feat: add Opusplan model option and update dependencies

Added support for the "opusplan" model which combines Claude
Opus 4.1 and Sonnet 4.5 for enhanced planning capabilities. Also
updated Sonnet model name from "4" to "4.5" for clarity.

Updated fixture dependencies to their latest versions:
- mini.files, mini.icons: latest commits  
- nvim-tree.lua, nvim-web-devicons: latest commits
- oil.nvim, tokyonight.nvim: latest commits across all fixtures

Author: ThomasK33

fixtures/mini-files/lazy-lock.json

@@ -1,5 +1,5 @@
 {
   "lazy.nvim": { "branch": "main", "commit": "6c3bda4aca61a13a9c63f1c1d1b16b9d3be90d7a" },
-  "mini.files": { "branch": "main", "commit": "5b9431cf5c69b8e69e5a67d2d12338a3ac2e1541" },
-  "tokyonight.nvim": { "branch": "main", "commit": "057ef5d260c1931f1dffd0f052c685dcd14100a3" }
+  "mini.files": { "branch": "main", "commit": "d22c5b74b7764d0bd33e4988e5ee00139cfe22e3" },
+  "tokyonight.nvim": { "branch": "main", "commit": "4d159616aee17796c2c94d2f5f87d2ee1a3f67c7" }
 }

fixtures/netrw/lazy-lock.json

@@ -1,4 +1,4 @@
 {
   "lazy.nvim": { "branch": "main", "commit": "6c3bda4aca61a13a9c63f1c1d1b16b9d3be90d7a" },
-  "tokyonight.nvim": { "branch": "main", "commit": "057ef5d260c1931f1dffd0f052c685dcd14100a3" }
+  "tokyonight.nvim": { "branch": "main", "commit": "4d159616aee17796c2c94d2f5f87d2ee1a3f67c7" }
 }

fixtures/nvim-tree/lazy-lock.json

@@ -1,6 +1,6 @@
 {
   "lazy.nvim": { "branch": "main", "commit": "6c3bda4aca61a13a9c63f1c1d1b16b9d3be90d7a" },
-  "nvim-tree.lua": { "branch": "master", "commit": "0a52012d611f3c1492b8d2aba363fabf734de91d" },
-  "nvim-web-devicons": { "branch": "master", "commit": "3362099de3368aa620a8105b19ed04c2053e38c0" },
-  "tokyonight.nvim": { "branch": "main", "commit": "057ef5d260c1931f1dffd0f052c685dcd14100a3" }
+  "nvim-tree.lua": { "branch": "master", "commit": "e179ad2f83b5955ab0af653069a493a1828c2697" },
+  "nvim-web-devicons": { "branch": "master", "commit": "f6b0920f452bfd7595ee9a9efe5e1ae78e0e2997" },
+  "tokyonight.nvim": { "branch": "main", "commit": "4d159616aee17796c2c94d2f5f87d2ee1a3f67c7" }
 }

fixtures/oil/lazy-lock.json

@@ -1,6 +1,6 @@
 {
   "lazy.nvim": { "branch": "main", "commit": "6c3bda4aca61a13a9c63f1c1d1b16b9d3be90d7a" },
-  "mini.icons": { "branch": "main", "commit": "b8f6fa6f5a3fd0c56936252edcd691184e5aac0c" },
-  "oil.nvim": { "branch": "master", "commit": "bbad9a76b2617ce1221d49619e4e4b659b3c61fc" },
-  "tokyonight.nvim": { "branch": "main", "commit": "057ef5d260c1931f1dffd0f052c685dcd14100a3" }
+  "mini.icons": { "branch": "main", "commit": "e8fae66cb400744daeedf6e387347df50271c252" },
+  "oil.nvim": { "branch": "master", "commit": "919e155fdf38e9148cdb5304faaaf53c20d703ea" },
+  "tokyonight.nvim": { "branch": "main", "commit": "4d159616aee17796c2c94d2f5f87d2ee1a3f67c7" }
 }

lua/claudecode/config.lua

@@ -29,7 +29,8 @@ M.defaults = {
   },
   models = {
     { name = "Claude Opus 4.1 (Latest)", value = "opus" },
-    { name = "Claude Sonnet 4 (Latest)", value = "sonnet" },
+    { name = "Claude Sonnet 4.5 (Latest)", value = "sonnet" },
+    { name = "Opusplan: Claude Opus 4.1 (Latest) + Sonnet 4.5 (Latest)", value = "opusplan" },
     { name = "Claude Haiku 3.5 (Latest)", value = "haiku" },
   },
   terminal = nil, -- Will be lazy-loaded to avoid circular dependency