[Fix] Memory titles overflow the Explore memories card

[roomote-roomote]

​Opened on behalf of @mrubens. Follow up by mentioning @roomote-roomote, in the web UI, or in Slack.

What changed

• Constrained memory list rows and namespace filters so long labels truncate within the Explore memories card.
• Made the selected-memory grid tracks and flex panes shrink below their intrinsic content width.
• Contained long preview titles, slugs, and rendered content without allowing them to widen the section.

Why this change was made

Long memory titles could establish an oversized intrinsic width before text truncation applied, causing list items to extend past the right edge of the Explore memories container.

Impact

Memory titles, filters, timestamps, and preview metadata now stay within the card at desktop and narrow widths. Focused component tests, lint, type checking, the production web build, and the full pre-push checks passed. Browser screenshots were unavailable because Memory is not configured in the local sandbox, so no misleading visual evidence is included.

[roomote-community]

No code issues found. See task

_{Reviewed 0390c0c}