fix: update AI Mailer configuration, adjust polling interval, and modify logging level

feat: update NixOS channel to 25.05 and remove unused unstable imports
fix: correct keyboard layout configuration in sway
feat: update ai-mailer package source and hash

hosts/nb/modules/nvim/config/utils.lua

@@ -1,16 +1,16 @@
--- null-ls
-local nb = require('null-ls').builtins
+-- none-ls
+local nb = require('none-ls').builtins
 
-require('null-ls').setup({
-    sources = {
-        nb.formatting.alejandra,
-        nb.code_actions.statix,
-        nb.diagnostics.cppcheck,
-        nb.diagnostics.deadnix,
-        nb.diagnostics.statix,
-        nb.diagnostics.eslint,
-        nb.completion.spell,
-    },
+require('none-ls').setup({
+  sources = {
+    nb.formatting.alejandra,
+    nb.code_actions.statix,
+    nb.diagnostics.cppcheck,
+    nb.diagnostics.deadnix,
+    nb.diagnostics.statix,
+    nb.diagnostics.eslint,
+    nb.completion.spell,
+  },
 })
 
 require("gitsigns").setup()