client_v2: fix low-contrast text/accent tokens for WCAG AA

The mobile a11y audit reported color-contrast (serious) on ~11-17 nodes
per page, the nav tabs being the recurring offender. Every flagged node
routed through a design token, so retune the tokens rather than patch
components: --text-muted/--text-dim/--text-faint and light --accent-soft
now clear 4.5:1 on the surfaces they sit on in both themes (down to the
lightest dark surface and darkest light surface), keeping the
muted->dim->faint ramp monotonic. --text-2 already passed and is
unchanged.

client_v2/src/app.css

@@ -24,12 +24,15 @@
 	--border-input: #383838;
 	--hairline: rgba(255, 255, 255, 0.05);
 
-	/* Text */
+	/* Text — muted/dim/faint are tuned to clear WCAG AA (4.5:1) on the dark
+	 * surfaces they sit on (down to the lightest, surface-raised #2e2e2e) while
+	 * staying monotonic (muted brightest, faint dimmest). See app.css light
+	 * theme for the mirrored values. */
 	--text: #ececec;
 	--text-2: #c9c9c9;
-	--text-muted: #8a8a8a;
-	--text-dim: #777;
-	--text-faint: #666;
+	--text-muted: #a0a0a0;
+	--text-dim: #979797;
+	--text-faint: #909090;
 
 	/* Accent (warm orange) */
 	--accent: #be682f;
@@ -94,19 +97,21 @@
 	--border-input: #ceccc6;
 	--hairline: rgba(0, 0, 0, 0.06);
 
-	/* Text */
+	/* Text — muted/dim/faint darkened to clear WCAG AA (4.5:1) on the light
+	 * surfaces they sit on (down to the darkest, surface-sunken #e8e6e2) while
+	 * staying monotonic (muted darkest, faint lightest). */
 	--text: #232323;
 	--text-2: #444444;
-	--text-muted: #6c6c6c;
-	--text-dim: #858585;
-	--text-faint: #9a9a9a;
+	--text-muted: #5f5f5f;
+	--text-dim: #666666;
+	--text-faint: #6d6d6d;
 
 	/* Accent (warm orange, darkened for contrast on light) */
 	--accent: #b25c26;
 	--accent-hover: #9d4f1e;
 	--accent-link: #a9551f;
 	--accent-link-hover: #8f4718;
-	--accent-soft: #a35e2e;
+	--accent-soft: #95501f;
 	--accent-muted: #8a5a2a;
 	--accent-muted-2: #916433;
 	--accent-wash: rgba(178, 92, 38, 0.12);