Swap calendar coloring to per-person keyword match; teal UI accent

- Events now color by name match in the summary: Becca=teal, Chris=green,
  Arabella=pink. Anything without a match gets a neutral slate. Replaces
  the hash-to-Google-palette logic.
- Main accent swapped from blue to pastel teal (#14b8a6) so the UI feels
  cohesive with the event palette.

tailwind.config.js

@@ -18,11 +18,11 @@ module.exports = {
           border: '#e2e8f0',        // cool soft border
           'border-light': '#cbd5e1',
         },
-        // Blue accent
+        // Cool pastel teal accent (picks up Becca's event color)
         accent: {
-          DEFAULT: '#3b82f6',       // blue-500
-          light: '#60a5fa',
-          dark: '#2563eb',
+          DEFAULT: '#14b8a6',       // teal-500
+          light: '#5eead4',         // teal-300
+          dark: '#0d9488',          // teal-600
         },
         // Cool slate ink text scale
         ink: {