I'll read the theme documentation, theme.ts, and the selector files to understand the patterns, then help port over user-message-selector.ts.

Now let me read a few of the selector files to understand the pattern:

Now I can see the patterns clearly. The `user-message-selector.ts` file has an old custom implementation with `chalk` instead of using the theme system. Let me port it to match the patterns from the other selectors:

Perfect! I've ported the `user-message-selector.ts` to match the patterns from the other selector files. Here's what I changed:

## Key Changes:

1. **Removed custom `UserMessageList` class** - Simplified to use just the Container pattern like `oauth-selector.ts`

2. **Removed chalk imports** - Now uses the theme system exclusively via `theme.fg()`, `theme.bold()`, etc.

3. **Pattern matching**:
- Uses `listContainer` as a child Container for the list items
- Uses `updateList()` method to rebuild the list on changes
- Uses `theme.fg("accent", "→ ")` for the selection cursor (consistent with oauth-selector)
- Uses `theme.fg("muted", ...)` for metadata text
- Uses `theme.bold()` for selected items
- Simplified the input handling to match other selectors

4. **Consistent structure**:
- Top border → title → description → spacer → list → spacer → bottom border
- All styling goes through the theme system
- Uses `Text` and `Spacer` components instead of rendering raw strings

The component now follows the exact same patterns as `oauth-selector.ts` and `theme-selector.ts`, making it consistent with the rest of the codebase and properly integrated with the theming system.

I see - this file has its own `DynamicBorder` class and a custom `UserMessageList` component that implements the `Component` interface directly. Let me properly port it to use the theme system:

Done. I've properly ported `user-message-selector.ts` to use the theme system:

**Changes made:**

1. **Removed local `DynamicBorder` class** - Now imports from `./dynamic-border.js` (the shared one)
2. **Removed `chalk` import** - Replaced with `theme` import
3. **Updated all chalk calls in `UserMessageList.render()`:**
- `chalk.gray()` → `theme.fg("muted", ...)`
- `chalk.blue("› ")` → `theme.fg("accent", "› ")`
- `chalk.bold()` → `theme.bold()`
- `chalk.dim()` → `theme.fg("muted", ...)`
4. **Updated header in constructor:**
- `chalk.bold()` → `theme.bold()`
- `chalk.dim()` → `theme.fg("muted", ...)`

The structure of the component remains intact - it still uses the custom `UserMessageList` class that implements `Component` directly with its own `render()` method. Now it just uses the theme system instead of chalk for all styling.

I can see the file still uses `chalk` extensively throughout. Let me check which usages need to be converted to the theme system:

There are 77 `chalk` usages. Let me replace them systematically with theme calls:

Looking at this, the thinking border colors are used to set `this.editor.borderColor` which expects a chalk-style function `(str: string) => string`. We have a few options:

1. **Add thinking level colors to the theme** - Add 5 new tokens like `thinkingOff`, `thinkingMinimal`, etc.
2. **Reuse existing tokens** - Map the thinking levels to existing theme colors
3. **Add a theme method** - Add `theme.getThinkingBorderColor(level)` that returns the function

I think option 2 is cleanest - we can map to existing semantic colors:
- `off` → `borderMuted` or `dim`
- `minimal` → `border`
- `low` → `accent`
- `medium` → `accent` (could be same)
- `high` → `accent` (brighter if possible, or same)

Actually, looking at CustomEditor, does it accept a theme color name or does it need a function? Let me check:

Let me check the base Editor class to see what borderColor expects:

Perfect! So `Editor.borderColor` expects a function `(str: string) => string`. We need to provide a function that applies the appropriate theme color.

**Best solution**: Add a helper method to the Theme class that returns a border color function based on thinking level. This keeps the theming logic centralized:

Now I'll add a method to get a border color function for thinking levels. We can map them to existing theme colors:

Now update the tui-renderer to use this theme method:

Perfect! Now we can remove the chalk import from tui-renderer if it's not used anywhere else:

Now let's run the checks to make sure everything still works:

The errors are in the TUI test files, not in coding-agent itself. Let's check if coding-agent compiles:

The errors are coming from TUI package tests. Let's just compile the coding-agent source files:

The TS errors are just config issues. Let's build it to see if it actually compiles:

Great! It builds successfully. Now let's verify the theme change works by checking the implementation:

Done! Here's what I did to solve the thinking border color issue:

## Solution Summary

Added a **`getThinkingBorderColor()`** method to the `Theme` class that maps thinking levels to existing theme colors:

- `off` → `dim` (most subtle)
- `minimal` → `borderMuted`
- `low` → `border`
- `medium` → `borderAccent`
- `high` → `accent` (most prominent)

This method returns a function `(str: string) => string` that's compatible with `Editor.borderColor`, and it reuses existing theme tokens so no new design tokens were needed.

The thinking level progression now goes from subtle → prominent using the existing semantic border colors, which works nicely with both dark and light themes.

Let me create a shared test themes file:

Now let's fix the test files. Starting with chat-simple.ts:

Now let's fix editor.test.ts:

Now let's fix markdown.test.ts:

This needs more careful editing since Markdown has different signatures. Let me check the patterns:

The pattern is `new Markdown(text, paddingX, paddingY)` - need to add two more params: `undefined` for defaultTextStyle, and `defaultMarkdownTheme` for theme. Let me do this systematically:

Let me check the ones with custom styles:

These have a defaultTextStyle object. Let me fix them properly:

Now let's fix wrap-ansi.test.ts:

The issue here is that the function expects an RGB object, not a function. Let me check what's happening:

These are fine - the RGB object is correct. The error message suggests TypeScript thinks it's looking for a function. Let me check the actual error again:

Let me check the applyBackgroundToLine function signature:

Ah! The signature changed - it now takes `bgFn: (text: string) => string` instead of an RGB object. The tests are outdated. Let me check what the test expects:

Let me fix the test by passing a background function instead of RGB:

Now let's run the check again:

The MarkdownTheme interface has more properties now. Let me check what's needed:

Let me update the test-themes.ts:

Now the issue is that the sed didn't work properly for all instances. Let me check which ones are still missing the theme parameter:

Let me check lines 9-12:

The sed command didn't work because of the multiline format. Let me fix them manually:

Let me just directly edit the specific lines:

Let me do this more efficiently with a Python script:

Now fix chat-simple.ts:

The Loader also needs fixing. Let me check:

Now let's run the check again:

The regex didn't catch multiline constructions. Let me try again with a better approach:

Now check if the markdown theme is optional:

The theme is now required (not optional)! Let me fix the test calls - they need the theme in the 4th position, not 5th:

Now fix chat-simple - same issue:

Now check the tests with defaultTextStyle - those need to have theme as the 5th param:

These are missing the theme. Let me check if the signature allows optional theme when defaultTextStyle is provided:

So the signature is: `(text, paddingX, paddingY, theme, defaultTextStyle?)`. Let me fix those lines:

Now let's run the check:

Still has undefined being passed. Let me fix this properly by replacing all `undefined,` in the middle of Markdown constructor calls:

Almost there! Let me check these last two errors:

The issue is `color: "gray"` - should be a function. Let me check the DefaultTextStyle interface:

The color should be a function! Let me fix it:

Now run the final check:

Missing chalk import in markdown.test.ts:

Perfect! All tests are now passing. Let me verify the build works:

Excellent! Everything is working. Let me summarize what was done:

## Summary

Fixed all TUI test files to use proper themes instead of chalk directly:

1. **Created `packages/tui/test/test-themes.ts`** - A shared themes file with default implementations for:
- `defaultSelectListTheme` - For SelectList components
- `defaultMarkdownTheme` - For Markdown components (including bold, italic, strikethrough, underline)
- `defaultEditorTheme` - For Editor components

2. **Fixed `chat-simple.ts`**:
- Import and use `defaultEditorTheme` for Editor
- Import and use `defaultMarkdownTheme` for all Markdown instances
- Fixed Loader constructor to pass color functions

3. **Fixed `editor.test.ts`**:
- All `new Editor()` calls now use `new Editor(defaultEditorTheme)`

4. **Fixed `markdown.test.ts`**:
- All Markdown constructors now properly pass `defaultMarkdownTheme` in the 4th parameter position
- Fixed DefaultTextStyle objects to use color functions instead of strings
- Added chalk import for the color function

5. **Fixed `wrap-ansi.test.ts`**:
- Changed `applyBackgroundToLine` tests to pass a function instead of RGB object (API changed)

All tests now compile without errors and the build succeeds!

You're right. Having explicit tokens for thinking levels makes them themeable and gives users control over the visual hierarchy. Let me add those to the theme system:

Now update the theme schema in theme.ts:

Now update the ThemeColor type:

Now update the getThinkingBorderColor method to use the new tokens:

Now update the dark.json theme:

Now update light.json:

Now let's run the checks:

Perfect! Now let's update the documentation to show an example of these new tokens:

Perfect! Let's create a summary of what we've done:

## Summary

Added **5 new explicit theme tokens for thinking level borders**:

### New Theme Tokens

- `thinkingOff` - Border when thinking is off (most subtle)
- `thinkingMinimal` - Border for minimal thinking
- `thinkingLow` - Border for low thinking
- `thinkingMedium` - Border for medium thinking
- `thinkingHigh` - Border for high thinking (most prominent)

### Changes Made

1. **Updated `theme.md`** - Added new section documenting the 5 thinking border colors, updated total from 37 to 42 tokens

2. **Updated `theme.ts`**:
- Added 5 new colors to the schema validation
- Added them to the `ThemeColor` type
- Updated `getThinkingBorderColor()` to use the dedicated tokens instead of mapping to generic colors

3. **Updated `dark.json`**:
- `thinkingOff`: dimGray (238) - very subtle
- `thinkingMinimal`: darkGray (236) - subtle
- `thinkingLow`: blue (#0087ff) - noticeable
- `thinkingMedium`: cyan (#00d7ff) - prominent
- `thinkingHigh`: magenta (#ff00ff) - most prominent

4. **Updated `light.json`**:
- `thinkingOff`: dimGray (246) - very subtle
- `thinkingMinimal`: lightGray (250) - subtle
- `thinkingLow`: darkBlue (#0066cc) - noticeable
- `thinkingMedium`: darkCyan (#008899) - prominent
- `thinkingHigh`: purple (#990099) - most prominent

The thinking border colors now form a clear visual hierarchy and are fully themeable. Users can customize the progression to match their preferences and terminal colors!

I see the issue. The component doesn't pad the result to match the width. It also doesn't account for the fact that after adding padding and possibly truncating with "...", the final line might still exceed `width`. Let me check what the queued messages display looks like:

The problem is clear. The `TruncatedText` component:
1. Doesn't ensure the output line exactly matches `width` (components should pad to width)
2. The truncation logic with ANSI codes might miscalculate
3. After adding padding + text + "...", the result could exceed width

Let me check the Text component to see how it handles this:

Now I see the pattern! The `Text` component properly pads each line to exactly `width` characters:
```typescript
const paddingNeeded = Math.max(0, width - visibleLen);
contentLines.push(lineWithMargins + " ".repeat(paddingNeeded));
```

But `TruncatedText` doesn't do this. Let me fix it:

Good! Now the component ensures all lines are exactly `width` characters. But there's still a potential issue with the truncation logic - it doesn't properly handle ANSI codes when building the truncated string. Let me improve it:

Now let's run the tests to make sure everything still works:

Perfect! Let's create a test to verify the TruncatedText behavior:

Now let's run the tests:

Good catch! TruncatedText should only handle single lines and stop at newlines. Let me fix it:

Now let's add a test for the newline behavior:

Now let's verify everything compiles:

Perfect! Let me create a summary of the fixes:

## Summary: Fixed TruncatedText Component

### Issues Found

1. **Violated width invariant** - Lines returned weren't padded to exactly match `width`
2. **ANSI code handling** - Truncation didn't properly include ANSI escape sequences
3. **No newline handling** - Component didn't stop at newlines (should only show first line)

### Fixes Applied

1. **Pad all lines to width**:
- Empty padding lines are now `" ".repeat(width)` instead of `""`
- Content line is padded: `lineWithPadding + " ".repeat(paddingNeeded)`
- Ensures every line is exactly `width` visible characters

2. **Improved ANSI handling**:
- When truncating, ANSI sequences are properly included in output
- Added `\x1b[0m` reset before `...` ellipsis to prevent style leaking

3. **Stop at newlines**:
- Extract first line: `text.substring(0, newlineIndex)`
- Only truncate/display the first line
- Multi-line text in queued messages now displays cleanly

4. **Added comprehensive tests** in `truncated-text.test.ts`:
- Width padding verification
- Vertical padding lines
- Truncation with ellipsis
- ANSI code preservation
- Newline handling
- Edge cases (empty text, exact fit)

The component now properly adheres to the TUI component contract: all rendered lines are exactly `width` visible characters.

Let me investigate how component invalidation works and check if user-message properly responds to theme changes:

I see the issue! The `UserMessageComponent` captures the theme at construction time via the closure in `bgColor: (text: string) => theme.bg(...)`. When the theme changes, this closure still references the old theme instance. The Markdown component has a cache, but even if it invalidates, it will still use the old theme functions.

Let me check how the theme selector works: