Refactor pull request view (6)

[wxiaoguang]

Clean up legacy logic.

• Use backend logic to choose PR timeline icon color
• Always use the Vue form to merge, remove the "StillCanManualMerge" logic

[wxiaoguang]

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[Copilot]

Pull request overview

This PR continues the pull request view refactor by moving more merge-box state/decision logic to the backend and consolidating PR status/merge UI templates around reusable components.

Changes:

• Moves PR timeline icon color selection and some merge-box state into backend-prepared data.
• Replaces legacy/manual merge-box branches with the Vue merge form and shared status-check partials.
• Simplifies flex-list/segment styling to support the refactored PR merge/status layouts.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
web_src/js/features/repo-issue-pull.ts	Keeps PR update action logic, only adds a TODO about non-JSON responses.
web_src/js/components/PullRequestMergeForm.vue	Adjusts merge button coloring/layout and keeps all merge actions in the Vue form.
web_src/css/shared/flex-list.css	Refactors divided-list padding/divider helpers around items-px-default.
web_src/css/repo.css	Tweaks commit-status list sizing.
web_src/css/modules/segment.css	Simplifies fitted segment padding rules.
templates/repo/pulls/status_items.tmpl	Extracts reusable commit-status item rendering.
templates/repo/pulls/status.tmpl	Removes the old monolithic status template.
templates/repo/issue/view_content/update_branch_by_merge.tmpl	Reworks update-branch block to use merge-box data.
templates/repo/issue/view_content/pull_merge_status_checks.tmpl	Adds a new merge-box partial for status checks and approvals.
templates/repo/issue/view_content/pull_merge_box.tmpl	Rewrites the PR merge box to use backend data and new partials/components.
templates/repo/commit_statuses.tmpl	Reuses the new shared status item partial in commit-status popovers.
templates/devtest/flex-list.tmpl	Updates examples to the new flex-list padding model.
routers/web/repo/pull_merge_form.go	Backend-prepares merge form props/styles, including manual merge handling.
routers/web/repo/pull_merge_box.go	Adds backend logic for timeline icon coloring.
routers/web/repo/pull.go	Extends merge-box/view structs with backend-prepared fields.
routers/web/repo/issue_view.go	Populates merge-box data and invokes the new backend helpers.

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