Left align Critical checkbox in Save policy modal (#39786)

<!-- Add the related story/sub-task/bug number, like Resolves #123, or
remove if NA -->
**Related issue:** Resolves #39423 

# Checklist for submitter

- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.

## Testing

- [x] QA'd all new/changed functionality manually

### Before

<img width="693" height="808" alt="Screenshot 2026-02-12 at 4 53 53 PM"
src="https://github.com/user-attachments/assets/ba60d010-2e1b-4a10-86c3-b229bdd9eddc"
/>


### After

<img width="712" height="809" alt="Screenshot 2026-02-12 at 4 57 36 PM"
src="https://github.com/user-attachments/assets/d4271b5f-b721-4081-8cff-d48821a635e9"
/>

---------

Co-authored-by: jacobshandling <61553566+jacobshandling@users.noreply.github.com>

changes/39423-left-align-critical-checkbox-save-policy

@@ -0,0 +1 @@
+- Left-aligned "Critical" checkbox in Save policy form.

frontend/pages/policies/PolicyPage/components/SaveNewPolicyModal/SaveNewPolicyModal.tsx

@@ -308,7 +308,6 @@ const SaveNewPolicyModal = ({
                 name="critical-policy"
                 onChange={(value: boolean) => setLastEditedQueryCritical(value)}
                 value={lastEditedQueryCritical}
-                isLeftLabel
                 disabled={disableForm}
               >
                 <TooltipWrapper
@@ -319,7 +318,7 @@ const SaveNewPolicyModal = ({
                     </p>
                   }
                 >
-                  Critical:
+                  Critical
                 </TooltipWrapper>
               </Checkbox>
             </div>

frontend/pages/policies/PolicyPage/components/SaveNewPolicyModal/_styles.scss

@@ -0,0 +1,3 @@
+.critical-checkbox-wrapper .fleet-checkbox__label {
+  font-weight: $bold;
+}