Update character assets and add matplotlib dependency

Re-indexes character image files in the static directory and adds matplotlib to the project dependencies to support font and image processing.

requirements.txt

@@ -16,26 +16,48 @@ click==8.3.1
     #   weeknotebot
 colorama==0.4.6 ; sys_platform == 'win32'
     # via click
+contourpy==1.3.3
+    # via matplotlib
+cycler==0.12.1
+    # via matplotlib
 feedparser==6.0.12
     # via
     #   fundor333-github-io
     #   weeknotebot
+fonttools==4.62.1
+    # via matplotlib
 idna==3.11
     # via requests
+kiwisolver==1.5.0
+    # via matplotlib
 lxml==6.0.2
     # via fundor333-github-io
 markdown-it-py==4.0.0
     # via rich
 marshmallow==3.26.2
     # via weeknotebot
+matplotlib==3.10.8
+    # via fundor333-github-io
 mdurl==0.1.2
     # via markdown-it-py
+numpy==2.4.4
+    # via
+    #   contourpy
+    #   matplotlib
 packaging==26.0
-    # via marshmallow
+    # via
+    #   marshmallow
+    #   matplotlib
 pillow==12.1.1
-    # via fundor333-github-io
+    # via
+    #   fundor333-github-io
+    #   matplotlib
 pygments==2.20.0
     # via rich
+pyparsing==3.3.2
+    # via matplotlib
+python-dateutil==2.9.0.post0
+    # via matplotlib
 python-dotenv==1.2.2
     # via fundor333-github-io
 python-frontmatter==1.1.0
@@ -56,6 +78,8 @@ sgmllib3k==1.0.0
     # via feedparser
 shellingham==1.5.4
     # via typer
+six==1.17.0
+    # via python-dateutil
 soupsieve==2.8.3
     # via beautifulsoup4
 typer==0.24.1