UPSTREAM PR #18147: webui: Add editing attachments in user messages

[loci-dev]

Mirrored from ggml-org/llama.cpp#18147

Close #17206

• Improved form UI component for editing user messages with options to choose model and attach files
• Allow removing/adding files to edited message
• Allow to update edited message without re-generating

Demo

demo.mp4

[loci-review]

Explore the complete analysis inside the Version Insights

Performance Analysis Summary

Project: llama.cpp
PR #617: webui: Add editing attachments in user messages
Scope: Frontend-only changes (14 files, +765/-241 lines)

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Analysis Result

Condition 1 applies: No performance impact detected.

This PR modifies exclusively the web UI frontend components (Svelte/JavaScript) for the llama-server tool. No C/C++ source files in performance-critical areas were changed. The compressed build artifact index.html.gz update reflects frontend compilation only. All binaries show 0.0% power consumption change. No functions exhibit response time or throughput variations. The changes implement attachment editing functionality in the chat interface without touching inference pipelines, tokenization, or model execution paths.