[repo-assist] fix(diff): add --no-pager and package header to git diff (#1243)

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🤖 This is an automated pull request from Repo Assist.

Summary

Fixes the inconsistent pagination of PKGBUILD diffs when reviewing multiple packages (issue #1243).

Root cause: showPkgbuildDiffs called cmdBuilder.Show() with a bare git diff command for each package. git by default invokes a pager (e.g. less) when output exceeds the terminal height, but does not invoke it for short diffs. This caused different packages to behave differently: large diffs opened less individually, small diffs just scrolled past.

Changes

• Add --no-pager before diff in the git args. This prevents git from opening its own pager per package; all diffs now stream consistently to stdout regardless of length.
• Print a package name header (==> Showing diff for <pkg>) before each diff. When reviewing multiple packages, users can now clearly see where each package's diff begins.

Trade-offs

• Diffs from all packages now scroll to the terminal. Users who want to page through the combined output can set PAGER=less or pipe yay through a pager. This is consistent, predictable behaviour compared to the current inconsistent per-diff paging.
• The maintainer has noted a jguer/skip-confirmed-confirms branch exploring config-driven behaviour; the --no-pager approach is the simplest fix and doesn't conflict with that work.

Test Status

⚠️ Infrastructure limitation: the workflow runner has Go 1.25 but the module requires Go ≥ 1.26, so automated build and test could not be run. The change is small (3 lines): adding "--no-pager" to an existing string slice and adding one logger.Println call. Both are consistent with surrounding code patterns.

Closes #1243

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