- Fetch and cache label colors from GitLab API for each project
- Use cached colors when displaying labels in MRs and Issues
- Fall back to default gray color (6e7681) when no color is available
- Handle both GitHub (no #) and GitLab (with #) color formats

- Fetch MR commits via GitLab API (projects/:id/merge_requests/:iid/commits)
- Fetch MR changed files via GitLab API (projects/:id/merge_requests/:iid/changes)
- Parse diff to count additions/deletions per file
- Show file change count in MR overview (from changes_count field)
- Commits tab now shows commit history with author and date
- Files Changed tab now shows list of modified files with +/- stats

Updated all commands to use glab instead of gh when in GitLab mode:

PR/MR operations:
- diff: glab mr diff
- checkout: glab mr checkout
- comment: glab mr note
- approve: glab mr approve
- assign/unassign: glab mr update --assignee/--unassign
- watch checks: glab ci status --live

Issue operations:
- close: glab issue close
- reopen: glab issue reopen
- comment: glab issue note
- assign/unassign: glab issue update --assignee/--unassign
- label: glab issue update --label/--unlabel

- Add Files field to EnrichedPullRequestData for GitLab
- Convert provider ChangedFiles to data ChangedFiles
- Update Files Changed tab to use enriched data when available
- Update overview to show correct files/commits count from enriched data
- Add GLAB_PAGER env var for glab mr diff command

- Use GitLab API endpoint (projects/:id/merge_requests/:iid/notes) instead of non-existent 'glab mr note list' command
- Filter out system-generated notes (commits, description changes, etc.)
- Update comment count to reflect actual user comments

Issue comments:
- Add FetchIssueComments to Provider interface
- Implement GitLab API call (projects/:id/issues/:iid/notes)
- Filter out system-generated notes
- Add enrichment mechanism to fetch comments when viewing an issue
- Handle IssueCommentsMsg in UI to update sidebar

Pagination:
- Add --page flag support to FetchPullRequests and FetchIssues
- Use EndCursor as page number (stored as string)
- Return next page number in EndCursor for subsequent fetches

The syncSidebar() function returns a tea.Cmd that fetches issue comments
for GitLab, but this command was not being executed in several places:

- onViewedRowChanged: was overwriting cmd with PR enrich only
- TogglePreview: was not using the returned cmd at all
- Text input handlers: were not batching the sync cmd

Fixed by:
- Using tea.Batch to combine syncSidebar cmd with other cmds
- Simplified EnrichIssueComments condition (always fetch if no nodes)

The bug was that after SetIssueComments updated the issue with fetched
comments, syncSidebar() was called which re-fetched the row data from
the section (without comments) and overwrote the updated data.

Fix: Just update the sidebar content directly instead of calling
syncSidebar() after setting comments.

Also added debug logging to FetchIssueComments for troubleshooting.

- Add getRepoFlag() helper to return '--repo' for GitLab, '-R' for GitHub
- Fix PRReady to use 'glab mr update --ready' for GitLab
- Fix UpdatePR to use 'glab mr rebase' for GitLab (instead of update-branch)
- Fix MergePR and CreatePR to use correct repo flag
- Update task messages to use MR label for GitLab
- Remove debug logging from FetchIssueComments

- Fetch pipeline jobs from GitLab API when enriching MR data
- Display pipeline jobs in the Checks tab with status icons
- Support both 'pipeline' and 'head_pipeline' fields from GitLab API
- Add PipelineJob struct to provider and data layers
- Calculate check stats from GitLab jobs for overview display