Mermaid diagram fixes (#80)

Fixes mermaid diagrams in 3 files

Author: ihsraham

docs/protocol/off-chain/app-sessions.mdx

@@ -250,13 +250,13 @@ When an <Tooltip content={tooltipDefinitions.appChannel}>app session</Tooltip> i
 
 ```mermaid
 graph TB
-    A[Alice's Unified Account<br/>Balance: 200 USDC] 
+    A["Alice's Unified Account<br/>Balance: 200 USDC"] 
     
-    B[Create App Session<br/>Alice transfers 100 USDC]
+    B["Create App Session<br/>Alice transfers 100 USDC"]
     
-    C[Alice's Unified Account<br/>Balance: 100 USDC]
+    C["Alice's Unified Account<br/>Balance: 100 USDC"]
     
-    D[App Session Account<br/>Balance: 100 USDC<br/>(Beneficiary: Alice)]
+    D["App Session Account<br/>Balance: 100 USDC<br/>(Beneficiary: Alice)"]
     
     A -->|create_app_session| B
     B --> C

docs/protocol/off-chain/channel-methods.mdx

@@ -22,7 +22,7 @@ Payment channels are the foundation of the Nitrolite protocol. They lock funds o
 stateDiagram-v2
     [*] --> Requesting: create_channel (off-chain)
     Requesting --> OnChain: User submits create() transaction
-    OnChain --> ACTIVE: Contract locks user funds (status: open)
+    OnChain --> ACTIVE: Contract locks user funds (status = open)
 
     ACTIVE --> Resizing: resize_channel (optional)
     Resizing --> ACTIVE: User submits resize() transaction
@@ -31,7 +31,8 @@ stateDiagram-v2
     Closing --> [*]: Funds distributed
 
     ACTIVE --> Disputing: challenge() (non-cooperative)
-    Disputing --> [*]: Challenge period → close()
+    Disputing --> [*]: Challenge period then close()
+
 
 ```
 

docs/protocol/on-chain/security.mdx

@@ -76,17 +76,18 @@ The security of <Tooltip content={tooltipDefinitions.nitroliteProtocol}>Nitrolit
 
 ```mermaid
 graph TB
-    A[User has latest<br/>signed state] --> B{Other participant responsive?}
-    B -->|Yes| C[Cooperative close<br/>Fast & cheap]
-    B -->|No| D[Challenge with<br/>latest state]
-    D --> E[Wait challenge<br/>period]
-    E --> F{Communication continuation suggested?}
-    F -->|No| G[Close & recover funds]
-    F -->|Yes| H[Create and submit a<br/>newer state via `checkpoint(...)`]
+    A["User has latest<br/>signed state"] --> B{"Other participant responsive?"}
+    B -->|Yes| C["Cooperative close<br/>Fast & cheap"]
+    B -->|No| D["Challenge with<br/>latest state"]
+    D --> E["Wait challenge<br/>period"]
+    E --> F{"Communication continuation suggested?"}
+    F -->|No| G["Close & recover funds"]
+    F -->|Yes| H["Create and submit a<br/>newer state via checkpoint(...)"]
     H --> E
     
     style C fill:#90EE90
     style G fill:#90EE90
+
 ```
 
 ### State Validity