Refactor: Extract helpers to eliminate duplication (89 lines)

[Copilot]

Extracted repeated patterns into focused helper functions to reduce duplication across error handling, HTTP header parsing, and UI updates.

Changes

Helper functions (7 added)

• parseHeaderInt - Consolidates header→int conversion (4 call sites)
• updateProgressStatus - Unifies rate limit + API status updates (8 call sites)
• Error handling suite: logErrorAndReturn, exitAfterDelay, handleFatalError, handlePullItemError, checkPreviousFailures

Simplified logic

• updateRateLimitInfo: Replaced 4 if-blocks with parseHeaderInt calls
• PopulateSearchTable: Extracted 3 identical index operations into indexTable closure
• ClearData: Switch statement → map lookup, unified deletion loop
• Item flag processing: Switch → map for boolean lookups
• Gradient colors: Extracted duplicate 6-color array to global

Example - Before/After error handling:

// Before: Repeated at 6+ call sites
if err != nil {
    progress.Log("Error: %v", err)
    time.Sleep(3 * time.Second)
    progress.Stop()
    os.Exit(1)
}

// After: Single call
if err != nil {
    handleFatalError(progress, "Error: %v", err)
}

5782 → 5693 lines. No functional changes.

Original prompt

Carefully inspect the code and look for opportunities to remove duplication or make it shorter and more concise without any loss of functionality.

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