feat: merge the PR-comment browser + editor CTAs into one line

[brovatten]

Collapses the footer's two stacked call-to-action lines — a 🌐 Explore … in your browser → line and a separate See this … in your editor: Open in VS Code → line — into a single sentence: Explore this PR's architecture in your browser or VS Code. The browser link only joins when webview_ready (head analysis committed, non-fork PR), and "your" rides with the browser entry alone so it still reads correctly when only the editor link is present (… in VS Code); multiple detected editors render with an Oxford "or" (browser, VS Code, or Cursor), while the ⚠️ health banner and the proxy-only "Get the extension" line stay on their own lines.

Before / after:

- 🌐 Explore this PR's architecture in your browser →
-
- See this architecture in your editor: Open in VS Code →
+ Explore this PR's architecture in your browser or VS Code.

Testing: Rewrote tests/test_build_cta.py for the merged format and added cases for the join logic and each branch (browser+editor, editor-only, both editors, no-webview); full unit suite (123) green and black clean, and I rendered the real footer for the default, fork-PR, and proxy+both-editors cases.

🤖 Generated with Claude Code

[codeboarding-review]

Architecture review · 6 components changed

graph LR
    n_Action_Orchestrator["Action Orchestrator"]
    n_Structural_Analyzer_Documenter["Structural Analyzer #amp; Documenter"]
    n_Diffing_Visualization_Engine["Diffing #amp; Visualization Engine"]
    n_Integration_Feedback_Provider["Integration #amp; Feedback Provider"]
    n_Action_Orchestrator -- "triggers structural mapping and file rendering" --> n_Structural_Analyzer_Documenter
    n_Action_Orchestrator -- "initiates baseline comparison and mermaid gener…" --> n_Diffing_Visualization_Engine
    n_Structural_Analyzer_Documenter -- "provides filtered change sets and method metada…" --> n_Diffing_Visualization_Engine
    n_Diffing_Visualization_Engine -- "requests component naming and file-level filter…" --> n_Structural_Analyzer_Documenter
    n_Diffing_Visualization_Engine -- "provides visual syntax for report generation" --> n_Integration_Feedback_Provider
    n_Action_Orchestrator -- "delegates final CTA and webview link creation" --> n_Integration_Feedback_Provider
    n_Diffing_Visualization_Engine -- "Returns the updated analysis state to be saved…" --> n_Action_Orchestrator
    classDef added fill:#1f883d,stroke:#0b5d23,color:#ffffff;
    classDef modified fill:#bf8700,stroke:#7d4e00,color:#ffffff;
    classDef deleted fill:#cf222e,stroke:#82071e,color:#ffffff,stroke-dasharray:5 3;
    class n_Integration_Feedback_Provider modified;
    linkStyle 1 stroke:#0b5d23,stroke-width:2px;
    linkStyle 0,2,3,4,5 stroke:#7d4e00,stroke-width:2px;
    linkStyle 6 stroke:#82071e,stroke-width:2px,stroke-dasharray:5 3;

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Colors indicate component changes compared to main: 🟩 Added · 🟨 Modified · 🟥 Removed

Integration & Feedback Provider : 1 file changed

• scripts/build_cta.py

---

Explore this PR’s architecture in your browser or VS Code.

_{codeboarding-action · run 27481078691}