378 78.147 65.444 C 77.598 66.51 76.808 67.433 75.84 68.14 C 70.09 72.76 60 75 46 73 C 43 72.57 41 75 39 77 C 36.62 79.38 34.24 81.61 30 81 Z" fill="#25A5FF"/>
     <path id="path_1" d="M 58 30 C 66 30 78 31 80 37 C 82.24 43.71 69 43 59 42 C 68 43 83.18 44 82.5 51.5 C 82 57 72 57 55 56 C 63 57 75 58 75 62 C 75 68.28 58.74 71 47.67 69.31 C 39 68 38.06 76.77 31 75 C 27 74 28 63 33 47 C 38.29 30.09 46.49 30 58 30 Z" fill="#ffffff" stroke="#25A5FF" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
   </g>
-</svg>
+</svg>
+  </svg>
+</svg>