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Introduce background data refresh so the dashboard stays current without restarting. This touches four layers: Config (config.go): - New TUIConfig struct with AutoRefresh (bool) and RefreshIntervalSec (int) fields, defaulting to enabled at 30-second intervals. - Minimum interval floor of 10 seconds enforced at load time. App core (app.go): - RefreshDataMsg type for background refresh completion signaling. - Auto-refresh state: interval timer, refreshing flag, lastRefresh timestamp. Checked on every tick; fires refreshDataCmd when elapsed. - refreshDataCmd: background goroutine that loads session data via cache (with uncached fallback) and posts RefreshDataMsg on completion. - Manual refresh keybind: 'r' triggers immediate refresh. - Auto-refresh toggle keybind: 'R' toggles auto-refresh and persists the preference to config.toml. - Help text updated with r/R keybind documentation. Status bar (statusbar.go): - Shows spinning refresh indicator during active refresh. - Shows auto-refresh icon when auto-refresh is enabled. Settings tab (tab_settings.go): - Two new editable fields: Auto Refresh (bool) and Refresh Interval (seconds with 10s minimum). - Settings display reads live App state to stay consistent with the R toggle keybind (avoids stale config-file reads). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>