cache font outline lookup in `path_builder.rs` (performance)

[Veercodeprog]

node-graph/nodes/text/src/path_builder.rs, immediately before building ReadFontsRef and outline_glyphs() inside PathBuilder::render_glyph_run can be cached for better performance.

Current behavior

For each glyph run, the code:

• Collects normalized_coords from the run into a Vec.
• Takes font.data / font.index, constructs ReadFontsRef::from_index(...), and calls outline_glyphs().
• Iterates glyphs and draws outlines via draw_glyph.

Problem

render_glyph_run can be invoked frequently during text layout and editing. Reconstructing the font reference and outline glyph set for the same underlying font on every call is likely redundant work and may show up in profiling for documents with a lot of text or frequent updates.

Proposed direction

Introduce a cache keyed by something stable for the font instance, such as font data identity plus index, and any other inputs that affect outline access if needed. The cache would store or reuse the equivalent of ReadFontsRef / outline_glyphs() (or another API-appropriate handle) so repeated runs against the same font avoid repeated parsing.

Additional considerations:

• Optionally reduce allocations, for example by reusing a buffer for normalized_coords, if profiling shows it matters.
• Ensure thread-safety and lifetime rules match how PathBuilder is used in the text node pipeline.
• Add a small benchmark or trace comparison before and after, if feasible.

Location

node-graph/nodes/text/src/path_builder.rs — PathBuilder::render_glyph_run, near the TODO at around line 102.

Labels

• performance

[Veercodeprog]

i have just checked the comments added for this part.i am not using ai as a copy paste tool.i use it sometimes as a google when i dont understand certain code. i haven’t added in code anything i dont understand and only added the code by making sure the logic and how its going to fix something.

[Keavon]

The content of this issue does not pass the smell test of being human written and may likely be hallucinated. Closing since this has the risk of being AI spam and is likely not actionable.

[Veercodeprog]

The content of this issue does not pass the smell test of being human written and may likely be hallucinated. Closing since this has the risk of being AI spam and is likely not actionable.

maybe i am not good with framing pr description
let me rephrase the pr description

i can e anything if you dont understand particularly some part or something