feat: add Sequestr logo, statement, and LaTeX model equation to dashboard header

dashboard/app.py

@@ -154,10 +154,25 @@ def hex_to_rgba(hex_color, alpha):
 # Gradio UI code starts here
 with gr.Blocks() as demo:
     gr.Markdown("""
+    <div style='display: flex; align-items: center; gap: 16px;'>
+        <img src='file/dashboard/sequestr_logo.png' alt='Sequestr Logo' style='height:48px;'>
+        <div>
+            <b>This tool is provided by <a href='https://www.sequestr.io/' target='_blank'>Sequestr</a>.</b><br>
+            <span style='color: #d9534f;'>Please do not share this page.</span>
+        </div>
+    </div>
+    """, elem_id="sequestr-header")
+    gr.Markdown("""
 # Declining Increment Model
 
-**Growth Model:** Annual increment declines linearly to zero; total size is the sum of non-negative increments. No negative growth: DBH and height never decrease. Mortality is compounded annually according to the schedule in the config. Continuous mode uses the analytical formula:  
-\( \text{size}(t) = \text{initial} + r_0 \cdot (t - \frac{t^2}{2T_m}) \)  
+**Growth Model:** Annual increment declines linearly to zero; total size is the sum of non-negative increments. No negative growth: DBH and height never decrease. Mortality is compounded annually according to the schedule in the config.
+
+**Continuous mode uses the analytical formula:**
+
+$$
+\text{size}(t) = \text{initial} + r_0 \cdot \left(t - \frac{t^2}{2T_m}\right)
+$$
+
 This version is smoother and may yield slightly different results than the discrete sum, especially for short time periods or small Tm.
 
 *Species are displayed as "Rhizophora spp." and "Avicennia germinans" throughout the dashboard for clarity.*