Add tracked Git hooks and refactor timeline arrows

- Add .githooks directory with pre-commit hook for cv.webp generation
- Create installation script for hooks setup
- Add documentation for hooks usage
- Refactor timeline arrows into reusable commands (\timelinearrow and \timelinearrowcontinue)
- Simplify arrow usage by only requiring length parameter

.githooks/README.md

@@ -0,0 +1,33 @@
+# Git Hooks
+
+This directory contains Git hooks for the CV project.
+
+## Installation
+
+To install the hooks, run:
+
+```bash
+.githooks/install-hooks.sh
+```
+
+Or, configure Git to use this directory for hooks (Git 2.9+):
+
+```bash
+git config core.hooksPath .githooks
+```
+
+## Available Hooks
+
+### pre-commit
+
+Automatically generates `img/cv.webp` from `cv.pdf` when changes are committed.
+
+**Requirements:**
+- `pdftoppm` (from poppler-utils)
+- `magick` (ImageMagick)
+
+The hook will:
+1. Check if `cv.pdf` is being committed or has been modified
+2. Convert the first page of `cv.pdf` to a WebP image
+3. Save it as `img/cv.webp`
+4. Add the generated image to the commit

.githooks/install-hooks.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+# Install git hooks from .githooks directory
+
+HOOKS_DIR=".githooks"
+GIT_HOOKS_DIR=".git/hooks"
+
+# Ensure .git/hooks directory exists
+if [ ! -d "$GIT_HOOKS_DIR" ]; then
+    echo "Error: .git/hooks directory not found. Are you in a git repository?"
+    exit 1
+fi
+
+# Copy all hooks from .githooks to .git/hooks
+for hook in "$HOOKS_DIR"/*; do
+    # Skip this installation script
+    if [ "$(basename "$hook")" = "install-hooks.sh" ] || [ "$(basename "$hook")" = "README.md" ]; then
+        continue
+    fi
+
+    if [ -f "$hook" ]; then
+        hook_name=$(basename "$hook")
+        echo "Installing $hook_name..."
+        cp "$hook" "$GIT_HOOKS_DIR/$hook_name"
+        chmod +x "$GIT_HOOKS_DIR/$hook_name"
+        echo "✓ $hook_name installed"
+    fi
+done
+
+echo ""
+echo "All hooks installed successfully!"

.githooks/pre-commit

@@ -0,0 +1,46 @@
+#!/bin/bash
+
+# Pre-commit hook to generate cv.webp from cv.pdf
+
+# Check if cv.pdf exists and is staged
+if git diff --cached --name-only | grep -q "^cv\.pdf$"; then
+    echo "cv.pdf is being committed, generating cv.webp..."
+
+    # Generate webp from first page of PDF
+    if [ -f "cv.pdf" ]; then
+        # Use pdftoppm to convert first page to PNG, then ImageMagick to convert to WebP
+        pdftoppm -png -f 1 -l 1 -singlefile cv.pdf temp_cv && \
+        magick temp_cv.png -quality 85 img/cv.webp && \
+        rm -f temp_cv.png
+
+        if [ $? -eq 0 ]; then
+            echo "Successfully generated img/cv.webp"
+            # Add the generated image to the commit
+            git add img/cv.webp
+        else
+            echo "Warning: Failed to generate cv.webp"
+            exit 1
+        fi
+    else
+        echo "Warning: cv.pdf not found, skipping cv.webp generation"
+    fi
+elif [ -f "cv.pdf" ]; then
+    # cv.pdf exists but is not being committed, check if it's newer than cv.webp
+    if [ ! -f "img/cv.webp" ] || [ "cv.pdf" -nt "img/cv.webp" ]; then
+        echo "cv.pdf has been modified but not staged. Generating cv.webp anyway..."
+
+        pdftoppm -png -f 1 -l 1 -singlefile cv.pdf temp_cv && \
+        magick temp_cv.png -quality 85 img/cv.webp && \
+        rm -f temp_cv.png
+
+        if [ $? -eq 0 ]; then
+            echo "Successfully generated img/cv.webp"
+            git add img/cv.webp
+        else
+            echo "Warning: Failed to generate cv.webp"
+            exit 1
+        fi
+    fi
+fi
+
+exit 0