fix(ui): honor explicit JSON log levels

[Kudala Bharani Kumar Reddy (kudala-bharani)]

Fixes #624.

JSON log lines now use their explicit level for coloring, so an info message such as {"level":"info","msg":"error count is zero"} no longer appears red. Recognized levels are case-insensitive, and warning maps to warn.

Plain text, malformed JSON, and missing or unsupported levels keep the existing text-based fallback. No dependencies or streaming behavior changed.

Added 20 regression cases covering conflicting message text, mixed-case levels, and fallback behavior. Six cases fail before the fix and pass afterward.

Verification:

• Log-viewer tests: 28 passed.
• Full UI suite: 1,142 passed across 126 files with Node 24.19.0 (node node_modules/vitest/vitest.mjs run).
• bun run lint and bun run build: passed (Bun 1.3.13).

The initial full-suite run on Node 25.9.0 hit 13 unrelated chat-store failures because its global localStorage lacked setItem. They pass on Node 24 without changing the chat code.

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[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-16T21:13:37.940131Z	59bd7da	PR opened

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[Sertaç Özercan (sozercan)]

LGTM

Kudala Bharani Kumar Reddy (@kudala-bharani) please sign the CLA when you get a chance