feat: replace w3m with chawan for HTML rendering and web browsing

- Create web.chawan module with enable/package options, kitty desktop entry, and programs.chawan.settings (buffer.images=true, display.image-mode=auto)
- Update neomutt macros, mailcap, and assertions from w3m to chawan
- Switch waybar window-rewrite and workspace icon from W3M to Chawan
- Drop web/w3m module

1 files changed, 13 insertions, 0 deletions

diff --git a/modules/web/chawan/assertions.nix b/modules/web/chawan/assertions.nix
new file mode 100644
index 0000000..2ab30a0
--- /dev/null
+++ b/modules/web/chawan/assertions.nix
@@ -0,0 +1,13 @@
+# Assertions - Validates kitty is enabled for chawan desktop entry
+{ config, ... }:
+{
+  assertions = [
+    {
+      assertion = !config.web.chawan.enable || config.terminal.kitty.enable;
+      message = ''
+        web.chawan is enabled but terminal.kitty.enable is not.
+        chawan's desktop entry requires kitty as the terminal launcher. Please enable terminal.kitty.
+      '';
+    }
+  ];
+}