feat(gui): migrate from iced 0.14.0 to Dioxus 0.7.3 + Axum

Complete GUI framework migration (Phases 0-4):

Phase 0: Reset dioxus branch to main (v0.4.2 baseline)
Phase 1: Replace iced with dioxus 0.7.3 + axum 0.8 in workspace deps
  - Remove iced, iced_glyphon vendor patch
  - Add dioxus with fullstack, desktop, server, web feature flags
  - Add Dioxus.toml configuration
  - Bump MSRV to 1.80.0 for Dioxus compatibility

Phase 2: Core-to-Dioxus state bridge
  - Signal<AppState> context provider architecture
  - use_coroutine EventBus listener (hooks/use_irc.rs)
  - IrcActions (Copy) for direct core method calls
  - Theme hook with FromStr trait for 22 themes

Phase 3: Dioxus RSX component rebuild
  - 3-pane layout (server tree, messages, user list) via CSS flexbox
  - TabBar, StatusBar, MenuBar, ServerTree, UserList
  - MessageView with IRC formatting -> styled HTML spans
  - InputArea with history, command parsing, tab completion
  - Connect, Preferences, About dialogs
  - Context menu component

Phase 4: CSS theme system
  - 22 themes as CSS custom properties ([data-theme] selectors)
  - IRC mIRC color codes 0-15 as CSS classes
  - Tailwind CSS utility classes throughout components

All 234 workspace tests passing, zero clippy warnings, zero fmt issues.
Removed: iced, iced_glyphon vendor, Material Design 3 iced components
Kept: ratatui TUI, CLI mode, all non-GUI crates unchanged

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: doublegate

Cargo.lock

@@ -49,8 +49,8 @@ notify-rust = "4"
 tokio-socks = "0.5"
 
 # UI
-# iced 0.14.0 - Major release with reactive rendering, time-travel debugging, and API improvements
-iced = { version = "0.14.0", features = ["tokio", "debug", "advanced"] }
+dioxus = { version = "0.7.3", features = ["fullstack"] }
+axum = "0.8"
 ratatui = "0.30.0"
 crossterm = "0.29"
 
@@ -71,7 +71,7 @@ clap = { version = "4.5.53", features = ["derive"] }
 name = "rustirc"
 version = "0.4.2"
 edition = "2021"
-rust-version = "1.75.0"
+rust-version = "1.80.0"
 authors = ["RustIRC Contributors"]
 description = "A powerful, modern IRC client combining the best of mIRC, HexChat, and WeeChat"
 documentation = "https://docs.rs/rustirc"
@@ -114,8 +114,3 @@ strip = true
 opt-level = 3
 debug = false
 
-# Patch vulnerable lru 0.12.5 by replacing iced_glyphon with patched version
-# The patched version updates lru from 0.12.1 to 0.16.3 which includes the security fix
-# See SECURITY-FIX-RUSTSEC-2026-0002.md for details
-[patch.crates-io]
-iced_glyphon = { path = "vendor/iced_glyphon" }

Cargo.toml

@@ -0,0 +1,10 @@
+[application]
+name = "RustIRC"
+asset_dir = "assets"
+
+[web.app]
+title = "RustIRC - Modern IRC Client"
+
+[web.watcher]
+reload_html = true
+watch_path = ["src", "crates/rustirc-gui/src"]

Dioxus.toml

@@ -0,0 +1,68 @@
+/* RustIRC - Base CSS with theme variables */
+@import url("themes/base.css");
+
+/* Reset */
+*, *::before, *::after {
+  box-sizing: border-box;
+  margin: 0;
+  padding: 0;
+}
+
+html, body {
+  height: 100%;
+  width: 100%;
+  overflow: hidden;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
+  font-size: 14px;
+  background-color: var(--bg-color, #1a1a1a);
+  color: var(--text-color, #e0e0e0);
+}
+
+/* Scrollbar styling */
+::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+
+::-webkit-scrollbar-track {
+  background: var(--bg-color, #1a1a1a);
+}
+
+::-webkit-scrollbar-thumb {
+  background: var(--scrollbar-thumb, #444);
+  border-radius: 4px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  background: var(--scrollbar-thumb-hover, #555);
+}
+
+/* Selection */
+::selection {
+  background: var(--selection-bg, #37373d);
+  color: var(--selection-color, #e0e0e0);
+}
+
+/* Focus styles */
+*:focus-visible {
+  outline: 1px solid var(--accent-color, #4ecdc4);
+  outline-offset: -1px;
+}
+
+/* IRC color classes */
+.irc-color-0 { color: #ffffff; }
+.irc-color-1 { color: #000000; }
+.irc-color-2 { color: #00007f; }
+.irc-color-3 { color: #009300; }
+.irc-color-4 { color: #ff0000; }
+.irc-color-5 { color: #7f0000; }
+.irc-color-6 { color: #9c009c; }
+.irc-color-7 { color: #fc7f00; }
+.irc-color-8 { color: #ffff00; }
+.irc-color-9 { color: #00fc00; }
+.irc-color-10 { color: #009393; }
+.irc-color-11 { color: #00ffff; }
+.irc-color-12 { color: #0000fc; }
+.irc-color-13 { color: #ff00ff; }
+.irc-color-14 { color: #7f7f7f; }
+.irc-color-15 { color: #d2d2d2; }