Add debug log panel, centered modals, and fix multiple UX issues

Features:
  - Add /logs command to toggle debug log panel (20% width on right)
  - Debug panel shows API calls, streaming events, tool calls, state changes
  - Add /help submenus with detailed command explanations
  - Center all modal dialogs in the terminal window

  Bug Fixes:
  - Fix streaming content not displaying (add fallback when streaming fails)
  - Fix permission modal shortcut key mismatch ('a' → 'l' for local scope)
  - Fix agent prompt accumulation when switching agents multiple times
  - Fix permission modal using brittle index for "No" option

  Improvements:
  - Restrict git commands (add, commit, push, etc.) unless user explicitly requests
  - Unify permission options across all UI components
  - Add Ollama model selection when switching to Ollama provider
  - Store base system prompt to prevent agent prompt stacking

  New files:
  - src/tui-solid/components/debug-log-panel.tsx
  - src/tui-solid/components/centered-modal.tsx
  - src/tui-solid/components/help-menu.tsx
  - src/tui-solid/components/help-detail.tsx
  - src/constants/help-content.ts

src/constants/chat-service.ts

@@ -103,4 +103,5 @@ export type CommandName =
   | "p"
   | "status"
   | "remember"
-  | "learnings";
+  | "learnings"
+  | "logs";

src/constants/help-content.ts

@@ -0,0 +1,182 @@
+/**
+ * Help Content Constants
+ *
+ * Detailed help information for commands and features
+ */
+
+export interface HelpTopic {
+  id: string;
+  name: string;
+  shortDescription: string;
+  fullDescription: string;
+  usage?: string;
+  examples?: string[];
+  shortcuts?: string[];
+  category: HelpCategory;
+}
+
+export type HelpCategory = "commands" | "files" | "shortcuts";
+
+export const HELP_CATEGORIES: Array<{
+  id: HelpCategory;
+  name: string;
+  description: string;
+}> = [
+  {
+    id: "commands",
+    name: "Commands",
+    description: "Slash commands for controlling the assistant",
+  },
+  {
+    id: "files",
+    name: "File References",
+    description: "How to reference and work with files",
+  },
+  {
+    id: "shortcuts",
+    name: "Shortcuts",
+    description: "Keyboard shortcuts",
+  },
+];
+
+export const HELP_TOPICS: HelpTopic[] = [
+  // Commands
+  {
+    id: "help",
+    name: "/help",
+    shortDescription: "Show this help menu",
+    fullDescription:
+      "Opens the help menu where you can browse commands and features.",
+    usage: "/help",
+    category: "commands",
+  },
+  {
+    id: "clear",
+    name: "/clear",
+    shortDescription: "Clear conversation",
+    fullDescription: "Clears the conversation history from the screen.",
+    usage: "/clear",
+    category: "commands",
+  },
+  {
+    id: "save",
+    name: "/save",
+    shortDescription: "Save session",
+    fullDescription: "Saves the current conversation session.",
+    usage: "/save",
+    category: "commands",
+  },
+  {
+    id: "model",
+    name: "/model",
+    shortDescription: "Select AI model",
+    fullDescription: "Opens menu to select which AI model to use.",
+    usage: "/model",
+    category: "commands",
+  },
+  {
+    id: "provider",
+    name: "/provider",
+    shortDescription: "Switch provider",
+    fullDescription: "Switch between LLM providers (Copilot, Ollama).",
+    usage: "/provider",
+    category: "commands",
+  },
+  {
+    id: "mode",
+    name: "/mode",
+    shortDescription: "Switch mode",
+    fullDescription:
+      "Switch between Agent (full access), Ask (read-only), and Code Review modes.",
+    usage: "/mode",
+    shortcuts: ["Ctrl+Tab"],
+    category: "commands",
+  },
+  {
+    id: "theme",
+    name: "/theme",
+    shortDescription: "Change theme",
+    fullDescription: "Opens menu to select a color theme.",
+    usage: "/theme",
+    category: "commands",
+  },
+  {
+    id: "exit",
+    name: "/exit",
+    shortDescription: "Exit application",
+    fullDescription: "Exits CodeTyper. You can also use Ctrl+C twice.",
+    usage: "/exit",
+    shortcuts: ["Ctrl+C twice"],
+    category: "commands",
+  },
+  {
+    id: "logs",
+    name: "/logs",
+    shortDescription: "Toggle debug logs",
+    fullDescription:
+      "Toggles the debug log panel on the right side of the screen. Shows API calls, streaming events, tool calls, and internal state changes for debugging.",
+    usage: "/logs",
+    category: "commands",
+  },
+
+  // Files
+  {
+    id: "file-ref",
+    name: "@file",
+    shortDescription: "Reference a file",
+    fullDescription:
+      "Type @ to open file picker and include file content in context.",
+    usage: "@filename",
+    examples: ["@src/index.ts", "@package.json"],
+    category: "files",
+  },
+  {
+    id: "file-glob",
+    name: "@pattern",
+    shortDescription: "Reference multiple files",
+    fullDescription: "Use glob patterns to reference multiple files.",
+    usage: "@pattern",
+    examples: ["@src/**/*.ts", "@*.json"],
+    category: "files",
+  },
+
+  // Shortcuts
+  {
+    id: "shortcut-slash",
+    name: "/",
+    shortDescription: "Open command menu",
+    fullDescription: "Press / when input is empty to open command menu.",
+    shortcuts: ["/"],
+    category: "shortcuts",
+  },
+  {
+    id: "shortcut-at",
+    name: "@",
+    shortDescription: "Open file picker",
+    fullDescription: "Press @ to open the file picker.",
+    shortcuts: ["@"],
+    category: "shortcuts",
+  },
+  {
+    id: "shortcut-ctrlc",
+    name: "Ctrl+C",
+    shortDescription: "Cancel/Exit",
+    fullDescription: "Press once to cancel, twice to exit.",
+    shortcuts: ["Ctrl+C"],
+    category: "shortcuts",
+  },
+  {
+    id: "shortcut-ctrltab",
+    name: "Ctrl+Tab",
+    shortDescription: "Cycle modes",
+    fullDescription: "Cycle through interaction modes.",
+    shortcuts: ["Ctrl+Tab"],
+    category: "shortcuts",
+  },
+];
+
+export const getTopicsByCategory = (category: HelpCategory): HelpTopic[] =>
+  HELP_TOPICS.filter((topic) => topic.category === category);
+
+export const getTopicById = (id: string): HelpTopic | undefined =>
+  HELP_TOPICS.find((topic) => topic.id === id);

src/constants/tui-components.ts

@@ -47,6 +47,8 @@ export const MODE_DISPLAY_CONFIG: Record<string, ModeDisplayConfig> = {
   mode_select: { text: "Select Mode", color: "magenta" },
   provider_select: { text: "Select Provider", color: "magenta" },
   learning_prompt: { text: "Save Learning?", color: "cyan" },
+  help_menu: { text: "Help", color: "cyan" },
+  help_detail: { text: "Help Detail", color: "cyan" },
 } as const;
 
 export const DEFAULT_MODE_DISPLAY: ModeDisplayConfig = {
@@ -199,6 +201,7 @@ export const SLASH_COMMANDS: SlashCommand[] = [
   },
   { name: "theme", description: "Change color theme", category: "settings" },
   { name: "mcp", description: "Manage MCP servers", category: "settings" },
+  { name: "logs", description: "Toggle debug log panel", category: "settings" },
 
   // Account commands
   {