fix: poll creator modal — replace non-existent CSS vars with folds tokens

The modal was built with raw <div>/<input> and CSS custom properties
(--bg-surface, --bg-surface-low, --tc-surface-high, etc.) that don't
exist in Cinny's vanilla-extract theme, causing invisible/unstyled
inputs and a transparent background.

Rewrite to match the ReportRoomModal pattern:
- Overlay + OverlayBackdrop + OverlayCenter for the backdrop
- FocusTrap (clickOutsideDeactivates, escapeDeactivates via stopPropagation)
- Box as="form" with color.Surface.Container background and color.Other.Shadow
- Header variant="Surface" for the title bar
- folds Input variant="Background" for all text fields (replaces raw <input>)
- color.Critical.Main for error text
- Spinner before prop on submit button while submitting
- All spacing/radii from config.* tokens

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/features/room/PollCreator.tsx

@@ -1,7 +1,24 @@
-import React, { useState } from 'react';
+import React, { FormEventHandler, useState } from 'react';
+import FocusTrap from 'focus-trap-react';
+import {
+  Box,
+  Button,
+  Header,
+  Icon,
+  IconButton,
+  Icons,
+  Input,
+  Overlay,
+  OverlayBackdrop,
+  OverlayCenter,
+  Spinner,
+  Text,
+  color,
+  config,
+} from 'folds';
 import { Room } from 'matrix-js-sdk';
-import { Box, Button, Icon, IconButton, Icons, Text, config } from 'folds';
 import { useMatrixClient } from '../../hooks/useMatrixClient';
+import { stopPropagation } from '../../utils/keyboard';
 
 interface PollCreatorProps {
   roomId: string;
@@ -35,7 +52,10 @@ export function PollCreator({ roomId, onClose }: PollCreatorProps) {
     setOptions((prev) => prev.filter((_, i) => i !== index));
   };
 
-  const handleSubmit = async () => {
+  const handleSubmit: FormEventHandler<HTMLFormElement> = async (e) => {
+    e.preventDefault();
+    if (submitting) return;
+
     const trimmedQuestion = question.trim();
     if (!trimmedQuestion) {
       setError('Please enter a question.');
@@ -68,182 +88,177 @@ export function PollCreator({ roomId, onClose }: PollCreatorProps) {
   };
 
   return (
-    <div
-      style={{
-        position: 'fixed',
-        inset: 0,
-        zIndex: 1000,
-        display: 'flex',
-        alignItems: 'center',
-        justifyContent: 'center',
-        background: 'rgba(0,0,0,0.5)',
-      }}
-      onClick={(e) => {
-        if (e.target === e.currentTarget) onClose();
-      }}
-    >
-      <div
-        style={{
-          background: 'var(--bg-surface)',
-          borderRadius: config.radii.R400,
-          padding: config.space.S500,
-          width: '100%',
-          maxWidth: '420px',
-          display: 'flex',
-          flexDirection: 'column',
-          gap: config.space.S300,
-          boxShadow: '0 8px 32px rgba(0,0,0,0.24)',
-        }}
-      >
-        <Box direction="Row" alignItems="Center" justifyContent="SpaceBetween">
-          <Text size="H4">Create Poll</Text>
-          <IconButton
-            size="300"
-            radii="300"
-            variant="SurfaceVariant"
-            onClick={onClose}
-            aria-label="Close poll creator"
-          >
-            <Icon src={Icons.Cross} size="100" />
-          </IconButton>
-        </Box>
-
-        <div style={{ display: 'flex', flexDirection: 'column', gap: config.space.S100 }}>
-          <Text size="L400">Question</Text>
-          <input
+    <Overlay open backdrop={<OverlayBackdrop />}>
+      <OverlayCenter>
+        <FocusTrap
+          focusTrapOptions={{
+            initialFocus: false,
+            onDeactivate: onClose,
+            clickOutsideDeactivates: true,
+            escapeDeactivates: stopPropagation,
+          }}
+        >
+          <Box
+            as="form"
+            role="dialog"
+            aria-modal="true"
+            aria-labelledby="poll-creator-title"
+            onSubmit={handleSubmit}
+            direction="Column"
             style={{
-              background: 'var(--bg-surface-low)',
-              border: '1px solid var(--bg-surface-border)',
-              borderRadius: config.radii.R300,
-              padding: `${config.space.S200} ${config.space.S300}`,
-              color: 'var(--tc-surface-high)',
-              fontSize: '14px',
-              outline: 'none',
-              width: '100%',
-              boxSizing: 'border-box',
+              background: color.Surface.Container,
+              borderRadius: config.radii.R400,
+              boxShadow: color.Other.Shadow,
+              width: '100vw',
+              maxWidth: 440,
+              overflow: 'hidden',
             }}
-            type="text"
-            placeholder="Ask a question..."
-            value={question}
-            onChange={(e) => setQuestion(e.target.value)}
-            autoFocus
-          />
-        </div>
-
-        <div style={{ display: 'flex', flexDirection: 'column', gap: config.space.S100 }}>
-          <Text size="L400">Options</Text>
-          {options.map((opt, index) => (
-            <div
-              key={index}
+          >
+            {/* Header */}
+            <Header
+              variant="Surface"
+              size="500"
               style={{
-                display: 'flex',
-                alignItems: 'center',
-                gap: config.space.S100,
+                padding: `0 ${config.space.S200} 0 ${config.space.S400}`,
+                borderBottomWidth: config.borderWidth.B300,
               }}
             >
-              <input
-                style={{
-                  flex: 1,
-                  background: 'var(--bg-surface-low)',
-                  border: '1px solid var(--bg-surface-border)',
-                  borderRadius: config.radii.R300,
-                  padding: `${config.space.S200} ${config.space.S300}`,
-                  color: 'var(--tc-surface-high)',
-                  fontSize: '14px',
-                  outline: 'none',
-                  boxSizing: 'border-box',
-                }}
-                type="text"
-                placeholder={`Option ${index + 1}`}
-                value={opt}
-                onChange={(e) => handleOptionChange(index, e.target.value)}
-              />
-              <IconButton
-                size="300"
-                radii="300"
-                variant="SurfaceVariant"
-                onClick={() => handleRemoveOption(index)}
-                disabled={options.length <= 2}
-                aria-label={`Remove option ${index + 1}`}
-              >
-                <Icon src={Icons.Cross} size="100" />
+              <Box grow="Yes">
+                <Text id="poll-creator-title" size="H4">
+                  Create Poll
+                </Text>
+              </Box>
+              <IconButton size="300" radii="300" onClick={onClose} aria-label="Close">
+                <Icon src={Icons.Cross} />
               </IconButton>
-            </div>
-          ))}
-          {options.length < 10 && (
-            <button
-              type="button"
-              onClick={handleAddOption}
-              style={{
-                display: 'flex',
-                alignItems: 'center',
-                gap: config.space.S100,
-                background: 'none',
-                border: 'none',
-                cursor: 'pointer',
-                color: 'var(--tc-surface-low)',
-                fontSize: '13px',
-                padding: `${config.space.S100} 0`,
-                alignSelf: 'flex-start',
-              }}
-            >
-              <Icon src={Icons.Plus} size="100" />
-              <span>Add Option</span>
-            </button>
-          )}
-        </div>
+            </Header>
 
-        <Box direction="Column" gap="100">
-          <Text size="L400">Selection Type</Text>
-          <Box gap="200">
-            {(['single', 'multiple'] as const).map((type) => {
-              const active = type === 'multiple' ? isMultiple : !isMultiple;
-              return (
+            {/* Body */}
+            <Box direction="Column" gap="400" style={{ padding: config.space.S400 }}>
+              {/* Question */}
+              <Box direction="Column" gap="100">
+                <Text as="label" htmlFor="poll-question" size="L400">
+                  Question
+                </Text>
+                <Input
+                  id="poll-question"
+                  variant="Background"
+                  placeholder="Ask a question…"
+                  value={question}
+                  onChange={(e: React.ChangeEvent<HTMLInputElement>) => setQuestion(e.target.value)}
+                  // eslint-disable-next-line jsx-a11y/no-autofocus
+                  autoFocus
+                />
+              </Box>
+
+              {/* Options */}
+              <Box direction="Column" gap="200">
+                <Text size="L400">Options</Text>
+                {options.map((opt, index) => (
+                  // eslint-disable-next-line react/no-array-index-key
+                  <Box key={index} alignItems="Center" gap="200">
+                    <Input
+                      style={{ flex: 1 }}
+                      variant="Background"
+                      placeholder={`Option ${index + 1}`}
+                      value={opt}
+                      onChange={(e: React.ChangeEvent<HTMLInputElement>) =>
+                        handleOptionChange(index, e.target.value)
+                      }
+                      aria-label={`Option ${index + 1}`}
+                    />
+                    <IconButton
+                      size="300"
+                      radii="300"
+                      variant="SurfaceVariant"
+                      type="button"
+                      onClick={() => handleRemoveOption(index)}
+                      disabled={options.length <= 2}
+                      aria-label={`Remove option ${index + 1}`}
+                    >
+                      <Icon src={Icons.Cross} size="100" />
+                    </IconButton>
+                  </Box>
+                ))}
+                {options.length < 10 && (
+                  <Box>
+                    <Button
+                      type="button"
+                      size="300"
+                      variant="Secondary"
+                      fill="None"
+                      radii="300"
+                      before={<Icon src={Icons.Plus} size="100" />}
+                      onClick={handleAddOption}
+                    >
+                      <Text size="B300">Add Option</Text>
+                    </Button>
+                  </Box>
+                )}
+              </Box>
+
+              {/* Selection type */}
+              <Box direction="Column" gap="100">
+                <Text size="L400">Selection Type</Text>
+                <Box gap="200">
+                  {(['single', 'multiple'] as const).map((type) => {
+                    const active = type === 'multiple' ? isMultiple : !isMultiple;
+                    return (
+                      <Button
+                        key={type}
+                        type="button"
+                        size="300"
+                        variant="Primary"
+                        fill={active ? 'Solid' : 'None'}
+                        radii="300"
+                        onClick={() => setIsMultiple(type === 'multiple')}
+                      >
+                        <Text size="B300">
+                          {type === 'single' ? 'Single choice' : 'Multiple choice'}
+                        </Text>
+                      </Button>
+                    );
+                  })}
+                </Box>
+              </Box>
+
+              {/* Error */}
+              {error && (
+                <Text size="T300" style={{ color: color.Critical.Main }}>
+                  {error}
+                </Text>
+              )}
+
+              {/* Footer actions */}
+              <Box gap="200" justifyContent="End">
                 <Button
-                  key={type}
-                  size="300"
-                  variant="Primary"
-                  fill={active ? 'Solid' : 'None'}
+                  type="button"
+                  size="400"
+                  variant="Secondary"
+                  fill="None"
                   radii="300"
-                  onClick={() => setIsMultiple(type === 'multiple')}
+                  onClick={onClose}
                 >
-                  <Text size="B300">{type === 'single' ? 'Single choice' : 'Multiple choice'}</Text>
+                  <Text size="B400">Cancel</Text>
                 </Button>
-              );
-            })}
+                <Button
+                  type="submit"
+                  size="400"
+                  variant="Primary"
+                  fill="Solid"
+                  radii="300"
+                  aria-disabled={submitting}
+                  before={
+                    submitting ? <Spinner variant="Primary" fill="Solid" size="200" /> : undefined
+                  }
+                >
+                  <Text size="B400">{submitting ? 'Creating…' : 'Create Poll'}</Text>
+                </Button>
+              </Box>
+            </Box>
           </Box>
-        </Box>
-
-        {error && (
-          <Text size="T200" style={{ color: 'var(--tc-danger-normal)' }}>
-            {error}
-          </Text>
-        )}
-
-        <Box direction="Row" justifyContent="End" gap="200">
-          <Button
-            size="400"
-            variant="Secondary"
-            fill="Soft"
-            radii="300"
-            onClick={onClose}
-            type="button"
-          >
-            <Text size="B400">Cancel</Text>
-          </Button>
-          <Button
-            size="400"
-            variant="Primary"
-            fill="Solid"
-            radii="300"
-            onClick={handleSubmit}
-            type="button"
-            disabled={submitting}
-          >
-            <Text size="B400">{submitting ? 'Creating…' : 'Create Poll'}</Text>
-          </Button>
-        </Box>
-      </div>
-    </div>
+        </FocusTrap>
+      </OverlayCenter>
+    </Overlay>
   );
 }