…-edit, insights redesign, settings transition

- SessionsSection: replace binary showAll with 3-level expand (0/1/2) for progressive disclosure; reset on workspace change
- WorkspaceBody: track divider hover state via body class (bitfun-divider-hovered); divider line only visible during active drag
- SceneViewport: add left-side glow effect on divider hover / nav resize for interaction feedback
- AgentsScene: tools & skills editing now uses pending/draft state with explicit Cancel/Save; batch API calls on save; section count reflects draft during edit
- AgentCard / AgentTeamCard: add detail modal content styles (cap grid, chips, token grid, member list)
- InsightsScene: complete visual redesign with local design tokens, two-column report layout, sticky TOC with scroll-tracking, chart colors, cleaner stats grid and horizon cards
- SettingsScene: add fade-up enter animation on tab switch via keyed content wrapper
- tokens.scss: add --font-size-xxs (10px) and --font-size-2xs (11px) tokens
- LoggingConfig: replace header button with inline tooltip icon button; path text selectable and wraps
- TerminalConfig: remove CLI agents feature; simplify to shell selection only
- i18n (en-US / zh-CN): add nav.sessions.showAll, insights.*, logging.actions.openFolderTooltip; remove cliAgents.* keys

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Co-Authored-By: BitFun