feat(cli): add a simple web client

[tnfssc]

This pull request introduces a new browser-based Web UI mode to the lazytail log viewer, along with the necessary command-line interface and documentation updates. The changes add a new web subcommand, argument parsing, and integrate the Web UI into the application startup logic.

Web UI feature additions:

• Added tiny_http dependency in Cargo.toml to support the embedded web server required for the Web UI.
• Introduced a new WebArgs struct in src/cmd/mod.rs for parsing arguments related to the web subcommand (host, port, files, verbosity, etc.).
• Added the web subcommand to the Commands enum in src/cmd/mod.rs and integrated it into the main command dispatch logic in src/main.rs. [1] [2]
• Created a new web module in src/main.rs to implement the Web UI functionality.

Documentation updates:

• Updated README.md to describe the new Web UI mode, including usage instructions and command-line examples. [1] [2] [3]

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[Copilot]

Pull request overview

This PR adds a new browser-based Web UI mode to lazytail by introducing a web subcommand that runs an embedded HTTP server and serves a single-page HTML client for browsing/filtering log sources.

Changes:

• Added web CLI subcommand (WebArgs) and wired it into the main command dispatcher.
• Implemented a new src/web module providing an embedded tiny_http server with JSON APIs + SSE-style long-polling.
• Added an embedded index.html Web UI and updated README + dependencies (tiny_http).

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/web/mod.rs	Implements the web server, API routes, state management, filtering, and SSE/eventing.
src/web/index.html	Embedded single-page Web UI client with virtualized source/log rendering and controls.
src/main.rs	Registers mod web; and dispatches cmd::Commands::Web to web::run.
src/cmd/mod.rs	Adds Web subcommand and WebArgs (host/port/files/watch/verbose).
README.md	Documents the new lazytail web mode and updates command list.
Cargo.toml	Adds tiny_http dependency.
Cargo.lock	Locks new transitive deps for tiny_http.

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[tnfssc]

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