feat: add full WebSocket testing and history support

[bajrangCoder]

Summary

Add complete WebSocket testing support to Setu, including connection configuration, message exchange, collections, and persistent history.

What changed

• Added ws:// and wss:// connection support.
• Added connection cancellation, disconnect handling, timeouts, and stale-session protection.
• Added query parameters, headers, authentication, environment variables, and subprotocols.
• Added text, JSON, and binary message sending.
• Added incoming, outgoing, system, ping, pong, close, and error timeline entries.
• Added a virtualized message timeline with bounded memory usage.
• Added a minimal, vertically resizable message composer.
• Added WebSocket request save/load support for collections.
• Added WebSocket History entries with bounded message transcripts.
• Restored saved messages and counters when reopening History entries.
• Added message counts and WebSocket badges to the History sidebar.
• Added migration-safe serialization for existing HTTP collections and History.

[greptile-apps]

Greptile Summary

The PR adds end-to-end WebSocket request support, including connection configuration, messaging, persistence, and history.

• Resolves WebSocket URLs, headers, parameters, authentication, and subprotocols against the active environment before connecting.
• Adds text, JSON, and binary message composition with a bounded timeline.
• Adds collection and history serialization for WebSocket requests and transcripts.
• Adds WebSocket-specific status, protocol, composer, timeline, and sidebar UI.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
src/views/websocket_view.rs	Coordinates WebSocket request resolution, connection lifecycle, event handling, message sending, and history updates; the prior subprotocol-placeholder defect is fixed by resolving templates before transport validation.
src/websocket/client.rs	Implements asynchronous WebSocket connection, handshake preparation, protocol validation, message transport, cancellation, and timeout handling.
src/entities/websocket.rs	Defines persisted WebSocket request, session, timeline, and bounded-history data models.
src/components/websocket_composer.rs	Adds text, JSON, and binary payload composition and file selection.
src/components/websocket_message_list.rs	Adds the virtualized WebSocket event timeline and binary payload saving interface.
src/entities/history.rs	Extends history persistence and migration-compatible serialization for WebSocket sessions.
src/entities/collections.rs	Extends saved collection requests to support both HTTP and WebSocket data.

Sequence Diagram

sequenceDiagram
    participant U as User
    participant V as WebSocketView
    participant E as Environment Resolver
    participant C as WebSocket Client
    participant S as WebSocket Server
    U->>V: Connect request
    V->>E: Resolve URL, headers, params, auth, subprotocols
    E-->>V: Resolved request or interpolation error
    alt Resolution succeeds
        V->>C: Connect with resolved configuration
        C->>S: WebSocket handshake
        S-->>C: Connection and selected subprotocol
        C-->>V: Session events
    else Resolution fails
        V-->>U: Display error and abort connection
    end

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_{Reviews (2): Last reviewed commit: "fix" | Re-trigger Greptile}