Add dashboard training guide screenshots

[konard]

Summary

• Added four dashboard UI screenshots to docs/INTEGRAM_DASHBOARD_TRAINING_GUIDE.md near the sections they illustrate: overview, panel filter, chart appearance settings, and tile layout.
• Removed the temporary .gitkeep placeholder from PR creation.

Verification

• git diff --check
• Confirmed every embedded screenshot path exists under docs/screenshots/.

Screenshots

Fixes #2506

[konard]

Working session summary

Implemented and pushed the docs update.

Added four screenshots with Russian alt text and captions in docs/INTEGRAM_DASHBOARD_TRAINING_GUIDE.md: overview, panel filter, chart appearance settings, and tile layout. Removed the temporary .gitkeep placeholder commit artifact.

Verification:

• git diff --check passed
• Confirmed all embedded screenshot paths exist
• Working tree is clean
• gh pr checks reports no checks configured for this branch

PR 2507 is updated and ready for review: #2507

---

This summary was automatically extracted from the AI working session output.

[konard]

🤖 Solution Draft Log

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost estimation:

• Model: GPT-5.5
• Provider: OpenAI
• Public pricing estimate: $4.425036

📊 Context and tokens usage:

• 173.1K / 1.1M (16%) input tokens, 10.8K / 128K (8%) output tokens

Total: (173.1K + 2.2M cached) input tokens, 10.8K output tokens, $4.425036 cost

🤖 Models used:

• Tool: OpenAI Codex
• Requested: gpt-5.5
• Model: GPT-5.5 (gpt-5.5)

📎 Log file uploaded as Gist (14663KB)

• View complete solution draft log

---

Now working session is ended, feel free to review and add any feedback on the solution draft.

[konard]

✅ Ready to merge

This pull request is now ready to be merged:

• No CI/CD checks are configured for this repository
• No merge conflicts
• No pending changes

---

Monitored by hive-mind with --auto-restart-until-mergeable flag