feat(settings): read-only MCP Servers tab in the settings modal

[saucam]

What

Brings the cross-backend MCP registry surface to the TUI, matching the web's "🔌 MCP Servers" settings tab (codeoid #203). Until now the daemon emitted mcpServers on the settings snapshot but only the web rendered it — the TUI was blind to it (unbroken, just no view). Now every frontend shows it.

Changes

• codeoid-protocol — McpServerStatus struct + a mcp_servers field on SettingsSnapshot. #[serde(default)] keeps it forward-compatible: an older daemon that doesn't send the field deserializes fine (empty).
• state — has_mcp_tab() / on_mcp_tab() and tab_count() appends a synthetic MCP tab after the manifest tabs only when the daemon reports servers. tab_fields() is already empty there, so field navigation / edit / save no-op on the read-only tab — zero changes needed in the key handlers.
• ui — a header pill + mcp_server_rows: per server, a colour-coded health chip (connected/error/idle/disabled), transport · trust · N tools, error text, tool list, backends, and a built-in badge for codeoid_memory.

Tests

A state test asserts the synthetic tab appears only when servers exist, sits after the manifest tabs, exposes no fields, and disappears when the list empties. cargo fmt --check clean; 284 tests pass; clippy is advisory (no new error-level lints).

Note

This depends on the daemon sending mcpServers in the settings snapshot (codeoid #203). The Rust struct is a hand-maintained mirror of the TS McpServerStatus — the usual codeoid-protocol convention.

🤖 Generated with Claude Code

[github-actions]

🤖 Gemini code review

This PR introduces a read-only 'MCP Servers' tab to the TUI settings modal, bringing feature parity with the web interface. It appends a synthetic tab when the daemon reports registry MCP servers and displays their health status, tools, and error messages.

Findings: 🔴 0 · 🟠 0 · 🟡 0 · 🟢 1

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_{Tokens spent · ⬆️ Input: 3,919 · ⬇️ Output: 318 · Σ Total: 7,462
Total may be higher due to thinking token counts.}

[codecov]

Codecov Report

❌ Patch coverage is 93.17073% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.30%. Comparing base (efe6cc1) to head (f7dd05d).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/codeoid-tui/src/ui/modal.rs	91.17%	12 Missing ⚠️
crates/codeoid-tui/src/app.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
+ Coverage   68.78%   70.30%   +1.51%     
==========================================
  Files          31       31              
  Lines        9659     9862     +203     
==========================================
+ Hits         6644     6933     +289     
+ Misses       3015     2929      -86     

Flag	Coverage Δ
tui	70.30% <93.17%> (+1.51%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
crates/codeoid-tui/src/state/mod.rs	82.51% <100.00%> (+5.02%)	⬆️
crates/codeoid-tui/src/app.rs	51.42% <0.00%> (-0.05%)	⬇️
crates/codeoid-tui/src/ui/modal.rs	39.13% <91.17%> (+17.63%)	⬆️