Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@services/workspace_listing.py`:
- Line 137: The top-level composer load error log currently drops stack context
by calling _logger.error("Failed to load composer rows from global storage: %s",
e); update that call to include the exception traceback by passing exc_info=True
(i.e., _logger.error(..., exc_info=True)) so the stack trace is preserved for
operational debugging while keeping the existing message and exception
interpolation.

In `@services/workspace_tabs.py`:
- Around line 126-131: The warning currently logs the raw cursorDiskKV payload
(row["value"]) which can leak sensitive conversation data and be very large;
update the _logger.warning call(s) that reference row["value"] (the one shown
and the similar block around lines 210-215) to avoid including the raw payload
and instead log stable identifiers and payload size — keep row["key"] (or any
available stable id like bubble id) and add payload length (e.g.,
len(row.get("value", b"")) or length of the string) and/or a checksum/short hash
if you need a stable fingerprint; update the _logger.warning invocations in
workspace_tabs.py that currently format row["value"] accordingly.

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@services/workspace_tabs.py`:
- Around line 138-145: The JSON decode guard around json.loads in
services/workspace_tabs.py currently only catches json.JSONDecodeError; change
those except clauses (the one around the block that calls _kv_payload_log_meta
and logs via _logger.warning with row["key"] and e) to catch
(json.JSONDecodeError, TypeError, ValueError) so non-text SQLite values or other
decode issues are treated non-fatal; apply the same change to the other
symmetric decode block that logs payload_len/payload_fp (the second handler that
currently only catches JSONDecodeError) so both malformed KV row paths behave
consistently.