feat(packages): Add gptel and org-habit

- Configure gptel to use the Gemini 2.5 Pro model via the GitHub Copilot backend.
- Enable the org-habit module for habit tracking in Org mode.

config.org

@@ -123,6 +123,20 @@ Thisenables the feature of auto-expanding snippets when matching the pattern
 #+begin_src emacs-lisp :tangle packages.el
 (package! leetcode)
 #+end_src
+*** gptel
+
+#+begin_src emacs-lisp
+(use-package! gptel
+    :config
+    (setq! gptel-api-key "e994f45f9b46cc8608bd2e9cd508417255514e96913b1764aab612512aa66449")
+    (setq gptel-model 'claude-sonnet-4.5)
+    (setq gptel-backend (gptel-make-gh-copilot "Copilot"))
+    )
+#+end_src
+
+#+RESULTS:
+: t
+
 ** Lang
 *** Typst
 **** Tree-sitter
@@ -185,6 +199,10 @@ Thisenables the feature of auto-expanding snippets when matching the pattern
 (load-file "lisp/texpresso/texpresso.el")
 #+end_src
 *** Org
+#+begin_src elisp
+(add-to-list 'org-modules 'org-habit)
+#+end_src
+**** Latex live-preview (fast)
 1. delete all org-* packages from emacs (can be done by deleting folders in .local/straight)
 2. delete eln-cache
 3. doom sync -u
@@ -271,4 +289,4 @@ Thisenables the feature of auto-expanding snippets when matching the pattern
   )
 #+end_src
 
-
+hello