refactor(decks): extract format utils and create modal (Brief 1)

Add shared deck format helpers and DecksCreateModal; decks page keeps
the edit modal inline for Brief 2.

Co-authored-by: Cursor <cursoragent@cursor.com>

components/DecksCreateModal.js

@@ -0,0 +1,81 @@
+import { Modal, Input, Button } from './ui';
+import { DECK_INPUT_FIELD_CLASS } from '../lib/deck-format-utils.js';
+
+export default function DecksCreateModal({
+  isOpen,
+  onClose,
+  newDeck,
+  setNewDeck,
+  onCreate,
+}) {
+  return (
+    <Modal open={isOpen} onClose={onClose} title="Create New Deck" size="md">
+      <form onSubmit={onCreate} className="space-y-4">
+        <Input
+          label="Deck Name *"
+          required
+          value={newDeck.name}
+          onChange={(e) => setNewDeck({ ...newDeck, name: e.target.value })}
+          placeholder="Enter deck name"
+        />
+        <div>
+          <label
+            className="block text-sm font-medium mb-2"
+            style={{ color: 'var(--text-primary)' }}
+            htmlFor="create-deck-format"
+          >
+            Format
+          </label>
+          <select
+            id="create-deck-format"
+            value={newDeck.format}
+            onChange={(e) => setNewDeck({ ...newDeck, format: e.target.value })}
+            className={DECK_INPUT_FIELD_CLASS}
+          >
+            <option value="Commander">Commander</option>
+            <option value="Standard">Standard</option>
+            <option value="Modern">Modern</option>
+            <option value="Legacy">Legacy</option>
+          </select>
+        </div>
+        <div>
+          <label
+            className="block text-sm font-medium mb-2"
+            style={{ color: 'var(--text-primary)' }}
+            htmlFor="create-deck-description"
+          >
+            Description
+          </label>
+          <textarea
+            id="create-deck-description"
+            value={newDeck.description}
+            onChange={(e) => setNewDeck({ ...newDeck, description: e.target.value })}
+            className={DECK_INPUT_FIELD_CLASS}
+            rows="3"
+            placeholder="Describe your deck strategy..."
+          />
+        </div>
+        <label className="flex items-center">
+          <input
+            type="checkbox"
+            checked={newDeck.is_public}
+            onChange={(e) => setNewDeck({ ...newDeck, is_public: e.target.checked })}
+            className="mr-2"
+            style={{ accentColor: 'var(--accent-ember)' }}
+          />
+          <span className="text-sm" style={{ color: 'var(--text-secondary)' }}>
+            Make deck public
+          </span>
+        </label>
+        <div className="flex space-x-3 pt-2">
+          <Button type="button" variant="secondary" onClick={onClose} className="flex-1">
+            Cancel
+          </Button>
+          <Button type="submit" variant="primary" className="flex-1">
+            Create Deck
+          </Button>
+        </div>
+      </form>
+    </Modal>
+  );
+}

lib/deck-format-utils.js

@@ -0,0 +1,23 @@
+export const DECK_FORMAT_OPTIONS = ['Commander', 'Standard', 'Modern', 'Legacy'];
+
+export const DECK_INPUT_FIELD_CLASS = 'input-field w-full';
+
+export const DECK_FORMAT_BADGE_STYLE = {
+  backgroundColor: 'var(--bg-tertiary)',
+  color: 'var(--text-primary)',
+};
+
+export function getDeckFormatIcon(format) {
+  switch (format) {
+    case 'Commander':
+      return '⚔️';
+    case 'Standard':
+      return '🏆';
+    case 'Modern':
+      return '🔥';
+    case 'Legacy':
+      return '💎';
+    default:
+      return '🃏';
+  }
+}

pages/decks.js

@@ -2,7 +2,9 @@ import { useState, useEffect } from 'react';
 import { useRouter } from 'next/router';
 import Link from 'next/link';
 import Layout from '../components/Layout';
+import DecksCreateModal from '../components/DecksCreateModal';
 import { Modal, Input, Button } from '../components/ui';
+import { DECK_FORMAT_BADGE_STYLE, DECK_INPUT_FIELD_CLASS, getDeckFormatIcon } from '../lib/deck-format-utils.js';
 import { useAuth } from '../lib/use-auth';
 
 /* 2026-06-04 design-sweep pass: the Tailwind token classes that this
@@ -132,39 +134,6 @@ export default function Decks() {
     }
   };
 
-  const getFormatIcon = (format) => {
-    switch (format) {
-      case 'Commander': return '⚔️';
-      case 'Standard':  return '🏆';
-      case 'Modern':    return '🔥';
-      case 'Legacy':    return '💎';
-      default:          return '🃏';
-    }
-  };
-
-  // Single neutral chip style for format badges — the prior
-  // getFormatColor() returned 5 stale Tailwind colour pairs
-  // (bg-purple-100, bg-blue-100, etc.) that don't fit the
-  // Deck Hearth palette and don't render in dark theme anyway.
-  const formatBadgeStyle = {
-    backgroundColor: 'var(--bg-tertiary)',
-    color: 'var(--text-primary)',
-  };
-
-  // Reusable inline-style for the .card surfaces used as stat
-  // cards + deck cards. We can't use the .glass-panel class +
-  // rounded-xl directly because we want the same gradient-border
-  // catch-light effect that the chrome chips have, and inline
-  // styles for that pattern are verbose. Easiest path: opt into
-  // the existing .glass-panel class for the multi-layer bg, then
-  // override border-radius via className. (.glass-panel doesn't
-  // set border-radius so we control it via Tailwind.)
-  const chipBgStyle = {};
-
-  // textarea / select use .input-field which is the Deck-Hearth
-  // standard input class (rounded-2xl + ember focus ring).
-  const inputFieldClass = 'input-field w-full';
-
   if (!user) {
     return (
       <Layout user={user}>
@@ -215,7 +184,7 @@ export default function Decks() {
 
         {/* Stats */}
         <div className="grid grid-cols-1 md:grid-cols-4 gap-6 mb-8">
-          <div className="glass-panel rounded-2xl p-6" style={chipBgStyle}>
+          <div className="glass-panel rounded-2xl p-6">
             <div className="text-2xl font-bold" style={{ color: 'var(--text-primary)' }}>
               {decks.length}
             </div>
@@ -261,10 +230,10 @@ export default function Decks() {
               <div key={deck.id} className="glass-panel rounded-2xl p-6 transition-shadow">
                 <div className="flex justify-between items-start mb-4">
                   <div className="flex items-center space-x-2">
-                    <span className="text-2xl">{getFormatIcon(deck.format)}</span>
+                    <span className="text-2xl">{getDeckFormatIcon(deck.format)}</span>
                     <span
                       className="px-2 py-1 rounded-full text-xs font-medium"
-                      style={formatBadgeStyle}
+                      style={DECK_FORMAT_BADGE_STYLE}
                     >
                       {deck.format}
                     </span>
@@ -329,84 +298,13 @@ export default function Decks() {
           </div>
         )}
 
-        <Modal
-          open={showCreateModal}
+        <DecksCreateModal
+          isOpen={showCreateModal}
           onClose={() => setShowCreateModal(false)}
-          title="Create New Deck"
-          size="md"
-        >
-          <form onSubmit={handleCreateDeck} className="space-y-4">
-            <Input
-              label="Deck Name *"
-              required
-              value={newDeck.name}
-              onChange={(e) => setNewDeck({ ...newDeck, name: e.target.value })}
-              placeholder="Enter deck name"
+          newDeck={newDeck}
+          setNewDeck={setNewDeck}
+          onCreate={handleCreateDeck}
         />
-            <div>
-              <label
-                className="block text-sm font-medium mb-2"
-                style={{ color: 'var(--text-primary)' }}
-                htmlFor="create-deck-format"
-              >
-                Format
-              </label>
-              <select
-                id="create-deck-format"
-                value={newDeck.format}
-                onChange={(e) => setNewDeck({ ...newDeck, format: e.target.value })}
-                className={inputFieldClass}
-              >
-                <option value="Commander">Commander</option>
-                <option value="Standard">Standard</option>
-                <option value="Modern">Modern</option>
-                <option value="Legacy">Legacy</option>
-              </select>
-            </div>
-            <div>
-              <label
-                className="block text-sm font-medium mb-2"
-                style={{ color: 'var(--text-primary)' }}
-                htmlFor="create-deck-description"
-              >
-                Description
-              </label>
-              <textarea
-                id="create-deck-description"
-                value={newDeck.description}
-                onChange={(e) => setNewDeck({ ...newDeck, description: e.target.value })}
-                className={inputFieldClass}
-                rows="3"
-                placeholder="Describe your deck strategy..."
-              />
-            </div>
-            <label className="flex items-center">
-              <input
-                type="checkbox"
-                checked={newDeck.is_public}
-                onChange={(e) => setNewDeck({ ...newDeck, is_public: e.target.checked })}
-                className="mr-2"
-                style={{ accentColor: 'var(--accent-ember)' }}
-              />
-              <span className="text-sm" style={{ color: 'var(--text-secondary)' }}>
-                Make deck public
-              </span>
-            </label>
-            <div className="flex space-x-3 pt-2">
-              <Button
-                type="button"
-                variant="secondary"
-                onClick={() => setShowCreateModal(false)}
-                className="flex-1"
-              >
-                Cancel
-              </Button>
-              <Button type="submit" variant="primary" className="flex-1">
-                Create Deck
-              </Button>
-            </div>
-          </form>
-        </Modal>
 
         <Modal
           open={!!editingDeck}
@@ -434,7 +332,7 @@ export default function Decks() {
                   id="edit-deck-format"
                   value={editingDeck.format}
                   onChange={(e) => setEditingDeck({ ...editingDeck, format: e.target.value })}
-                  className={inputFieldClass}
+                  className={DECK_INPUT_FIELD_CLASS}
                 >
                   <option value="Commander">Commander</option>
                   <option value="Standard">Standard</option>
@@ -454,7 +352,7 @@ export default function Decks() {
                   id="edit-deck-description"
                   value={editingDeck.description || ''}
                   onChange={(e) => setEditingDeck({ ...editingDeck, description: e.target.value })}
-                  className={inputFieldClass}
+                  className={DECK_INPUT_FIELD_CLASS}
                   rows="3"
                 />
               </div>