feat: add load average bar visualization (4/l hotkey)0.12.0

Adds a new teal bar type showing /proc/loadavg data per host.
The 1-min average fills from the top downward; yellow and white
1px reference lines mark the 5-min and 15-min averages. A global
loadPeak tracker (floor 2.0, slow per-frame decay) keeps the scale
meaningful across hosts and after spikes. Toggle with 4 or l;
persisted to ~/.loadbarsrc as showload=1.

Bump version to 0.12.0.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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