feat(09-05): add helpTextPrefix prop and fix tooltip placement + hover behavior

- TextFieldMD3: add helpTextPrefix prop rendered inline left of helpText
- Guard changed to (helpText || helpTextPrefix) so icon renders without helpText
- FieldRenderer: move tooltip icon from above field to inline with helpText via helpTextPrefix
- FieldRenderer: add hoverTooltip state; tooltip visible on mouseEnter, dismisses on mouseLeave
- FieldRenderer: click-to-unpin clears hoverTooltip to prevent sticky tooltip after dismiss
- PasswordField: same tooltip fix as FieldRenderer text-branch
- Select-branch also gains hover support

src/components/ui/FieldRenderer.tsx

@@ -12,6 +12,7 @@ interface FieldRendererProps {
 
 export function FieldRenderer({ field, register, error }: FieldRendererProps) {
   const [showTooltip, setShowTooltip] = useState(false);
+  const [hoverTooltip, setHoverTooltip] = useState(false);
 
   // provider field: single-option select — hide from UI, auto-register with default value
   if (field.key === 'provider' && field.options?.length === 1) {
@@ -48,7 +49,9 @@ export function FieldRenderer({ field, register, error }: FieldRendererProps) {
           {field.tooltipText && (
             <button
               type="button"
-              onClick={() => setShowTooltip(v => !v)}
+              onClick={() => { setShowTooltip(v => { if (v) setHoverTooltip(false); return !v; }); }}
+              onMouseEnter={() => setHoverTooltip(true)}
+              onMouseLeave={() => setHoverTooltip(false)}
               aria-label={`More info about ${field.label}`}
               className="text-primary hover:text-primary text-xs leading-none"
             >
@@ -56,7 +59,7 @@ export function FieldRenderer({ field, register, error }: FieldRendererProps) {
             </button>
           )}
         </div>
-        {field.tooltipText && showTooltip && (
+        {field.tooltipText && (showTooltip || hoverTooltip) && (
           <p className="text-xs text-primary bg-primary/10 border border-primary/30 rounded px-2 py-1.5 mt-1">
             {field.tooltipText}
           </p>
@@ -80,23 +83,23 @@ export function FieldRenderer({ field, register, error }: FieldRendererProps) {
   }
 
   // text (default) — uses TextFieldMD3 for floating label
+  const tooltipIcon = field.tooltipText ? (
+    <button
+      type="button"
+      onClick={() => { setShowTooltip(v => { if (v) setHoverTooltip(false); return !v; }); }}
+      onMouseEnter={() => setHoverTooltip(true)}
+      onMouseLeave={() => setHoverTooltip(false)}
+      aria-label={`More info about ${field.label}`}
+      className="text-primary hover:text-primary/80 text-xs leading-none mt-px shrink-0"
+    >
+      ⓘ
+    </button>
+  ) : undefined;
+
+  const tooltipVisible = showTooltip || hoverTooltip;
+
   return (
     <div className="flex flex-col gap-1">
-      {field.tooltipText && (
-        <button
-          type="button"
-          onClick={() => setShowTooltip(v => !v)}
-          aria-label={`More info about ${field.label}`}
-          className="text-primary hover:text-primary text-xs leading-none self-start"
-        >
-          ⓘ
-        </button>
-      )}
-      {field.tooltipText && showTooltip && (
-        <p className="text-xs text-primary bg-primary/10 border border-primary/30 rounded px-2 py-1.5">
-          {field.tooltipText}
-        </p>
-      )}
       <TextFieldMD3
         id={field.key}
         label={field.label}
@@ -104,7 +107,13 @@ export function FieldRenderer({ field, register, error }: FieldRendererProps) {
         registration={register(field.key)}
         helpText={field.helpText}
         required={field.required}
+        helpTextPrefix={tooltipIcon}
       />
+      {field.tooltipText && tooltipVisible && (
+        <p className="text-xs text-primary bg-primary/10 border border-primary/30 rounded px-2 py-1.5">
+          {field.tooltipText}
+        </p>
+      )}
     </div>
   );
 }

src/components/ui/PasswordField.tsx

@@ -14,6 +14,7 @@ interface PasswordFieldProps {
 export function PasswordField({ id, label, error, registration, helpText, tooltipText }: PasswordFieldProps) {
   const [show, setShow] = useState(false);
   const [showTooltip, setShowTooltip] = useState(false);
+  const [hoverTooltip, setHoverTooltip] = useState(false);
 
   const toggleButton = (
     <button
@@ -26,23 +27,23 @@ export function PasswordField({ id, label, error, registration, helpText, toolti
     </button>
   );
 
+  const tooltipIcon = tooltipText ? (
+    <button
+      type="button"
+      onClick={() => { setShowTooltip(v => { if (v) setHoverTooltip(false); return !v; }); }}
+      onMouseEnter={() => setHoverTooltip(true)}
+      onMouseLeave={() => setHoverTooltip(false)}
+      aria-label={`More info about ${label}`}
+      className="text-primary hover:text-primary/80 text-xs leading-none mt-px shrink-0"
+    >
+      ⓘ
+    </button>
+  ) : undefined;
+
+  const tooltipVisible = showTooltip || hoverTooltip;
+
   return (
     <div className="flex flex-col gap-1">
-      {tooltipText && (
-        <button
-          type="button"
-          onClick={() => setShowTooltip(v => !v)}
-          aria-label={`More info about ${label}`}
-          className="text-primary hover:text-primary text-xs leading-none self-start"
-        >
-          ⓘ
-        </button>
-      )}
-      {tooltipText && showTooltip && (
-        <p className="text-xs text-primary bg-primary/10 border border-primary/30 rounded px-2 py-1.5">
-          {tooltipText}
-        </p>
-      )}
       <TextFieldMD3
         id={id}
         label={label}
@@ -50,8 +51,14 @@ export function PasswordField({ id, label, error, registration, helpText, toolti
         registration={registration}
         type={show ? 'text' : 'password'}
         helpText={helpText}
+        helpTextPrefix={tooltipIcon}
         suffix={toggleButton}
       />
+      {tooltipText && tooltipVisible && (
+        <p className="text-xs text-primary bg-primary/10 border border-primary/30 rounded px-2 py-1.5">
+          {tooltipText}
+        </p>
+      )}
     </div>
   );
 }

src/components/ui/TextFieldMD3.tsx

@@ -7,6 +7,7 @@ interface TextFieldMD3Props {
   registration: UseFormRegisterReturn;
   type?: 'text' | 'password';
   helpText?: string;
+  helpTextPrefix?: React.ReactNode;
   required?: boolean;
   suffix?: React.ReactNode;
 }
@@ -18,6 +19,7 @@ export function TextFieldMD3({
   registration,
   type = 'text',
   helpText,
+  helpTextPrefix,
   required,
   suffix,
 }: TextFieldMD3Props) {
@@ -62,8 +64,13 @@ export function TextFieldMD3({
           <div className="absolute right-2 top-1/2 -translate-y-1/2">{suffix}</div>
         )}
       </div>
-      {helpText && !error && (
+      {(helpText || helpTextPrefix) && !error && (
-        <p className="text-xs text-on-surface-container/70">{helpText}</p>
+        <div className="flex items-start gap-1">
+          {helpTextPrefix}
+          {helpText && (
+            <p className="text-xs text-on-surface-container/70">{helpText}</p>
+          )}
+        </div>
       )}
       {error && (
         <p className="text-xs text-error" role="alert">