diff --git a/src/automerge/AutomergeToTLStore.ts b/src/automerge/AutomergeToTLStore.ts
index ab04d5b..bd5e022 100644
--- a/src/automerge/AutomergeToTLStore.ts
+++ b/src/automerge/AutomergeToTLStore.ts
@@ -1,6 +1,52 @@
-import { TLRecord, RecordId, TLStore } from "@tldraw/tldraw"
+import { TLRecord, RecordId, TLStore, IndexKey } from "@tldraw/tldraw"
 import * as Automerge from "@automerge/automerge"
 
+// Helper function to validate if a string is a valid tldraw IndexKey
+// tldraw uses fractional indexing based on https://observablehq.com/@dgreensp/implementing-fractional-indexing
+// Valid indices have an integer part (letter indicating length) followed by digits and optional alphanumeric fraction
+// Examples: "a0", "a1", "a1V", "a24sT", "a1V4rr"
+// Invalid: "b1" (old format), simple sequential numbers
+function isValidIndexKey(index: string): boolean {
+  if (!index || typeof index !== 'string' || index.length === 0) {
+    return false
+  }
+
+  // The first character indicates the integer part length:
+  // 'a' = 1 digit, 'b' = 2 digits, etc. for positive integers
+  // 'Z' = 1 digit, 'Y' = 2 digits, etc. for negative integers
+  // But for normal shapes, 'a' followed by a digit is the most common pattern
+
+  // Simple invalid patterns that are definitely wrong:
+  // - Just a number like "1", "2"
+  // - Old format like "b1", "c1" (letter + single digit that's not a valid fractional index)
+  // - Empty or whitespace
+
+  // Valid fractional indices from tldraw start with 'a' for small positive numbers
+  // and follow with digits + optional alphanumeric jitter
+  // Pattern: starts with 'a', followed by at least one digit, then optional alphanumeric chars
+
+  // Simple patterns that are DEFINITELY invalid for tldraw:
+  // "b1", "c1", "d1" etc - these are old non-fractional indices
+  if (/^[b-z]\d$/i.test(index)) {
+    return false
+  }
+
+  // Valid tldraw indices should start with lowercase 'a' followed by digits
+  // and optionally more alphanumeric characters for the fractional part
+  // Examples from actual tldraw: "a0", "a1", "a24sT", "a1V4rr"
+  if (/^a\d/.test(index)) {
+    return true
+  }
+
+  // Also allow 'Z' prefix for very high indices (though rare)
+  if (/^Z[a-z]/i.test(index)) {
+    return true
+  }
+
+  // If none of the above, it's likely invalid
+  return false
+}
+
 export function applyAutomergePatchesToTLStore(
   patches: Automerge.Patch[],
   store: TLStore,
diff --git a/src/lib/clientConfig.ts b/src/lib/clientConfig.ts
index 7a341f1..b3922bf 100644
--- a/src/lib/clientConfig.ts
+++ b/src/lib/clientConfig.ts
@@ -93,67 +93,71 @@ export function getClientConfig(): ClientConfig {
   }
 }
 
+// Default RunPod API key - shared across all endpoints
+// This allows all users to access AI features without their own API keys
+const DEFAULT_RUNPOD_API_KEY = 'rpa_YYOARL5MEBTTKKWGABRKTW2CVHQYRBTOBZNSGIL3lwwfdz'
+
+// Default RunPod endpoint IDs (from CLAUDE.md)
+const DEFAULT_RUNPOD_IMAGE_ENDPOINT_ID = 'tzf1j3sc3zufsy'   // Automatic1111 for image generation
+const DEFAULT_RUNPOD_VIDEO_ENDPOINT_ID = '4jql4l7l0yw0f3'   // Wan2.2 for video generation
+const DEFAULT_RUNPOD_TEXT_ENDPOINT_ID = '03g5hz3hlo8gr2'    // vLLM for text generation
+const DEFAULT_RUNPOD_WHISPER_ENDPOINT_ID = 'lrtisuv8ixbtub' // Whisper for transcription
+
 /**
  * Get RunPod configuration for API calls (defaults to image endpoint)
+ * Falls back to pre-configured endpoints if not set via environment
  */
 export function getRunPodConfig(): { apiKey: string; endpointId: string } | null {
   const config = getClientConfig()
 
-  if (!config.runpodApiKey || !config.runpodEndpointId) {
-    return null
-  }
+  const apiKey = config.runpodApiKey || DEFAULT_RUNPOD_API_KEY
+  const endpointId = config.runpodEndpointId || config.runpodImageEndpointId || DEFAULT_RUNPOD_IMAGE_ENDPOINT_ID
 
   return {
-    apiKey: config.runpodApiKey,
-    endpointId: config.runpodEndpointId
+    apiKey: apiKey,
+    endpointId: endpointId
   }
 }
 
 /**
  * Get RunPod configuration for image generation
+ * Falls back to pre-configured Automatic1111 endpoint
  */
 export function getRunPodImageConfig(): { apiKey: string; endpointId: string } | null {
   const config = getClientConfig()
-  const endpointId = config.runpodImageEndpointId || config.runpodEndpointId
 
-  if (!config.runpodApiKey || !endpointId) {
-    return null
-  }
+  const apiKey = config.runpodApiKey || DEFAULT_RUNPOD_API_KEY
+  const endpointId = config.runpodImageEndpointId || config.runpodEndpointId || DEFAULT_RUNPOD_IMAGE_ENDPOINT_ID
 
   return {
-    apiKey: config.runpodApiKey,
+    apiKey: apiKey,
     endpointId: endpointId
   }
 }
 
 /**
  * Get RunPod configuration for video generation
+ * Falls back to pre-configured Wan2.2 endpoint
  */
 export function getRunPodVideoConfig(): { apiKey: string; endpointId: string } | null {
   const config = getClientConfig()
 
-  if (!config.runpodApiKey || !config.runpodVideoEndpointId) {
-    return null
-  }
+  const apiKey = config.runpodApiKey || DEFAULT_RUNPOD_API_KEY
+  const endpointId = config.runpodVideoEndpointId || DEFAULT_RUNPOD_VIDEO_ENDPOINT_ID
 
   return {
-    apiKey: config.runpodApiKey,
-    endpointId: config.runpodVideoEndpointId
+    apiKey: apiKey,
+    endpointId: endpointId
   }
 }
 
 /**
  * Get RunPod configuration for text generation (vLLM)
- * Falls back to pre-configured RunPod endpoints if not set via environment
+ * Falls back to pre-configured vLLM endpoint
  */
 export function getRunPodTextConfig(): { apiKey: string; endpointId: string } | null {
   const config = getClientConfig()
 
-  // Default RunPod configuration for text generation
-  // These are pre-configured endpoints that all users can use
-  const DEFAULT_RUNPOD_API_KEY = 'rpa_YYOARL5MEBTTKKWGABRKTW2CVHQYRBTOBZNSGIL3lwwfdz'
-  const DEFAULT_RUNPOD_TEXT_ENDPOINT_ID = '03g5hz3hlo8gr2'
-
   const apiKey = config.runpodApiKey || DEFAULT_RUNPOD_API_KEY
   const endpointId = config.runpodTextEndpointId || DEFAULT_RUNPOD_TEXT_ENDPOINT_ID
 
@@ -165,17 +169,17 @@ export function getRunPodTextConfig(): { apiKey: string; endpointId: string } |
 
 /**
  * Get RunPod configuration for Whisper transcription
+ * Falls back to pre-configured Whisper endpoint
  */
 export function getRunPodWhisperConfig(): { apiKey: string; endpointId: string } | null {
   const config = getClientConfig()
 
-  if (!config.runpodApiKey || !config.runpodWhisperEndpointId) {
-    return null
-  }
+  const apiKey = config.runpodApiKey || DEFAULT_RUNPOD_API_KEY
+  const endpointId = config.runpodWhisperEndpointId || DEFAULT_RUNPOD_WHISPER_ENDPOINT_ID
 
   return {
-    apiKey: config.runpodApiKey,
-    endpointId: config.runpodWhisperEndpointId
+    apiKey: apiKey,
+    endpointId: endpointId
   }
 }