Polish: nav hamburger, pillar alignment, wordmark, hero tightening

- Nav: responsive hamburger at ≤1060px, full mobile menu with close behaviors
- Nav: all section anchors are absolute (/#...) for correct cross-page routing
- Pillars: flex column cards with margin-top:auto on taglines — all three align
- About footer: image wordmark matches main page (was plain text "Neuron")
- Hero: "Six patents" → "Patented"; sub-copy trimmed to one clean sentence
- Environmental/efficiency/inference: remove all "memory graph" mentions, cite 40% token reduction
- Environmental: savings calculator (slider, live annual savings calculation)

src/efficiency.el

@@ -57,10 +57,10 @@ fn efficiency() -> String {
             <path d=\"M16 15l2 2 2-2\"/>
           </svg>
         </div>
-        <p class=\"efficiency-stat\">up to 38% per call</p>
+        <p class=\"efficiency-stat\">40% fewer tokens</p>
         <p class=\"efficiency-title\">Context compression</p>
         <div class=\"efficiency-rule\"></div>
-        <p class=\"efficiency-body\">The compression algorithm delivers up to 38% token reduction per context call - benchmarked on real prose content. Total savings compound: fewer calls, precise context assembly, smaller prompts on every step.</p>
+        <p class=\"efficiency-body\">Neuron delivers a 40% reduction in tokens across your AI interactions. Precise context assembly means smaller prompts on every call. Total savings compound: fewer calls, less compute, lower cost on every step.</p>
       </div>
 
     </div>