feat(theme-studio): capture the nerd-icons filetype legend (phase 1)

Add build-nerd-icons-legend.el, which resolves the curated v1 legend rows (glyph + owner color face per filetype) from the live nerd-icons alists and dumps them to nerd-icons-legend.json, a committed artifact like package-inventory.json. generate.py gains load_nerd_icons_legend, which validates the artifact and returns None — with a warning — when it is absent, malformed, empty, or missing a field, so the page can fall back to the generic nerd-icons app rather than error. Data only; the bespoke preview that renders it lands next.

Claude-Session: https://claude.ai/code/session_01BqrdWUo9GcznYX2pZr76gZ

1 files changed, 93 insertions, 0 deletions

diff --git a/scripts/theme-studio/nerd-icons-legend.json b/scripts/theme-studio/nerd-icons-legend.json
new file mode 100644
index 000000000..1b315e98b
--- /dev/null
+++ b/scripts/theme-studio/nerd-icons-legend.json
@@ -0,0 +1,93 @@
+[
+  {
+    "key": "ext:el",
+    "label": "init.el",
+    "face": "nerd-icons-purple",
+    "category": "extension",
+    "glyph": ""
+  },
+  {
+    "key": "ext:py",
+    "label": "app.py",
+    "face": "nerd-icons-dblue",
+    "category": "extension",
+    "glyph": ""
+  },
+  {
+    "key": "ext:org",
+    "label": "notes.org",
+    "face": "nerd-icons-lgreen",
+    "category": "extension",
+    "glyph": ""
+  },
+  {
+    "key": "ext:md",
+    "label": "README.md",
+    "face": "nerd-icons-lblue",
+    "category": "extension",
+    "glyph": ""
+  },
+  {
+    "key": "ext:ts",
+    "label": "main.ts",
+    "face": "nerd-icons-blue-alt",
+    "category": "extension",
+    "glyph": "󰛦"
+  },
+  {
+    "key": "ext:html",
+    "label": "index.html",
+    "face": "nerd-icons-orange",
+    "category": "extension",
+    "glyph": ""
+  },
+  {
+    "key": "ext:rs",
+    "label": "lib.rs",
+    "face": "nerd-icons-maroon",
+    "category": "extension",
+    "glyph": ""
+  },
+  {
+    "key": "ext:js",
+    "label": "app.js",
+    "face": "nerd-icons-yellow",
+    "category": "extension",
+    "glyph": ""
+  },
+  {
+    "key": "ext:yml",
+    "label": "ci.yml",
+    "face": "nerd-icons-dyellow",
+    "category": "extension",
+    "glyph": ""
+  },
+  {
+    "key": "ext:c",
+    "label": "main.c",
+    "face": "nerd-icons-blue",
+    "category": "extension",
+    "glyph": ""
+  },
+  {
+    "key": "dir",
+    "label": "src/",
+    "face": "nerd-icons-yellow",
+    "category": "dir",
+    "glyph": ""
+  },
+  {
+    "key": "cmd",
+    "label": "M-x command",
+    "face": "nerd-icons-blue",
+    "category": "command",
+    "glyph": ""
+  },
+  {
+    "key": "buf",
+    "label": "*scratch*",
+    "face": "nerd-icons-purple",
+    "category": "buffer",
+    "glyph": ""
+  }
+]