refactor(ui): four UI/navigation hygiene fixes from module-by-module re-review

- popper-config.el: move `(popper-mode +1)` and `(popper-echo-mode
  +1)` from the use-package `:init` block into `:config`.
  `:disabled t' on use-package skips `:config' but still runs
  `:init', so the previous shape enabled popper-mode on every load,
  including batch / test runs, despite the disabled marker.

- modeline-config.el: make `cj/modeline-vc-fetch' fall back when
  the internal `vc-git--symbolic-ref' is missing.  `require' uses
  `nil 'noerror', the call sits inside an `fboundp' guard, and
  `ignore-errors' wraps the call itself so an Emacs version that
  renames or removes the accessor leaves `branch' at
  `vc-working-revision''s output instead of crashing the modeline.

- ui-config.el: guard the cursor-color `post-command-hook' behind
  `(display-graphic-p)' both at install time and inside the
  function body.  Batch / TTY runs short-circuit cleanly with no
  per-command overhead.  A `server-after-make-frame-hook' catches
  the daemon case where the first GUI frame is created after
  ui-config loads and installs the hook lazily.  Updates
  test-ui-config--buffer-cursor-state and
  test-ui-cursor-color-integration to stub `display-graphic-p' so
  the work body still runs under batch.

- nerd-icons-config.el: drop `:demand t' (`:defer t' now), keeping
  the `:config' advice install as the natural lazy-on-load path.
  Add a `with-eval-after-load 'nerd-icons' block as a safety net for
  the already-loaded case on re-eval; the block uses `advice-member-p'
  so the advice never stacks.

1 files changed, 11 insertions, 1 deletions

diff --git a/modules/nerd-icons-config.el b/modules/nerd-icons-config.el
index 4a8ce194d..52a4627dc 100644
--- a/modules/nerd-icons-config.el
+++ b/modules/nerd-icons-config.el
@@ -70,11 +70,21 @@ every call. The `memq' check skips when the face is already present."
 ;; ------------------------------- Packages ------------------------------------
 
 (use-package nerd-icons
-  :demand t
+  :defer t
   :config
   (advice-add 'nerd-icons-icon-for-dir :filter-return #'cj/--nerd-icons-color-dir)
   (cj/nerd-icons-apply-tint))
 
+;; If nerd-icons is already loaded (e.g. when this module is re-evaluated
+;; after a session in which a feature module already required it), the
+;; `:config' block above won't fire again -- fall through to install the
+;; advice and tint immediately.
+(with-eval-after-load 'nerd-icons
+  (unless (advice-member-p #'cj/--nerd-icons-color-dir 'nerd-icons-icon-for-dir)
+    (advice-add 'nerd-icons-icon-for-dir
+                :filter-return #'cj/--nerd-icons-color-dir))
+  (cj/nerd-icons-apply-tint))
+
 (use-package nerd-icons-completion
   :demand t
   :after (nerd-icons marginalia)