Replace red with amber, unify palette, add fetch/pull aliases

- Add git aliases: f (fetch), p (pull) and shell aliases: gf, gp
- Replace all #F40404 (red) with #F88C14 (amber) across prompt, gitconfig,
  vim, bat theme, and tmux scripts for colourblind-friendly palette
- Standardise hex case to uppercase throughout
- Unify #728cb8 → #7290B8 (fix blue inconsistency)
- Replace unique #8787AF with palette #7290B8 in gitconfig
- Remove unused red colour definition from prompt.zsh
- Update dark diff backgrounds from red-tinted to amber-tinted

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

home/.gitconfig

@@ -35,12 +35,12 @@
   hunk-header-decoration-style = none
   line-numbers-left-style = "#808080"
   line-numbers-right-style = "#808080"
-  line-numbers-minus-style = "#F40404"
+  line-numbers-minus-style = "#F88C14"
   line-numbers-plus-style = "#2CB494"
-  plus-style = syntax "#0c2a24"
-  plus-emph-style = syntax "#164a3c"
-  minus-style = syntax "#2a0a0a"
-  minus-emph-style = syntax "#3a1a1a"
+  plus-style = syntax "#0C2A24"
+  plus-emph-style = syntax "#164A3C"
+  minus-style = syntax "#2A1A0A"
+  minus-emph-style = syntax "#3A2A1A"
 
 [merge]
   conflictstyle = zdiff3
@@ -50,14 +50,14 @@
 
 [color "status"]
   added = "#2CB494"
-  changed = "#8787AF"
+  changed = "#7290B8"
   untracked = "#F88C14" italic
   branch = "#2CB494"
   header = "#CCE0D0"
 [color "diff"]
   meta = "#88409C"
   frag = "#4068D4"
-  old = "#F40404"
+  old = "#F88C14"
   new = "#2CB494"
   context = "#808080"
   commit = "#F88C14"
@@ -93,6 +93,8 @@
   cm = commit -m
   cam = commit -a -m
   m = commit --amend --verbose
+  f = fetch
+  p = pull
   st = stash
   sa = stash apply