UX-friendly logs and progress across all pipelines

[JCHAVEROT]

Summary

Related issue: #278
Subsequent to: #323

This PR adds one shared UX module and moves every pipeline onto it. Runs now show a short intro, a single progress bar, and a short summary per step. Noise and debug logs are hidden by default, and MMORE_VERBOSE=1 brings them back for debugging. Also some cleaning in the TUI to use mmore's brand color (#f7cb46 currently but likely to be changed soon)

Changes

• Added src/mmore/ux.py: shared logging, colors, spinner, progress bar, and step intro/summary cards
• Moved all pipelines onto it (process, post-process, index, RAG, retriever, websearch, colvision)
• Muted noisy third-party logs and download bars
• Changed most INFO logs to DEBUG
• Added MMORE_VERBOSE to toggle full debug output
• In the TUI, wired colvision, removed the retriever API from it and miscellaneous cleanings
• Updated documentation for MMORE_VERBOSE

# To have full logs when debugging
MMORE_VERBOSE=1 mmore process --config_file examples/process/config.yaml

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Demo

Current version in EPFLiGHT/mmore:master

old_compressed.mp4

New version

new_compressed.mp4