DshViewModes: Add Verbose, Normal, and Summary Session Display Modes for DSH Web

DshViewModes is a display plugin for the DSH Web client maintained by NigelYao, designed to optimize user experience through views with different levels of granularity. This plugin is based on the MIT license and only modifies browser-side display without interfering with core files, providing three modes: `Verbose`, `Normal`, and `Summary`. `Verbose` retains complete debugging information such as thinking and tool calls; `Normal` (default) groups process steps by semantic stages, making it suitable for daily reading and supporting the expansion of details; `Summary` hides process noise and displays only the result summary. Users can switch modes via the session header or keyboard shortcuts `Alt+1/2/3`, the selection state is saved in `localStorage`, and the interface language follows Harness Settings.