#6819: fix(tui): handle unstructured tool results and errors in tool execution output

This PR fixes a bug where the TUI displays no output when a tool returns an error or unstructured result (e.g., from a failed browser action or connection error). It updates [extractText](cci:1://file:///C:/Users/chenx/AppData/Roaming/npm/node_modules/openclaw/dist/tui/components/tool-execution.js:20:0-58:1) in [src/tui/components/tool-execution.ts](cci:7://file:///C:/Users/chenx/.gemini/antigravity/scratch/openclaw/src/tui/components/tool-execution.ts:0:0-0:0) to: - Check for `result.error` string. - Check for `result.message` string. - Check for `result.details.status` string. - Fallback to `JSON.stringify(result)` if no structured content is available. This ensures that error messages are visible to the user instead of a blank output block. <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> Updates the TUI tool-execution output rendering to be more resilient when tool results are missing structured `content`. `extractText` now handles unstructured results and common error shapes (`error`, `message`, `details.status`) and falls back to stringifying the raw object so users see something instead of a blank output block. This fits into the existing `ToolExecutionComponent.refresh()` flow, which derives the text to show from `extractText(this.result)` and then applies preview/expanded behavior for the markdown output. <h3>Confidence Score: 4/5</h3> - This PR is safe to merge with low risk; it’s a localized fallback improvement to tool result rendering. - Change is confined to `extractText` and adds defensive fallbacks without altering the surrounding rendering logic. Main concern is minor maintainability/type-safety due to an `any` cast on `details.status` and the possibility of very verbose JSON output for large objects. - src/tui/components/tool-execution.ts <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} **Context used:** - Context from `dashboard` - CLAUDE.md ([source](https://app.greptile.com/review/custom-context?memory=fd949e91-5c3a-4ab5-90a1-cbe184fd6ce8)) - Context from `dashboard` - AGENTS.md ([source](https://app.greptile.com/review/custom-context?memory=0d0c8278-ef8e-4d6c-ab21-f5527e322f13)) <!-- /greptile_comment -->