Improve Tachyon UX

This is a meta issue to group all the items to improve the UX of the tachyon profiler.

Tasks

CLI

• Standardize timing arguments — Currently mixing µs and seconds for related timing args, which is confusing
• Duration should default to "until done" - The fact that we sample only for 10 seconds by default is confusing to users and a bad experience

Workflow

• Auto-open browser with results — Reduce manual steps in the workflow; add --no-browser flag to disable

Flamegraph

• Hide runner/bootstrap frames by default — Top rows showing interpreter startup aren't useful for most profiling tasks
• The Gil/gc/exception indicators could be progress bars — this probably will show the information more clearly and take less space
• Show module names instead of full file paths — /home/user/project/pkg/mod.py → pkg.mod for readability
• Show "self" time for functions — Display time spent in function body excluding callees, not just total inclusive time
• Move hotspots to top of sidebar — This is the most important info; currently buried below logo and stats
• Fix inverted flamegraph width — Currently shows narrow chart when leaves sum to small percentage, wasting screen space

Pstats

• Fix docs: -o output format — Docs imply text output but it's actually binary pstats format
• Standardize --pstats behavior — Output format differs significantly with/without -o flag, which is unexpected

Thanks @dmoisset 🖤

Linked PRs

• gh-142934
• gh-142936
• gh-142987
• gh-143178
• gh-143180
• gh-143337
• gh-143388
• gh-144885
• gh-145329
• gh-145428
• gh-146040
• gh-147706
• gh-148118
• gh-148568

This is a meta issue for Tachyon profiler UX, and every listed task is marked complete. The issue references linked PRs gh-142934, gh-142936, gh-142987, gh-143178, gh-143180, gh-143337, gh-143388, gh-144885, gh-145329, gh-145428, gh-146040, gh-147706, gh-148118, and gh-148568; no remaining change or validation target is identified.