[PR] fix(ai): preserve complete Markdown fence info strings [rocketmq-dashboard]

["pilichoumao (via GitHub)" <gi...@apache.org>]

pilichoumao opened a new pull request, #6880:
URL: https://github.com/apache/rocketmq-dashboard/pull/6880

   Fixes #6879.
   
   Valid AI Markdown such as a `shell` fence was rendered as `sh` code with `ell` inserted as the first line; `jsonc`, `json5` and language extensions had the same problem. Preserve fence info strings verbatim, while retaining code-body protection and the existing prose heading/list repairs. This applies to the common live/replayed text renderer.
   
   The compatibility choice is deliberate: remove the prefix heuristic that guessed a missing newline in strings such as `bashprintf`. Arbitrary info strings are valid Markdown, so an allowlist or a longer-first regex cannot reliably distinguish them from a command. The previous malformed-opener expectation now asserts preservation; its component fixture uses a properly separated command. The remaining code rendering assertions stay in place.
   
   Scope is three frontend files, with no dependencies, new UI strings or changes to stored answers. Related #6449 protects code bodies; #5730 addresses separate heading/thematic-break rules. Their source history (#5093 / #5089 / #5330) was reviewed; this fix covers info-string corruption left in the current normalizer.
   
   Validation:
   
   - Node 22 on macOS: 82 cases across the fence and actual AssistantBubble component suites passed. Restoring only the baseline normalizer made 35 of the same cases fail; the implementation was then restored.
   - Cases cover extended/unknown labels, metadata, case, LF/CRLF, idempotence of fenced text, unfinished streaming labels, and exact rendered code bytes in streaming and non-streaming modes.
   - ECS / Node 20.20.2: complete AI directory suite passed 305/305 across 21 files. Changed-file ESLint/formatting, all five license-tool tests, and `npm run build` passed (TypeScript, Vite and license gate: 132 actual components / 139 license files).
   - No live model, full frontend suite or browser session is claimed.
   
   AI assistance was used to investigate, implement and verify the change.
   


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