v0.20.0: thinking blocks, chat windows overhaul, scroll fix

Backend:
- Add isThinking flag to agentEvent for text before tool calls
- Separate thinking from response text in runChatTurn and continue.go
- Persist thinking in a dedicated field in message content

Frontend:
- Add thinking field to MessageContent, ChatMessage, ChatTextEvent types
- Create ThinkingBlock.svelte — collapsible block with brain icon
- SSE handler moves text_delta content to thinking on isThinking flag
- Render thinking block between tools and response in ChatThread
- Fix chat window scroll reset on focus change (stable windowKeys order)
- Remove redundant #key id wrapper in WindowLayer
- Enlarge sidebar rail (24→32 default, 40→60 max)
- Remove glyph from sidebar, square graph at top
- Replace AgentTrace/ToolCallCard/UnifiedTimeline with TurnTrace/ToolLine

web/package-lock.json

@@ -8,6 +8,7 @@
       "name": "oikos-web",
       "version": "0.1.0",
       "dependencies": {
+        "@joan/procedural-glyph-engine": "file:../../../../../private/tmp/orby-pkg",
         "@surdeddd/wmkit": "^0.3.0",
         "clsx": "^2.1.1",
         "d3-force": "^3.0.0",
@@ -43,6 +44,14 @@
         "vitest": "^2.0.0"
       }
     },
+    "../../../../../private/tmp/orby-pkg": {
+      "name": "@joan/procedural-glyph-engine",
+      "version": "5.0.0",
+      "license": "SEE LICENSE IN LICENSE",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@asamuzakjp/css-color": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-3.2.0.tgz",
@@ -875,6 +884,10 @@
         "@swc/helpers": "^0.5.0"
       }
     },
+    "node_modules/@joan/procedural-glyph-engine": {
+      "resolved": "../../../../../private/tmp/orby-pkg",
+      "link": true
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",