fix: update bitkit core

[ovitrif]

Description

This PR updates Bitkit Core to v0.1.75 for LNURL-pay payment handling.

Preview

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QA Notes

Manual Tests

N/A

Automated Checks

• just test

[greptile-apps]

Greptile Summary

This PR updates bitkit-core-android from 0.1.73 to 0.1.75 to incorporate LNURL-pay payment handling improvements, accompanied by a hotfix changelog entry.

• gradle/libs.versions.toml: Single-line version bump for com.synonym:bitkit-core-android from 0.1.73 → 0.1.75. The jump skips 0.1.74, which is expected for a targeted hotfix pull.
• changelog.d/hotfix/lnurl-pay-core.fixed.md: New changelog fragment describing the LNURL-pay improvement for release note generation.

Confidence Score: 5/5

Safe to merge — the change is a single dependency version bump with a matching changelog entry and no application logic touched.

Only the bitkit-core-android version string changes; no Kotlin/Java source files, no configuration logic, and no build scripts are modified beyond the version catalog. The skip from 0.1.73 to 0.1.75 is consistent with a hotfix context and does not affect the Android project's build graph beyond pulling the new artifact.

No files require special attention.

Important Files Changed

Filename	Overview
gradle/libs.versions.toml	Bumps bitkit-core-android from 0.1.73 to 0.1.75; skips 0.1.74, which is intentional based on the hotfix context.
changelog.d/hotfix/lnurl-pay-core.fixed.md	Adds a hotfix changelog entry describing improved LNURL-pay payment handling.

Sequence Diagram

%%{init: {'theme': 'neutral'}}%%
sequenceDiagram
    participant App as Bitkit Android
    participant Core as bitkit-core-android
    participant LN as LNURL-pay Endpoint

    App->>Core: initiate LNURL-pay (v0.1.75)
    Core->>LN: fetch LNURL metadata
    LN-->>Core: return pay params
    Core->>LN: send payment request
    LN-->>Core: return payment result
    Core-->>App: payment success / failure

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
sequenceDiagram
    participant App as Bitkit Android
    participant Core as bitkit-core-android
    participant LN as LNURL-pay Endpoint

    App->>Core: initiate LNURL-pay (v0.1.75)
    Core->>LN: fetch LNURL metadata
    LN-->>Core: return pay params
    Core->>LN: send payment request
    LN-->>Core: return payment result
    Core-->>App: payment success / failure

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_{Reviews (1): Last reviewed commit: "chore: rename changelog fragment" | Re-trigger Greptile}

[ovitrif]

Closing in favor of a release-branch targeting PR.