fix(highlighting): restore TypeScript and Markdown syntax styles

[owainlewis]

Summary

TypeScript and TSX now highlight ordinary JavaScript tokens, with JSX styles taking precedence over general identifiers.
Markdown inline formatting is parsed only in prose and table cells, so emphasis-looking text inside fenced or indented code retains its code style.

Why

TypeScript previously configured only the supplemental grammar query, leaving common tokens uncoloured.
Markdown's extra line-by-line inline pass reinterpreted source inside fences and could not retain multiline emphasis context.
Use complete language query composition and block-owned Markdown injections, removing the redundant parser pass.

Test plan

• Reproduced missing TypeScript keyword colours, Markdown fence overrides, and table-cell formatting loss with failing regressions before their fixes.
• All 52 highlighter tests and 57 renderer tests pass, including exact token categories, multiline emphasis, quoted/tilde fences, table cells, unknown-language code, and the retained renderer's string style.
• cargo fmt --check, git diff --check, cargo clippy --all-targets -- -D warnings, and cargo build --release pass.
• Release binary PTY smoke passed for .ts, .tsx, and .md: truecolor/string styles, edit/undo, clean exit, preserved files, restored terminal settings, and a usable shell.
• cargo test passed its unit-test phase. A serial terminal-suite rerun passed 8/10 tests; the two existing redirected-input cases still fail in this local environment (one explicit EPERM). Verify and document the complete local coding workflow #172 tracks investigation. Required CI must pass before merge.
• Independent review: Approve after fixing the reviewer's Markdown table finding.

Risks

Markdown's block query now explicitly includes child text in inline/code injections and includes table-cell nodes.
The supported-language list, cache strategy, buffer edits, and save behavior are unchanged.
The parent rollout's roadmap state is updated for the already merged direction decision.

Related issue

Closes #162.
Parent: #160.

[greptile-apps]

Greptile Summary

This PR restores complete TypeScript and TSX highlighting by composing the JavaScript, JSX, and TypeScript queries, and replaces Markdown’s line-by-line inline highlighting pass with block-owned injections that preserve code-block styling and multiline prose context.

• Adds focused regressions for TypeScript tokens, TSX precedence, Markdown fences, indented code, multiline emphasis, and table cells.
• Adds a renderer-level assertion that fenced source retains its language-specific style.
• Updates the issue plan and roadmap state.

Confidence Score: 5/5

The current PR appears safe to merge, with no actionable correctness, security, or repository-rule violations identified.

The composed language queries restore ordinary TypeScript and TSX categories, while Markdown injections preserve block ownership and avoid interpreting fenced or indented code as prose; focused highlighter and renderer regressions cover the affected behavior.

Important Files Changed

Filename	Overview
src/highlighter.rs	Composes complete TypeScript/TSX highlight queries, moves Markdown inline handling into block-scoped injections, and adds focused regression coverage.
src/renderer.rs	Adds a retained-frame regression test proving that Markdown-fenced Rust strings keep their rendered string style.
docs/issues/162-plan.md	Documents the highlighting failure modes, implementation approach, scope, and verification criteria.
docs/roadmap.md	Updates roadmap status and records the disposition of superseded layout tickets.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Document and file extension] --> B{Language}
    B -->|TypeScript| C[JavaScript query]
    C --> D[TypeScript supplemental query]
    B -->|TSX| E[JavaScript query]
    E --> F[JSX query]
    F --> G[TypeScript supplemental query]
    B -->|Markdown| H[Markdown block parser]
    H --> I[Inject markdown_inline into prose and table cells]
    H --> J[Inject fenced language into code content]
    D --> K[Highlight spans]
    G --> K
    I --> K
    J --> K
    K --> L[Renderer styles]

Loading

_{Reviews (2): Last reviewed commit: "fix(highlighting): restore TypeScript an..." | Re-trigger Greptile}