feat: port upstream changes from pi-mono (6730b4fa..b74535dc)

Provider additions:
- Added Amazon Bedrock provider with bedrock-converse-stream API
- Added MiniMax provider with OpenAI-compatible API
- Added EU cross-region inference model variants for Bedrock

Provider fixes:
- Fixed Gemini CLI retries with header parsing and empty stream retry logic
- Fixed Bedrock tool call transforms via transformMessages
- Fixed z.ai thinking/reasoning params
- Fixed OpenRouter+Anthropic cache control
- Fixed OpenAI responses timeout and service tier options
- Fixed tool call ID normalization for cross-provider switches
- Fixed thought signature validation for Google providers
- Fixed prompt cache key using session ID

TUI improvements:
- Added OverlayOptions API with CSS-like positioning (SizeValue, percentages)
- Added OverlayHandle for programmatic visibility control
- Added visible callback for responsive overlays
- Added pad parameter to truncateToWidth
- Added pageUp/pageDown key support
- Fixed numbered list items showing 1. when code blocks break continuity
- Fixed overlay width overflow crash with complex ANSI sequences
- Fixed light theme colors for WCAG AA compliance

Coding agent fixes:
- Fixed /new command to create new session file
- Fixed session selector to stay open when folder has no sessions
- Added session header emission in JSON print mode
- Added queued message hint with theme.tree.hook
- Exported highlightCode and getLanguageFromPath for extensions

Also renamed transorm-messages.ts to transform-messages.ts (typo fix)

packages/tui/src/utils.ts

@@ -664,18 +664,20 @@ export function applyBackgroundToLine(line: string, width: number, bgFn: (text:
 
 /**
  * Truncate text to fit within a maximum visible width, adding ellipsis if needed.
+ * Optionally pad with spaces to reach exactly maxWidth.
  * Properly handles ANSI escape codes (they don't count toward width).
  *
  * @param text - Text to truncate (may contain ANSI codes)
  * @param maxWidth - Maximum visible width
- * @param ellipsis - Ellipsis string to append when truncating (default: "...")
- * @returns Truncated text with ellipsis if it exceeded maxWidth
+ * @param ellipsis - Ellipsis string to append when truncating (default: "…")
+ * @param pad - If true, pad result with spaces to exactly maxWidth (default: false)
+ * @returns Truncated text, optionally padded to exactly maxWidth
  */
-export function truncateToWidth(text: string, maxWidth: number, ellipsis: string = "..."): string {
+export function truncateToWidth(text: string, maxWidth: number, ellipsis: string = "…", pad: boolean = false): string {
 	const textVisibleWidth = visibleWidth(text);
 
 	if (textVisibleWidth <= maxWidth) {
-		return text;
+		return pad ? text + " ".repeat(maxWidth - textVisibleWidth) : text;
 	}
 
 	const ellipsisWidth = visibleWidth(ellipsis);
@@ -736,7 +738,12 @@ export function truncateToWidth(text: string, maxWidth: number, ellipsis: string
 	}
 
 	// Add reset code before ellipsis to prevent styling leaking into it
-	return `${result}\x1b[0m${ellipsis}`;
+	const truncated = `${result}\x1b[0m${ellipsis}`;
+	if (pad) {
+		const truncatedWidth = visibleWidth(truncated);
+		return truncated + " ".repeat(Math.max(0, maxWidth - truncatedWidth));
+	}
+	return truncated;
 }
 
 /**