fix: remove browser-native required validation blocking doc picker submissions

Forms lacked novalidate and textareas had required, so the browser fired
HTML5 validation before tools.js could intercept — blocking submissions
where text came from the doc picker or file upload rather than the textarea.

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

redact.php

@@ -6,7 +6,7 @@ $toolKind  = 'Redaction Assistant';
 $toolBadge = 'deterministic first';
 require_once __DIR__ . '/includes/layout.php';
 ?>
-                <form id="toolForm" class="tool-form">
+                <form id="toolForm" class="tool-form" novalidate>
 
                     <div class="lang-switcher" id="redactLangSwitcher" role="group" aria-label="UI language">
                         <button type="button" class="lang-btn is-active" data-lang="en">&#127468;&#127463; EN</button>
@@ -108,7 +108,7 @@ require_once __DIR__ . '/includes/layout.php';
                     </div>
 
                     <label class="input-label" for="toolInput" id="inputLabel" data-i18n="redactInputLabel">Pasted text</label>
-                    <textarea id="toolInput" name="toolInput" rows="10" required data-i18n-placeholder="redactInputPlaceholder" placeholder="Paste text containing names, phone numbers, emails, addresses, or national ID numbers."></textarea>
+                    <textarea id="toolInput" name="toolInput" rows="10" data-i18n-placeholder="redactInputPlaceholder" placeholder="Paste text containing names, phone numbers, emails, addresses, or national ID numbers."></textarea>
 
                     <div class="form-footer">
                         <p id="toolStatus" class="form-status" role="status" aria-live="polite"></p>