fix(logging,config): logging and config robustness (review batch 4)

[Maxaubert]

Closes #419. Batch 4 of the 2026-10-09 review, Low section.

Fixed

• 68: rotation moves the base to a side name first (older generations stay intact if it is held), backs off when refused, and a failed log reopen is retried on the next write.
• 69: a testlog.txt older than a day is ignored with a Warn log, enabling it logs at Warn, and the telemetry file stops at 64 MiB.
• 70: SessionDiffers takes defaults for txSamplingMode, zoomEaseOutMs and lockApps from Config.
• 71: IniWriteLock (named mutex) and UpdateIniKeys in profiles_io.h; Settings setConfig, the flyout flush and the engine pick use them.
• 72: ParseConfig rejects NaN, inf, hex and trailing junk (default kept), strips a UTF-8 BOM, clampd maps NaN to the lower bound, trackGlideMs and txMaxStepPct are clamped.
• 73 and 90: device names are reserved with any extension ("con.x", "NUL.txt"), and the 40 limit counts characters, in C++ and in profileName.js.
• 74: per-process sentinel name with shared access, and ResolveIniPath is cached like ResolveLogDir.
• 76: stale "render" comment fixed and the model special case dropped from SessionDiffers (the core default is hybrid).
• 78: the diagnostics zip doubles U+2018-201B like the ASCII apostrophe.
• 86: a failed ini write keeps the flyout's changes pending with the bounded retry.
• 87: a still-pending flyout write is folded into the engine pick's locked write.
• 89: InitTrayBlock resets the pacing ring (and the stale menuOpen flag).

Skipped / partial

• 71 (partial): the tray profile switch and the Settings profile rename still do their own read-modify-write unlocked; they run on rarer, user-driven paths.
• 72 (partial): only integer keys with a clear range (trackGlideMs, txMaxStepPct) gained clamps; the rest need per-key ranges decided by their owners.

Tests

• build.bat test: [doctest] test cases: 604 | 604 passed | 0 failed, assertions: 97639 | 97639 passed | 0 failed
• build.bat and build.bat config: both exit 0 (Wind.exe, WindTray.exe, WindConfig.exe built).
• Playwright UI tests not run (batch 7 only); the profileName.js change is a two-line rule mirror.

No version bump: bumped at merge time.

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https://claude.ai/code/session_011zPmivSAQeivGUdBjTsaMu