ahochsteger / gmail-processor / 23712997288

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⚡ Fix ERESOLVE in docs build and optimize thread message count retrieval

This commit addresses the GitHub Action CI failure where `npm run ci:docs`
failed with an ERESOLVE error due to conflicting peer dependencies for
`@typescript-eslint/utils`. Added `--legacy-peer-deps` to the `npm ci`
command in the `docs` directory to resolve this issue and allow the build
to succeed.

Includes the previous performance optimization:
Replaced `thread.getMessages().length` with `thread.getMessageCount()`
in `BaseProcessor.describeThread`. Using `getMessages().length` required
fetching all message data over the network via the Gmail API, which scales
poorly with the number of messages in the thread and unnecessarily
downloads large payloads. Using the native `getMessageCount()` method
significantly reduces network IO and latency.

Benchmark using mock 5ms latency per message fetch:
Before: 50 messages -> 250ms latency
After: 50 messages -> 0.01ms latency (negligible)

Co-authored-by: ahochsteger <207989+ahochsteger@users.noreply.github.com>

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