feat(modeline): mode icons, status segments, and a repair command

I rebuilt the custom modeline as pure segment helpers with thin :eval wiring:

- The nerd-icons mode icon replaces the mode-name text (cached per buffer, plain name on terminal frames), with the full mode name in the help-echo.
- New left-side segments: modified dot / read-only lock (file buffers only), remote @host tag, Narrow tag that widens on click, point-based percentage, region selection info, and a MACRO tag while a keyboard macro records.
- New right-side segments: mode-line-process (eat and compilation state was invisible) and flycheck per-severity counts with click-through to the error list, replacing the stock status text. Glyphs are nerd-icons private-use codepoints so emojify can't rewrite them, with text fallbacks when icons are unavailable.
- cj/modeline-reset kills a hijacked buffer-local mode-line-format (two-column mode, ediff, calc).
- Optional taller bar via cj/modeline-height-factor, a display height property on the padding space so the theme's mode-line faces stay untouched.
- Housekeeping: the dead user-constants require and stale commentary are gone, cj/modeline-vc-faces left the risky-local-variable list, and the cache-key defun is cj/--modeline-vc-cache-key so it no longer shadows the same-named defvar.

Percent signs from :eval strings go through the mode-line %-construct pass, so the position segment emits %% for a literal percent.

1 files changed, 5 insertions, 5 deletions

diff --git a/tests/test-modeline-config-vc-cache-key.el b/tests/test-modeline-config-vc-cache-key.el
index 6ba7985c..38052949 100644
--- a/tests/test-modeline-config-vc-cache-key.el
+++ b/tests/test-modeline-config-vc-cache-key.el
@@ -17,20 +17,20 @@
 (ert-deftest test-modeline-vc-cache-key-is-file-and-show-remote ()
   "Normal: the key is (FILE SHOW-REMOTE), with no per-render file-truename stat."
   (let ((cj/modeline-vc-show-remote nil))
-    (should (equal (cj/modeline-vc-cache-key "/x/y.el") '("/x/y.el" nil)))))
+    (should (equal (cj/--modeline-vc-cache-key "/x/y.el") '("/x/y.el" nil)))))
 
 (ert-deftest test-modeline-vc-cache-key-tracks-show-remote ()
   "Boundary: toggling show-remote yields a different key (separate cache entry)."
   (should-not (equal (let ((cj/modeline-vc-show-remote nil))
-                       (cj/modeline-vc-cache-key "/x/y.el"))
+                       (cj/--modeline-vc-cache-key "/x/y.el"))
                      (let ((cj/modeline-vc-show-remote t))
-                       (cj/modeline-vc-cache-key "/x/y.el")))))
+                       (cj/--modeline-vc-cache-key "/x/y.el")))))
 
 (ert-deftest test-modeline-vc-cache-key-stable-for-same-file ()
   "Boundary: the key is stable across calls for an unchanged file + show-remote."
   (let ((cj/modeline-vc-show-remote nil))
-    (should (equal (cj/modeline-vc-cache-key "/x/y.el")
-                   (cj/modeline-vc-cache-key "/x/y.el")))))
+    (should (equal (cj/--modeline-vc-cache-key "/x/y.el")
+                   (cj/--modeline-vc-cache-key "/x/y.el")))))
 
 (provide 'test-modeline-config-vc-cache-key)
 ;;; test-modeline-config-vc-cache-key.el ends here