Redesign Tools page UI and refine site-wide styling

- Consolidate Tools into single card with tab toggle (Capacity/EXIF/Strip)
- Remove non-functional Peek feature (requires keys due to PRNG scattering)
- Add lime green (#a3e635) tool tab styling
- Add light straw gold (#fee862) card header text site-wide
- Add subtle drop shadow to headers and warning text
- Match Tools page styling to Encode/Decode pages

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontends/web/static/style.css

@@ -16,6 +16,7 @@
     --overlay-dark: rgba(0, 0, 0, 0.3);
     --overlay-light: rgba(255, 255, 255, 0.05);
     --day-highlight: #E3FF54; /* Bright yellow/green for day of week */
+    --header-gold: #fee862; /* Halfway between light straw and 24k gold */
 }
 
 /* ----------------------------------------------------------------------------
@@ -140,6 +141,17 @@ body {
     border-bottom: none;
 }
 
+.card-header h5 {
+    color: var(--header-gold);
+    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.33);
+}
+
+/* Override small warning text to use header gold */
+.text-warning.small {
+    color: var(--header-gold) !important;
+    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.33);
+}
+
 .card-link .card-header.text-center {
     padding-top: 0.5rem !important;
     padding-bottom: 0.5rem !important;