feat(weather): prefer structured wttr.in format, harden cache and icons

- Use wttr.in structured format first (%l, %C, %t) for stable 3-line parsing
- Fallback to individual field requests when combined output omits temperature
- Keep ASCII fallback as last resort; best-effort extraction of loc/cond/temp
- Read/write cache via mapfile to avoid word splitting; validate temp line
- Normalize condition string; extend mapping and add substring icon heuristics
- Remove accidental double JSON print in default-case; ensure single output

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