Fix filament usage aggregation and persistence

[pumpCurry]

Motivation

• Prevent filament remaining being reset to pre-print value when estimated length (materialLength) is initially NaN by changing progress-based estimation to an absolute calculation.
• Survive page reloads during a print by persisting internal filament-tracking variables so accumulated state is not lost.
• Avoid double/missing records and 0-length recordings by ensuring job ID resolution before finalizing and falling back to expected length when reported used length is empty.

Description

• Switched progress-based estimation from a delta accumulation to an absolute calculation (accumulatedUsedMaterial = (est * progress) / 100) so a later-known est will correct the accumulated value immediately; updated delta handling to avoid double-counting. (modified 3dp_lib/dashboard_aggregator.js)
• Persisted and restored filament-tracking internal variables to/from localStorage: accumulatedUsedMaterial, prevUsedMaterialLength, and prevUsageProgress via persistAggregatorState() and restoreAggregatorState(). (modified 3dp_lib/dashboard_aggregator.js)
• Ensured job ID resolution via resolveFilamentJobId() is applied before calling finalizeFilamentUsage() in both ingest/aggregation completion paths to reduce ID race conditions. (modified 3dp_lib/dashboard_aggregator.js)
• Hardened finalizeFilamentUsage() to guard against empty/zero recorded lengthMm by falling back to the spool's currentJobExpectedLength when available and logging a warning; uses the resolved value for history/logging. (modified 3dp_lib/dashboard_spool.js)
• Bumped file header @version / @lastModified metadata in the affected files.

Testing

• No automated tests were executed as part of this change.
• Changes were saved and committed (git commit) and basic repository operations completed without error.
• Manual runtime validation is recommended (start an external print, simulate delayed materialLength and page reloads, then finish/cancel) to confirm corrected aggregation and persistence behavior.

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Codex Task