Persist resolution_reason on resolve_error so the audit log is useful

The UPDATE in `_resolve_error_impl` only touched `resolved_at` — the
`reason` argument every caller passes was silently dropped, and the
`resolution_reason` / `resolution_type` columns stayed NULL for every
auto-resolved error. The columns were added back in a previous sprint
for exactly this audit-log purpose, but the writer was never updated
to populate them.

Fix the SQL to write `resolution_reason = ?` and tag
`resolution_type = COALESCE(existing, 'auto')` so admin-cleared
errors (whose type is set elsewhere) keep their value while the
default auto path correctly labels itself.

Verified end-to-end on the lab host: re-injected the `disk_nvme2n1`
warning, waited one scan cycle, the row now reads
`resolution_type='auto'` and
`resolution_reason='Transient I/O cleared, SMART now reports healthy'`
— previously these columns stayed NULL even though the resolve_error
call passed a descriptive reason.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

AppImage/scripts/health_persistence.py

@@ -673,11 +673,21 @@ class HealthPersistence:
             cursor = conn.cursor()
             now = datetime.now().isoformat()
 
+            # Persist `reason` into the dedicated resolution_reason column
+            # (and tag resolution_type='auto' so the audit log can tell
+            # auto-resolves apart from explicit admin clears). Previously
+            # this UPDATE only touched resolved_at, so the `reason` arg
+            # every caller passes — including the new
+            # `_reconcile_stale_disk_warnings` pass — was silently dropped
+            # and the resolution_reason column stayed NULL for every
+            # auto-resolved error.
             cursor.execute('''
                 UPDATE errors
-                SET resolved_at = ?
+                SET resolved_at = ?,
+                    resolution_type = COALESCE(resolution_type, 'auto'),
+                    resolution_reason = ?
                 WHERE error_key = ? AND resolved_at IS NULL
-            ''', (now, error_key))
+            ''', (now, reason, error_key))
 
             if cursor.rowcount > 0:
                 self._record_event(cursor, 'resolved', error_key, {'reason': reason})