fix: replace silent error swallowing with proper error propagation

Replace .filter_map(Result::ok).collect() with .collect::<Result<Vec<_>,_>>()?
in rename chain resolution and suffix probe queries. The old pattern silently
discarded database errors, making failures invisible. Now any rusqlite error
propagates to the caller immediately.

Affected: resolve_rename_chain (2 queries) and resolve_ambiguity (1 query).

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

src/core/path_resolver.rs

@@ -294,8 +294,7 @@ fn try_resolve_rename_ambiguity(
 
     let old_paths: Vec<String> = stmt
         .query_map(param_refs.as_slice(), |row| row.get(0))?
-        .filter_map(std::result::Result::ok)
-        .collect();
+        .collect::<std::result::Result<Vec<_>, _>>()?;
 
     // The newest path is a candidate that is NOT an old_path in any intra-chain rename.
     let newest = candidates.iter().find(|c| !old_paths.contains(c));