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/.aliases

@@ -38,6 +38,8 @@ alias gl='git ld'
 alias ga='git a'
 alias gr='git r'
 alias gw='git show'
+alias gf='git f'
+alias gp='git p'
 gdm() { local base="${1:-$(git symbolic-ref refs/remotes/origin/HEAD 2>/dev/null | sed 's@refs/remotes/origin/@@' || echo main)}"; git diff "${base}...HEAD"; }
 
 # fzf workflows