Preserve retry metadata from session.status events so the session list and header can show a live retry countdown with context. Notify users when a session enters retry and reuse the existing error styling so retrying feels actionable without losing the current badge layout.
Let users refresh a session transcript from the sidebar without reopening it. Reuse the existing forced message loading path so the reload behavior stays aligned with normal session hydration.
Adds an optional session filter bar to the left sidebar with title search across parent/child sessions and a scoped Select All. Introduces multi-select checkboxes, bulk delete with clear selection controls, and confirmation dialogs for both single and bulk deletions using the existing alert dialog flow. Updates session i18n strings across supported locales.
