fix: include txt/pdf raw sources in queue, match dark accent to theme

- readPipeline no longer filters raw/sources to .md only; CLAUDE.md
  documents txt and pdf as valid raw source types, and hiding them from
  the queue silently was the same invisibility bug the dashboard exists
  to remove.
- Dark-mode accent now tracks the installed tesanti theme (same signal
  red, no base-color lift) instead of contradicting it; status colors
  (ok/warn/danger) keep their lifted dark values for AA contrast on
  small text, per design-system separation of status tokens from the
  brand accent.

.obsidian/plugins/webinar-dash/styles.css

@@ -40,12 +40,19 @@
   --wd-border: var(--wd-ink-700);
   --wd-border-strong: #b8b8b8;
   --wd-border-subtle: #161616;
-  --wd-accent: #ff4a3d;
-  --wd-accent-press: #ff6d62;
-  --wd-accent-on: #0a0a0a;
+  /* Accent tracks the installed theme at .obsidian/themes/tesanti/theme.css,
+     whose dark section reads "Black canvas, same signal red": --accent-h/-s/-l
+     are declared once at :root and never redeclared under .theme-dark, and only
+     the hover state lifts (#c31c14 light, #ff4d43 dark). Match that exactly. */
+  --wd-accent: var(--wd-red-500);
+  --wd-accent-press: #ff4d43;
+  --wd-accent-on: #ffffff;
+  /* Status tokens are separate from the brand accent by design-system rule, and
+     here they carry small text in a dense table. #e1261c on near-black is about
+     3.8:1, under AA for small text, so these lift where the accent does not. */
   --wd-ok: #2fbf6a;
   --wd-warn: #e0a516;
-  --wd-danger: #ff4a3d;
+  --wd-danger: #ff5c50;
 }
 
 @media (max-width: 820px) {