OCL Web: hide Changelog icon for the first version of a source (no previous_version)

[filiperochalopes]

User story

As a user, I want the Versions UI to show the Changelog icon only when a version has a previous version so I don’t trigger an invalid comparison that causes errors.

Use case

Open the Versions list in OCL Web and navigate changelogs only for versions that can be compared to a prior version.

Requirements

• In OCL Web (frontend), display the Changelog icon only for versions that have a previous_version.
• Do not show the Changelog icon for the first version of a source (no previous_version).
• Prevent triggering changelog generation/comparison from the first version entry.

Acceptance criteria

• Given a source’s first version has no previous_version, the Versions list does not show a Changelog icon for that version.
• Given a version has previous_version, the Changelog icon is shown.
• Users cannot trigger a changelog action for the first version from the UI (avoiding processing errors).

More details (collapsible)

Context

• This is hard to reproduce locally because it tends to appear in sources with many versions; implement as a UI rule based on presence/absence of previous_version.
• Goal: avoid invalid compare/changelog calls for the first version (nothing to compare against).

[ocl-automation]

Automated Triage — 2026-05-14

Dimension	Score
Complexity	2
Scope	2
Clarity	4
Dependency	1
Risk	2

Decision: decision/ai-ready
Type: type/bug
Signals: signal/quick-win, signal/low-risk, signal/small-scope, signal/well-specified

Straightforward UI conditional logic change affecting version list component and changelog icon display. Clear requirements with specific acceptance criteria. Low risk since it only hides a UI element that currently causes errors.

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Generated by ticket-triage pipeline v3. Model: anthropic/claude-sonnet-4 (openrouter).