[danielbrownjr]

Summary

Promotes the web-observability work to the physically validated v0.4.6 RC.

This PR adds the browser status/AP/session UI and the associated radio/storage hardening while preserving BandiC5's active-scout behavior.

v0.4.6 RC fixes

Two peak-heap fixes were validated on physical ESP32-C5 hardware:

• Stream Wi-Fi scan records one at a time with esp_wifi_scan_get_ap_record() instead of allocating a second array sized to the full AP result set.
• Reduce the HTTP server task stack from 8192 bytes to 4096 bytes.

These changes restore safe internal-RAM headroom while the TF/FAT stack, uplink, HTTP server, mDNS, and dense dual-band scanning are all active.

Physical validation

Validated on real Waveshare ESP32-C5-LCD-1.47 hardware with the clean PR #4 build at:

acc37b24efde4fb1da173d1b7255e39cda93e922

Test sequence passed:

• boot and dense dual-band scans
• infrastructure uplink and status page
• repeated ~80-100 AP scans
• TF removal during logging
• repeated mount retries while card absent
• TF reinsertion and recovery to a new session
• continued scans after recovery
• runtime BOOT hold into phone OTA mode without a power cycle

No Wi-Fi OOM or FAT/VFS ESP_ERR_NO_MEM recurrence was observed.

Notes

• release/v0.3.1 remains the frozen recovery landmark at 2e9f017ddb7580c48c539006a423e1543c0f2f84.
• Diagnostic PR diag: v0.4.5 heap/hotplug instrumentation #5 is not part of this release path.
• This PR remains unmerged until explicitly authorized.