feat(weather): URL-encode city, harden file handling, and produce safe JSON/cache output

- URL-encode city (python3 / jq / minimal sed fallback) and use encoded_city for all wttr.in calls
- Quote cachedir/cachefile usages and introduce a file variable for clarity
- Use portable stat (GNU/BSD fallback) and compute cache age robustly
- Replace brittle echo JSON with json_escape + printf to safely escape output
- Ensure .weather_cache is written as a two-line file with a proper trailing newline

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