no=op validation, and red tool error messages

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+# Changelog — 2026-03-28 / 05
+
+## No-op edit validation and tool error styling
+
+### No-op edit detection (`src/tools.ts`, `src/ollama-client.ts`)
+
+- `executeEditFile` now rejects calls where `old_text === new_text` immediately with an error, preventing unnecessary file operations.
+- Added `isNoOpEdit()` helper in `ollama-client.ts` that detects identical `old_text`/`new_text` for both `edit_file` and `batch_edit_file`.
+- The agent loop skips the user approval prompt for no-op edits — the tool executes directly and returns the error without interrupting the user.
+
+### Red accents for tool errors (`src/chat-view.ts`, `styles.css`)
+
+- `appendToolCall` now detects when `event.result` starts with `"Error"` and adds the `ai-pulse-tool-call-error` CSS class to the tool call container.
+- Added CSS rules for `.ai-pulse-tool-call-error` that change the border-left, header text, and result summary text from the default purple accent to red (`--text-error`).
+- Applies universally to all tool errors across every tool type.
+
+### Files changed
+
+- `src/tools.ts` — Added `oldText === newText` guard in `executeEditFile`.
+- `src/ollama-client.ts` — Added `isNoOpEdit()` function; updated approval condition in `chatAgentLoop`.
+- `src/chat-view.ts` — Added error class detection in `appendToolCall`.
+- `styles.css` — Added `.ai-pulse-tool-call-error` styling rules.