fix(seer): Update no-repo warning to error severity

Change tooltip text to clarify that Seer Autofix only works (not just
works best) on projects with connected repos. Update the warning icon
variant from warning to error to better reflect the severity.

Co-Authored-By: Claude Opus 4.6 <noreply@example.com>

Agent transcript: https://claudescope.sentry.dev/share/-zUO5vF93CLRRxrOmr5BZ7SQ0CG7Pa6L5t6yvFM182w

Author: chromy

static/gsApp/views/seerAutomation/components/projectTable/seerProjectTableRow.tsx

@@ -176,10 +176,12 @@ export function SeerProjectTableRow({
         {autofixSettings ? (
           autofixSettings.reposCount === 0 ? (
             <Tooltip
-              title={t('Seer works best on projects with at least one connected repo.')}
+              title={t(
+                'Seer Autofix only works on projects with at least one connected repo.'
+              )}
             >
               <Flex align="center" gap="sm">
-                <IconWarning variant="warning" />
+                <IconWarning variant="error" />
                 <Text tabular>{0}</Text>
               </Flex>
             </Tooltip>