Implement InputbarTools registry system for tool management

- Add ToolDefinition interface and registry mechanism with dependency injection
- Create InputbarToolsProvider for shared state management (files, mentionedModels, etc.)
- Migrate existing tools to registry-based definitions and simplify component props

src/renderer/src/pages/home/Inputbar/TODO.md

@@ -10,12 +10,34 @@ Create a single configurable input bar that supports chat topics, agent sessions
 - [ ] Define per-scope options (features toggles, placeholders, min/max rows, token counter, quick panel, attachments, knowledge picker, mention models, translate button, abort button, etc.).
 - [ ] Register defaults for chat (`TopicType.Chat`), agent session (`TopicType.Session`), and mini window scope.
 
-### 2. Shared UI Composer
+### 2. InputbarTools Registry System (NEW)
+- [ ] Create `ToolDefinition` interface with key, label, icon, condition, dependencies, and render function
+- [ ] Implement tool registration mechanism in `src/renderer/src/config/registry/inputbarTools.ts`
+- [ ] Create `InputbarToolsProvider` for shared state management (files, mentionedModels, knowledgeBases, etc.)
+- [ ] Define tool context interfaces (`ToolContext`, `ToolRenderContext`) for dependency injection
+- [ ] Migrate existing tools to registry-based definitions:
+  - [ ] new_topic tool
+  - [ ] attachment tool  
+  - [ ] thinking tool
+  - [ ] web_search tool
+  - [ ] url_context tool
+  - [ ] knowledge_base tool
+  - [ ] mcp_tools tool
+  - [ ] generate_image tool
+  - [ ] mention_models tool
+  - [ ] quick_phrases tool
+  - [ ] clear_topic tool
+  - [ ] toggle_expand tool
+  - [ ] new_context tool
+- [ ] Simplify InputbarTools component to use registry (reduce from 19 props to 3-5)
+- [ ] Integrate tool visibility/order configuration with InputbarScope
+
+### 3. Shared UI Composer
 - [ ] Extract common UI from `Inputbar.tsx` into new `InputComposer` component that reads config + callbacks.
 - [ ] Ensure composer handles textarea sizing, focus, drag/drop, token estimation, attachments, toolbar slots based on config.
 - [ ] Provide controlled props for text, files, mentioned models, loading states, quick panel interactions.
 
-### 3. Chat Wrapper Migration
+### 4. Chat Wrapper Migration
 - [ ] Refactor `Inputbar.tsx` to:
   - Resolve scope via topic type.
   - Fetch config via registry.
@@ -23,7 +45,7 @@ Create a single configurable input bar that supports chat topics, agent sessions
   - Remove inline UI duplication now covered by composer.
 - [ ] Verify chat-specific behaviour (knowledge save, auto translate, quick panel, model mentions) via config flags and callbacks.
 
-### 4. Agent Session Wrapper Migration
+### 5. Agent Session Wrapper Migration
 - [ ] Rebuild session input bar (currently `AgentSessionInputbar.tsx`) as thin wrapper using composer and session scope config.
 - [ ] Use session-specific hooks for message creation, model resolution, aborting, and streaming state.
 - [ ] Once parity confirmed, delete `AgentSessionInputbar.tsx` and update all imports.
@@ -42,3 +64,42 @@ Create a single configurable input bar that supports chat topics, agent sessions
 - Aligns with the approach taken for `MessageMenubar` scope registry.
 - Composer should accept refs for external focus triggers (e.g. `MessageGroup` or session auto-focus).
 - Plan to remove now-unused session-specific styles/components once migration completes.
+
+## Implementation Details
+
+### InputbarTools Registry Architecture
+**Problem**: Current InputbarTools has 19 props causing severe prop drilling and coupling.
+
+**Solution**: Registry-based tool system with dependency injection:
+
+```typescript
+// Tool Definition
+interface ToolDefinition {
+  key: string
+  label: string | ((t: TFunction) => string)
+  icon?: React.ComponentType
+  condition?: (context: ToolContext) => boolean
+  visibleInScopes?: InputbarScope[]
+  dependencies?: { hooks?, refs?, state? }
+  render: (context: ToolRenderContext) => ReactNode
+}
+
+// Context Provider for shared state
+InputbarToolsProvider manages:
+- files, mentionedModels, knowledgeBases states
+- setText, resizeTextArea actions
+- Tool refs management
+
+// Simplified Component Interface
+InputbarTools props reduced to:
+- scope: InputbarScope
+- assistantId: string  
+- onNewContext?: () => void
+```
+
+**Benefits**:
+- Decoupled tool definitions
+- Easy to add/remove tools per scope
+- Type-safe dependency injection
+- Maintains drag-drop functionality
+- Reduces component complexity from 19 to 3-5 props