test: close coverage gaps to 99.88% line coverage

Five new test files cover branches the per-function suites missed: the day-wide notification pipeline, the jump-to-event navigation path (including the org-show-entry fallback for Org < 9.6), chime--stop's process-interrupt branch, chime--start's debug log, and the two async error branches in chime--fetch-and-process. The edge-coverage file mops up scattered one-line fallbacks: the day-wide-notification "today" path, the tooltip placeholder pass-through, timestamp-parse's no-context error message, log-silently's mid-line newline insert, the validation :error count, and record-async-failure's chime-debug hook.

Line coverage on chime.el goes from 97.1% to 99.88%, 823 of 824 coverable lines. The one remaining line is a pcase _ fallback the preceding regex can't reach.

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