[lxsmnsyc]

Adds a copy button to the dock header that puts one Markdown report of everything the devtools noticed on the clipboard. It is for when it is not clear which panel holds the problem. This PR is based on #30.

Changes

• The report has, newest first:
  • the three newest errors in full, with their mapped stacks and source, and a count of the rest;
  • every issue with its severity, count, owner path and message, up to 20;
  • the five newest timeline actions, with their writes, re-runs, calls, time and outcome;
  • the async records that were flagged, up to 10;
  • the server calls that failed.
• A section appears only when its panel has something. With nothing at all, the report says so.
• Each panel's report functions are reused. Error reports move two heading levels down with demote, which skips code blocks.
• session-report.ts and the stack mapping are imported when the button is pressed, so they stay out of the main bundle like the error panel.
• Values with sensitive names are redacted, as in every other report.

Example

From the test fixture, after a few clicks:

# Solid devtools session

## Issues (3)

- warn `SILENT_HOLD` in `<App> > <Show> > value > <AsyncProfile>`: click on button#next-user "next user" wrote "userId" (1 → 2); the write was held 605ms …
- warn `STRICT_READ_UNTRACKED` in `<App> > <Show> > value > <DraftReader>`: Reactive value "draft" read directly in <DraftReader> will not update. …
- info `ASYNC_WATERFALL` in `<App> > <Show> > value > <AsyncProfile> > posts`: 2 sequential async flights …

## Recent actions, newest first

- `click on button#next-user "next user"`, 3 writes, 4 re-runs in 606.5ms, held: `userId`, `user`, `posts`
- `click on button#call-server "call server"`, 0 writes, 0 re-runs, 1 call in 1.3ms, idle

## Async concerns (4)

- `wait on user, posts`, 605.4ms: no pending state shown, started by `click on button#next-user "next user"`
- `chain user → posts`, 603.1ms: loads ran one after another

Testing

• Unit tests in src/dev-toolbar/report/session-report.test.ts cover demote, the empty report, and a report with a section from every panel.
• A new e2e test makes an action and an issue, copies the session, and checks the sections.
• pnpm test, pnpm typecheck, pnpm format:check, pnpm build, pnpm check and the full e2e suite pass locally.

🤖 Generated with Claude Code