Implement configurable vote limit to exclude screenshots after N votes

[Copilot]

Screenshots should be removed from the voting queue once they reach a threshold number of votes across all users.

Changes

• Voting logic (R/mod_voting.R): Added check in get_mutation() to skip screenshots where vote_count_total >= max_votes_per_screenshot. When all remaining screenshots exceed the limit, returns "done" state.

• Configuration (config.yaml files): Added max_votes_per_screenshot: 3 parameter with fallback default. Applied to all three config files (default template, runtime, test).

• Tests (test-voting-module.R): Added two tests covering partial skipping (some screenshots at limit) and complete skipping (all at limit). Tests set vote_count_total directly rather than relying on trigger behavior.

Implementation

# In get_mutation() loop checking unvoted screenshots:
max_votes <- cfg$max_votes_per_screenshot
if (is.null(max_votes)) max_votes <- 3

if (!is.null(df$vote_count_total) && 
    !is.na(df$vote_count_total) && 
    df$vote_count_total >= max_votes) {
  next  # Skip this screenshot
}

URL-based navigation (back button) unchanged—users can still review their previous votes regardless of current vote totals.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Modify number of times a screnshot is voted</issue_title>
<issue_description>Modify logic so that once a screenshot has been voted 3 times by any user, it is removed from the list of screenshots to be voted</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Modify number of times a screnshot is voted #64

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