fix(editor): cache rainbow bracket tokenization and improve the rainbow bracket related issues happens when editing

[bajrangCoder]

No description provided.

[greptile-apps]

Greptile Summary

This PR rewrites the rainbow brackets plugin to use a block-based LRU cache (2048-char blocks, 192-entry max) that avoids re-tokenizing unchanged text on every keystroke, and makes rainbow bracket colors theme-aware by deriving them from the active theme config. A new update:editorTheme listener in editorManager.js ensures the rainbow compartment is reconfigured whenever the editor theme changes.

All remaining findings are P2 style suggestions: a redundant != null guard on an array length check, a redundant /i flag on a regex whose input is already lowercased, and the removal of RAF debouncing that could cause occasional main-thread blocking on large pastes.

Confidence Score: 5/5

Safe to merge — all findings are non-blocking P2 style suggestions with no correctness or data-integrity issues

The block cache logic is correct, LRU eviction via Map insertion order is well-implemented, theme color derivation is sound, and the editorTheme listener properly re-applies colors on theme change. No P0/P1 issues were found.

src/cm/rainbowBrackets.ts deserves a future pass to consider restoring RAF debouncing for large-paste scenarios, but this is not a blocker

Important Files Changed

Filename	Overview
src/cm/rainbowBrackets.ts	Complete rewrite adding block-based LRU cache and theme-aware colors; minor redundancies in normalizeHexColor regex flag and the colors guard; synchronous rebuild is a potential latency trade-off worth documenting
src/lib/editorManager.js	Adds makeRainbowBracketExtension() factory and update:editorTheme listener to correctly sync rainbow bracket colors when the editor theme changes

Sequence Diagram

sequenceDiagram
    participant U as User
    participant S as appSettings
    participant EM as editorManager
    participant F as makeRainbowBracketExtension
    participant RB as rainbowBrackets()
    participant RC as rainbowCompartment

    U->>S: change editorTheme
    S->>EM: emit update:editorTheme
    EM->>EM: editor.setTheme(newThemeId)
    Note over EM: themeCompartment reconfigured
    EM->>F: applyOptions(["rainbowBrackets"])
    F->>F: getThemeConfig(themeId)
    F->>RB: getRainbowBracketColors(config)
    RB-->>F: theme-appropriate colors[]
    F->>RB: rainbowBrackets({ colors })
    RB-->>RC: [ViewPlugin, baseTheme]
    RC->>EM: reconfigure compartment with new colors

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