refactor: extracted padding logic into reusable utility function with optimized buffer allocation

- Extracted manual space padding logic into a reusable `padding()` utility function across all UI components and utilities.
- Optimized padding operations by introducing a pre-allocated 512-space buffer in the `padding()` function to reduce repeated string allocations.
- Updated all imports across 30 files to use the new `padding()` function from pi-tui instead of inline `' '.repeat()` calls.
- Renamed local variables from `padding` to `pad`, `padSize`, `indent`, or `linePad` to avoid naming conflicts with the imported `padding()` function.
- Exported the `padding()` utility function from the tui package index for public use.

packages/coding-agent/src/modes/controllers/command-controller.ts

@@ -2,7 +2,7 @@ import * as fs from "node:fs/promises";
 import * as os from "node:os";
 import * as path from "node:path";
 import type { UsageLimit, UsageReport } from "@oh-my-pi/pi-ai";
-import { Loader, Markdown, Spacer, Text, visibleWidth } from "@oh-my-pi/pi-tui";
+import { Loader, Markdown, padding, Spacer, Text, visibleWidth } from "@oh-my-pi/pi-tui";
 import { $ } from "bun";
 import { nanoid } from "nanoid";
 import { loadCustomShare } from "../../export/custom-share";
@@ -773,7 +773,7 @@ function formatAccountHeader(limit: UsageLimit, report: UsageReport, index: numb
 function padColumn(text: string, width: number): string {
 	const visible = visibleWidth(text);
 	if (visible >= width) return text;
-	return `${text}${" ".repeat(width - visible)}`;
+	return `${text}${padding(width - visible)}`;
 }
 
 function resolveAggregateStatus(limits: UsageLimit[]): UsageLimit["status"] {