[Feature]: Filter Access Points by Wi-Fi Standard

[gioalex07]

Filter Access Points by Wi-Fi Standard

Is your feature request related to a problem? Please describe.

Problem

Currently, WiFiAnalyzer allows filtering access points by band (2.4 GHz, 5 GHz, 6 GHz), strength,
and security. However, there is no way to filter by Wi-Fi standard (e.g. 802.11n, ac, ax, be).

As Wi-Fi 6 (802.11ax) and Wi-Fi 7 (802.11be) deployments become more common, users may want to
focus only on access points that support a specific standard — for example, to identify legacy
devices or verify that newer standards are available in their environment.

Proposed Solution

Add a WiFiStandardFilter following the existing WiFiBandFilter pattern already in the codebase.

The WiFiStandard enum is already fully defined in wifi/model/WiFiStandard.kt:

enum class WiFiStandard { UNKNOWN, LEGACY, N, AC, AX, AD, BE }

The filter system already has a generic EnumFilter base and EnumFilterAdapter that handle
multi-select enum filtering. Adding WiFiStandardFilter would extend this pattern with minimal
new code.

Expected behavior

• New filter option in the filter dialog: Wi-Fi Standard
• Multi-select: user can select one or more standards (e.g. AX + BE only)
• Default: all standards selected (no filtering applied)
• Consistent with existing filter UX for band and strength

Files that would be affected

• wifi/filter/WiFiStandardFilter.kt — new filter class
• wifi/filter/adapter/WiFiStandardAdapter.kt — new adapter
• wifi/filter/adapter/FiltersAdapter.kt — register new filter
• wifi/filter/Filter.kt — integrate new filter predicate
• Corresponding test files

Why this fits the project

• No new dependencies
• Follows the existing EnumFilter / EnumFilterAdapter pattern exactly
• WiFiStandard model and detection logic already exist and are tested
• Consistent with the project's goal of helping users analyze and understand their Wi-Fi environment

Describe the solution you'd like

No response

Alternatives considered

No response

How I can help

No response

Reproduction / Occurrence frequency

None

Priority / Impact

None

Device model

No response

Android version

No response

Android API level

No response

WiFiAnalyzer version

No response

Build variant

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Additional context

• Tested on: WSL2 / AlmaLinux 9, Android SDK 36
• Wi-Fi standard detection requires Android 11+ (Build.VERSION_CODES.R);
  on older devices the filter would show UNKNOWN for all access points,
  which is the current behavior already handled by WiFiStandard.findOne()

Screenshots / Mockups / Attachments (optional)

No response