fix(themes): #52 broken/high-ROI fidelity fixes

Six per-theme defects: rose-pine btop rewritten to Dawn (was Main-on-Dawn,
invisible hi_fg); everforest + summer-night btop inactive_fg off main_bg;
vantablack role inversion (surface/overlay/muted + btop selection);
osaka-jade text↔subtext swap + warn→yellow; catppuccin-latte
mantle/accentAlt/ANSI axis; catppuccin Mocha btop (was Frappé). accentAlt
uses Latte mauve #8839ef, not the audit's pink #ea76cb (which fails the
3.0 contrast floor).

Worktree agent; diff reviewed + contrast conflict adjudicated. V0:
check-theme-contrast 24x7 all pass + flake check green. btop V2 render
pending (batched). Residual ansi[8]/ansi[3] drift noted.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

themes/vantablack.json

@@ -7,11 +7,11 @@
   "colors": {
     "base": "#0d0d0d",
     "mantle": "#0b0b0b",
-    "surface": "#0d0d0d",
-    "overlay": "#fdfdfd",
+    "surface": "#1a1a1a",
+    "overlay": "#2a2a2a",
     "text": "#ffffff",
     "subtext": "#ececec",
-    "muted": "#fdfdfd",
+    "muted": "#666666",
     "accent": "#8d8d8d",
     "accentAlt": "#9b9b9b",
     "good": "#b6b6b6",