feat(org-agenda): raise file-cache TTL to 24h and bind S-<f8> force-refreshHEADmain

The agenda file-list cache held a 1h TTL, so once an hour the next agenda open re-walked projects-dir from scratch. That cache tracks only which files exist, never their contents, so task edits and completions are never staled by it. The only thing a long TTL delays is a new project's todo.org appearing. That's rare, so I raised it to 24h.

For that case I bound cj/org-agenda-refresh-files (the manual force-rescan) to S-<f8>, the free slot in the F8 agenda family (<f8>, s-<f8>, C-<f8>, M-<f8>).

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