Add average load

[andokalled-spec]

Summary of Changes Made Today

1. Analytics Dashboard: Average Total Load Chart Line
   File: analytics-dashboard.js
   Change: Added a dashed cyan line to the analytics dashboard chart to plot average total load values
   Details:
   Modified ensureChart() to add a 4th data series with label "Avg Total Load (${unit})" using a dashed line style (dash: [6, 6])
   Updated buildChartData() to compute and return per-day averages
   Modified chart initialization to support 4 data arrays instead of 3
2. Per-Day Average Calculations
   File: analytics-dashboard.js
   Change: Implemented per-day average load calculations for each exercise
   Details:
   buildSeriesForExercise() now accumulates per-workout averages by day
   For each day, computes the mean of all per-workout averages (rather than a global average)
   Tracks separate sums and counts for total, left, and right averages independently
   Prefers stored JSON fields (averageLoad, averageLoadLeft, averageLoadRight) when available; falls back to rep-derived calculations when absent
3. Update Averages for Old Workouts Feature
   Files: index.html, app.js
   Changes: Added new UI button and backend logic to backfill missing average fields in Dropbox workout files
   Details:
   Added "Update Avgs to Old Workouts" button in the Connection panel (below "Rebuild PRs to Dropbox")
   requestUpdateAveragesOldWorkouts(): User-facing method with confirmation prompt
   updateAveragesOldWorkouts(): Main logic that:
   Loads all workouts from Dropbox
   Checks for missing averageLoad, averageLoadLeft, averageLoadRight fields
   Calculates missing averages using calculateAverageLoadForWorkout()
   Uploads updated workouts back to Dropbox with status messages
4. Overwrite Existing Workout Files
   Files: dropbox.js, app.js
   Changes: Added method to overwrite existing Dropbox files instead of creating duplicates
   Details:
   Added overwriteWorkout() method in dropbox.js that:
   Uses _dropboxMetadata.path to identify original file location
   Uses mode: { ".tag": "overwrite" } to replace the existing file
   Preserves original filenames and Dropbox paths
   Updated updateAveragesOldWorkouts() to call overwriteWorkout() instead of saveWorkout() when updating old workouts
5. Average Calculation Logic
   File: app.js (existing completeWorkout())
   Note: Already computes and stores averageLoad, averageLoadLeft, averageLoadRight in new workouts via calculateAverageLoadForWorkout() between warmup end time and workout end time (excluding warmup 3 reps)

[averages are plotted for echo files]

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