add colors.toml and 0x-hex support, rescuing 44 more community themes

Poked at the 62 "no parseable source" skips from the first pass and found two things
the pipeline didn't handle: several community repos genuinely ship colors.toml too — some
in Omarchy 4's own semantic schema (best case, no derivation needed at all, same quality
as the official 22), others reusing the filename for an unrelated flat color0..color15
scheme — and a handful of alacritty.toml files use 0xrrggbb instead of #rrggbb.

palette.ts's loadPalette is now a thin wrapper over two exported pieces (parseTomlText,
paletteFromRecord) so the community pipeline can attempt the real schema first without
duplicating the reader; falls through to the color16 or ANSI-derived paths otherwise.
generate-themes.ts --check still reports 0 changes for the official set — the refactor
is behavior-preserving there, the lowercase-hex normalization it picked up along the way
touched 7 official theme files cosmetically (their source colors.toml has uppercase hex),
regenerated for real rather than left inconsistent with their own source.

147 -> 191 community themes ported. Of the original 62 unparseable repos, most turned out
to be simply gone (404 on GitHub — repos deleted or renamed since the site listed them);
the rest needed one of the two format additions above. 20 themes remain stuck: 16 dead
repos, 2 with no repo link at all, and the same handful of genuinely low-contrast source
palettes (mostly Solarized variants) where fixing contrast would mean changing the
author's actual colours rather than porting them.

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

scripts/themes/palette.ts

@@ -38,21 +38,28 @@ export type Palette = {
   brightMagenta: string;
 };
 
-/** A deliberately small TOML reader: this file is flat `key = "value"` and nothing else. */
-function readToml(path: string): Record<string, string> {
+/**
+ * A deliberately small TOML reader: this file is flat `key = "value"` and nothing else.
+ *
+ * Exported (not just used by `loadPalette` below) because a community theme can ship this exact shape
+ * too — see `port-community-themes.ts`, which reads it from a fetched string rather than a file path.
+ */
+export function parseTomlText(text: string): Record<string, string> {
   const out: Record<string, string> = {};
-  for (const line of readFileSync(path, 'utf8').split('\n')) {
+  for (const line of text.split('\n')) {
     const m = line.match(/^\s*([a-z_0-9]+)\s*=\s*"([^"]*)"/i);
-    if (m) out[m[1]!] = m[2]!;
+    // basecamp/omarchy's own files are already lowercase hex; a community `colors.toml` isn't guaranteed
+    // to be, so normalize here rather than leaving the two sources visibly inconsistent.
+    if (m) out[m[1]!] = m[2]!.toLowerCase();
   }
   return out;
 }
 
-export function loadPalette(tomlPath: string): Palette {
-  const t = readToml(tomlPath);
+/** The 24-key contract, given an already-parsed record rather than a path — see `parseTomlText`. */
+export function paletteFromRecord(t: Record<string, string>, label: string): Palette {
   const need = (key: string): string => {
     const v = t[key];
-    if (!v) throw new Error(`${tomlPath}: missing "${key}"`);
+    if (!v) throw new Error(`${label}: missing "${key}"`);
     return v;
   };
 
@@ -84,3 +91,7 @@ export function loadPalette(tomlPath: string): Palette {
     brightMagenta: need('bright_magenta'),
   };
 }
+
+export function loadPalette(tomlPath: string): Palette {
+  return paletteFromRecord(parseTomlText(readFileSync(tomlPath, 'utf8')), tomlPath);
+}