Adds a third choice next to the existing single-file and per-day modes: a new
log file is created at every app start (process boot) and used until the app is
closed. A close → reopen of the app starts a new session, hence a new file.
File pattern: fileuploader-session-YYYY-MM-DD_HH-MM-SS-<pid>.log.
The boolean sessionLog field — misnamed: it actually toggled daily mode — is
replaced by a logMode enum: "single" | "daily" | "session". The misnomer made
the migration the trap to watch: existing users with sessionLog:true must land
on "daily", NOT "session". normalizeLogMode handles this and is unit-tested.
- lib/log-mode.js (new, pure, dual CJS/window export): normalizeLogMode +
resolveLogFileName + format helpers. No fs, no Date.now() at call time.
- config-store.js: normalize at the single load() boundary so downstream
readers consume logMode only. logMode is deliberately NOT seeded in DEFAULTS
(would beat the legacy migration after merge).
- main.js: stamp SESSION_ID once at process start (with pid hedge against
same-second restart collisions); getLogFilePath and buildFallbackLogName
switch on mode via the lib. _resolveUploadLogTarget cache key is now just
the primary path, which already encodes mode/date/session — self-invalidates.
- renderer: <select> with three German labels replaces the old checkbox;
saveSettings writes logMode; index.html loads the lib so window.LogMode is
available in renderSettings.
- Tests: 14 log-mode tests (incl. legacy-migration regression), 3 config-store
tests (defaults, legacy migration, round-trip all three values). 200/200.
End-to-end simulated locally: two launches → two distinct session files; PID
hedge produces distinct names even within the same second.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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