Surface parser diagnostics in TUI

[rdzehtsiar]

Motivation

• Make parser state visible to users by surfacing parser diagnostics and limitations (truncated content, invalid UTF-8, binary/unsupported content, parser init/parse errors) instead of silently skipping parser work.
• Persist parser notes into the index so the TUI can tag and display affected files for easier triage.

Description

• Go parser now recognizes files by extension even when the active content window is truncated or has encoding/content issues, and emits appropriate ParserDiagnostic and ParserLimitation entries (added unsupported_content_kind and content_kind_label).
• File analyzer now appends parser diagnostics and limitations into the file-level diagnostics before the result is stored (added append_parser_notes).
• Store reducer now serializes diagnostics from both file-level diagnostics and parser output into the diagnostics JSON stored in the index, merging without duplication (changed diagnostics_json to accept &FileAnalysisResult and added push_diagnostic_json).
• TUI now reads stored diagnostics from file_facts.diagnostics, exposes a parser_diagnostics field on RiskRow, tags rows with PARSER, and renders a "Parser diagnostics" inspector section (added parse_diagnostics_json, inspector rendering, and tagging).
• Added unit tests and updated fixtures to cover parser diagnostics propagation, index storage, and TUI loading/rendering.

Testing

• Ran cargo fmt --check and it succeeded.
• Ran cargo clippy --all-targets --all-features -- -D warnings and it succeeded.
• Ran the full test suite with cargo test and all tests passed (97 passed; 0 failed).
• Ran focused tests covering the new behavior and fixtures and they passed: cargo test parser_diagnostics and TUI tests tui::tests::loads_project_summary_and_ranked_rows and tui::tests::renders_hotpath_view_with_inspector all succeeded.

---

Codex Task

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

❌ Patch coverage is 93.06358% with 12 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/pipeline/store_reducer.rs	92.30%	4 Missing and 1 partial ⚠️
src/tui.rs	87.50%	2 Missing and 3 partials ⚠️
src/languages/go.rs	88.23%	2 Missing ⚠️

📢 Thoughts on this report? Let us know!

[github-actions]

Qodana for Rust

It seems all right 👌

No new problems were found according to the checks applied

💡 Qodana analysis was run in the pull request mode: only the changed files were checked
☁️ View the detailed Qodana report

Contact Qodana team

Contact us at qodana-support@jetbrains.com

• Or via our issue tracker: https://jb.gg/qodana-issue
• Or share your feedback: https://jb.gg/qodana-discussions

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
95.3% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud