Fix layout flickering, workflow, and rename branch to main

- Add use_container_width=True to all st.pyplot calls to prevent layout oscillation

- Guard demo dataset re-loading to avoid redundant reads every rerun

- Fix keep-alive workflow: fetch-depth 0, proper HF remote auth

- Replace deprecated width=stretch with use_container_width on st.dataframe

- Acknowledge vibe-coding with Claude Code in README

.github/workflows/keep_alive.yml

@@ -10,6 +10,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
 
       - name: Generate heartbeat CSV
         run: |
@@ -32,4 +34,6 @@ jobs:
         env:
           HF_TOKEN: ${{ secrets.HF_TOKEN }}
         run: |
-          git push "https://fmegahed:${HF_TOKEN}@huggingface.co/spaces/fmegahed/timeseries_visualization" master:main --force
+          git remote add hf "https://fmegahed:${HF_TOKEN}@huggingface.co/spaces/fmegahed/timeseries_visualization" || \
+            git remote set-url hf "https://fmegahed:${HF_TOKEN}@huggingface.co/spaces/fmegahed/timeseries_visualization"
+          git push hf HEAD:main --force

README.md

@@ -26,3 +26,7 @@ interpretation.
 
 All data processing happens in-memory. No data is persisted to disk.
 Only chart PNG images (never raw data) are sent to the AI when you click "Interpret."
+
+## Acknowledgments
+
+This app was vibe-coded with [Claude Code](https://docs.anthropic.com/en/docs/claude-code).

app.py

@@ -260,7 +260,10 @@ with st.sidebar:
             st.session_state._upload_id = file_id
         st.caption(f"Detected delimiter: `{repr(st.session_state._upload_delim)}`")
     elif demo_choice != "(none)":
-        st.session_state.raw_df = _load_demo(_DEMO_FILES[demo_choice])
+        demo_key = ("demo", demo_choice)
+        if st.session_state.get("_upload_id") != demo_key:
+            st.session_state.raw_df = _load_demo(_DEMO_FILES[demo_choice])
+            st.session_state._upload_id = demo_key
     # else: keep whatever was already in session state
 
     raw_df: pd.DataFrame | None = st.session_state.raw_df
@@ -451,7 +454,7 @@ with tab_single:
         n_colors = max(12, len(y_cols))
         palette_colors = get_palette_colors(palette_name, n_colors)
         swatch_fig = render_palette_preview(palette_colors[:8])
-        st.pyplot(swatch_fig)
+        st.pyplot(swatch_fig, use_container_width=True)
 
         # Color-by control (for colored markers chart)
         color_by = None
@@ -589,7 +592,7 @@ with tab_single:
             st.error(f"Chart error: {exc}")
 
         if fig is not None:
-            st.pyplot(fig)
+            st.pyplot(fig, use_container_width=True)
 
     # ---- Summary stats expander -------------------------------------------
     with st.expander("Summary Statistics", expanded=False):
@@ -658,7 +661,7 @@ with tab_few:
                     style_dict=style_dict,
                     palette_colors=palette_b,
                 )
-                st.pyplot(fig_panel)
+                st.pyplot(fig_panel, use_container_width=True)
             except Exception as exc:
                 st.error(f"Panel chart error: {exc}")
 
@@ -676,7 +679,7 @@ with tab_few:
                         "trend_slope": "{:,.4f}",
                         "adf_pvalue": "{:.4f}",
                     }),
-                    width="stretch",
+                    use_container_width=True,
                 )
 
 # ===================================================================
@@ -726,6 +729,6 @@ with tab_many:
                     style_dict=style_dict,
                     palette_colors=palette_c,
                 )
-                st.pyplot(fig_spag)
+                st.pyplot(fig_spag, use_container_width=True)
             except Exception as exc:
                 st.error(f"Spaghetti chart error: {exc}")