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

package-lock.json

@@ -54,7 +54,7 @@
         "vitest": "^4.0.17"
       },
       "engines": {
-        "node": ">=18.0.0"
+        "bun": ">=1.0.0"
       }
     },
     "node_modules/@ampproject/remapping": {
@@ -2678,9 +2678,9 @@
       "license": "MIT"
     },
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-      "version": "25.0.10",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-25.0.10.tgz",
-      "integrity": "sha512-zWW5KPngR/yvakJgGOmZ5vTBemDoSqF3AcV/LrO5u5wTWyEAVVh+IT39G4gtyAkh3CtTZs8aX/yRM82OfzHJRg==",
+      "version": "25.1.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-25.1.0.tgz",
+      "integrity": "sha512-t7frlewr6+cbx+9Ohpl0NOTKXZNV9xHRmNOvql47BFJKcEG1CxtxlPEEe+gR9uhVWM4DwhnvTF110mIL4yP9RA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -3468,9 +3468,9 @@
       "license": "MIT"
     },
     "node_modules/baseline-browser-mapping": {
-      "version": "2.9.18",
-      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.9.18.tgz",
-      "integrity": "sha512-e23vBV1ZLfjb9apvfPk4rHVu2ry6RIr2Wfs+O324okSidrX7pTAnEJPCh/O5BtRlr7QtZI7ktOP3vsqr7Z5XoA==",
+      "version": "2.9.19",
+      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.9.19.tgz",
+      "integrity": "sha512-ipDqC8FrAl/76p2SSWKSI+H9tFwm7vYqXQrItCuiVPt26Km0jS+NzSsBWAaBusvSbQcfJG+JitdMm+wZAgTYqg==",
       "license": "Apache-2.0",
       "bin": {
         "baseline-browser-mapping": "dist/cli.js"
@@ -5938,9 +5938,9 @@
       }
     },
     "node_modules/inquirer": {
-      "version": "13.2.1",
-      "resolved": "https://registry.npmjs.org/inquirer/-/inquirer-13.2.1.tgz",
-      "integrity": "sha512-kjIN+joqgbSncQJ6GfN7gV9AbDQlMA+hJ96xcwkQUwP9KN/ZIusoJ2mAfdt0LPrZJQsEyk5i/YrgJQTxSgzlPw==",
+      "version": "13.2.2",
+      "resolved": "https://registry.npmjs.org/inquirer/-/inquirer-13.2.2.tgz",
+      "integrity": "sha512-+hlN8I88JE9T3zjWHGnMhryniRDbSgFNJHJTyD2iKO5YNpMRyfghQ6wVoe+gV4ygMM4r4GzlsBxNa1g/UUZixA==",
       "license": "MIT",
       "dependencies": {
         "@inquirer/ansi": "^2.0.3",