docs: update README with screenshots and new context stats and improved section titles

README.md

@@ -59,13 +59,22 @@ Open any session and click the **Context / 上下文** tab:
 
 The headline occupancy and composition read the **same official token-meter projections as the chat composer's context ring** (`contextPressure` / `contextBreakdown`), so the figures always match what the ring tells you.
 
-### 🧱 Current Context — who ate the budget
+### Context Stats
+
+#### Token Stats and Timing Stats
+![Token_Stats_and_Timing_Stats](https://raw.githubusercontent.com/bowenliang123/dsh-context/main/docs/token-stats-and-timing-stats.png)
+
+#### Context Stats
+![Context_Stats](https://raw.githubusercontent.com/bowenliang123/dsh-context/main/docs/context-stats.png)
+
+
+### 🧱 Current Context — what's in the context window now
 
 ![Current Context card](https://raw.githubusercontent.com/bowenliang123/dsh-context/main/docs/current-context.png)
 
 A six-color stacked bar against the model's full window (hatching = free headroom): system prompt, tool schemas, user messages, injected context, assistant replies, tool results — each with its ≈token figure and share. When a conversation starts degrading, this is where you see *which part* is responsible.
 
-### 📈 Context Trend — every request, sized and explained
+### 📈 Context Trend — how the context grew and evolved by turn or steps
 
 ![Context Trend with the step brief](https://raw.githubusercontent.com/bowenliang123/dsh-context/main/docs/context-trend.png)