feat: initial project setup with implementation plan

- Add PLAN.md with 40-step checklist across 10 phases
- Add CLAUDE.md with project-specific instructions
- Set up nix flake with FastHTML/MonsterUI dependencies
- Create Python package skeleton (src/animaltrack)
- Vendor FastHTML and MonsterUI documentation
- Add Docker build configuration

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/vendor/monsterui/examples/playground.md

@@ -0,0 +1,69 @@
+"""FrankenUI Playground Example built with MonsterUI (original design by ShadCN)"""
+
+from fasthtml.common import *
+from monsterui.all import *
+from fasthtml.svg import *
+
+app, rt = fast_app(hdrs=Theme.blue.headers())
+
+preset_options = ["Grammatical Standard English", "Summarize for a 2nd grader",
+        "Text to command","Q&A","English to other languages","Parse unstructured data",
+        "Classification","Natural language to Python","Explain code","Chat","More examples"]
+
+def playground_navbar():
+    save_modal = Modal(
+        ModalTitle("Save preset"),
+        P("This will save the current playground state as a preset which you can access later or share with others.",cls=("mt-1.5", TextPresets.muted_sm)),
+        LabelInput("Name",        id="name"), 
+        LabelInput("Description", id="description"),
+        ModalCloseButton("Save", cls=ButtonT.primary),
+        id="save")
+    
+    share_dd = Div(cls="space-y-6 p-4")(
+        H3("Share preset"),
+        P("Anyone who has this link and an OpenAI account will be able to view this.", cls=TextPresets.muted_sm),
+        Div(Input(value="https://platform.openai.com/playground/p/7bbKYQvsVkNmVb8NGcdUOLae?model=text-davinci-003", readonly=True),
+            Button(UkIcon('copy'), cls=(ButtonT.primary, "uk-drop-close",'mt-4'))))
+
+    rnav = (
+        Select(*Options(*preset_options), name='preset', optgroup_label="Examples",
+                 placeholder='Load a preset', searchable=True, cls='h-9 w-[200px] lg:w-[300px]'),
+        Button("Save",         cls=ButtonT.secondary, data_uk_toggle="#save"),save_modal,
+        Button("View Code",    cls=ButtonT.secondary),
+        Button("Share",        cls=ButtonT.secondary),DropDownNavContainer(share_dd),
+        Button(UkIcon(icon="ellipsis"), cls=ButtonT.secondary),
+        DropDownNavContainer(
+            Li(A("Content filter preferences")),
+            NavDividerLi(),
+            Li(A("Delete preset", cls="text-destructive")),
+        uk_dropdown="mode: click"))
+    
+    return NavBar(*rnav, brand=H4('Playground'))
+
+rsidebar = NavContainer(
+    Select(
+        Optgroup(map(Option,("text-davinci-003", "text-curie-001", "text-babbage-001", "text-ada-001")),label='GPT-3'),
+        Optgroup(map(Option,("code-davinci-002", "code-cushman-001")),label='Codex'),
+        label="Model",
+        searchable=True),
+    LabelRange(label='Temperature', value='12'),
+    LabelRange(label='Maximum Length', value='80'),
+    LabelRange(label='Top P', value='40'),
+    cls='space-y-6 mt-8')
+
+@rt
+def index(): 
+    navbar = playground_navbar()
+    main_content = Div(
+        Div(cls="flex-1")(
+            Textarea(cls="uk-textarea h-full p-4", placeholder="Write a tagline for an ice cream shop")),
+            cls="flex h-[700px] p-8 w-4/5")
+    
+    bottom_buttons = Div(
+        Button("Submit", cls=ButtonT.primary),
+        Button(UkIcon(icon="history"), cls=ButtonT.secondary),
+        cls="flex gap-x-2")
+    
+    return Title("Playground Example"),Div(navbar, Div(cls="flex w-full")(main_content, rsidebar), bottom_buttons)
+
+serve()