Feature: add configurable default scheduled time option

[dazewell]

Add configurable default schedule time setting

Motivation

Currently when user wants to schedule message, default time offset is always 10 minutes. This is not convenient when you need send multiple scheduled messages all for some later time - for example, if you preparing a story or what's more important, if you need to reply to many messages (and thus need to leave the Scheduled Messages view) and don't want them to be sent until you're done and reviewed it.

Every time you need click through date picker and adjust time manually. This is very annoying and makes scheduled messages feature less useful for such scenarios.

What this PR does

This PR adds new setting in N-Settings → Chat → Chats section that allows configure default time offset for scheduled messages.

Now user can:

• Choose preferred default time from dropdown (5 min, 10 min, 15 min, 30 min, 1h, 2h, 4h, 8h, 1 day, 2 days, 3 days, 7 days)
• Setting saves globally and applied for all chats
• When opening schedule dialog, time picker will automatically show current time + configured offset
• No need anymore adjust time manually each time

Use cases

This feature will be useful for:

• Content creators who need schedule multiple posts in different channels (for example, after 2 hours)
• Users sending story-mode messages - when you want tell long story in several messages and don't want them to be sent too early, or just gather the full story, read it through, and then send all at once

Testing

Tested scenarios:

• Change default time and schedule message - works correct
• Restart application - setting persists
• Schedule multiple messages with different default times
• Settings UI updates immediately when changing value

Summary by CodeRabbit

• New Features
  • Introduced configurable default delay for scheduled messages, allowing users to set and manage a preferred default delivery time without manual adjustment for each message.
  • Added interactive UI control with adjustable slider to customize the default schedule delay and automatically persist user preferences.

[coderabbitai]

Actionable comments posted: 3

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 14b29d8a-a7b7-4f92-83d0-d8faafc56eb6

📥 Commits

Reviewing files that changed from the base of the PR and between 7715439 and 7a95298.

📒 Files selected for processing (5)

• TMessagesProj/src/main/java/org/telegram/ui/Components/AlertsCreator.java
• TMessagesProj/src/main/java/tw/nekomimi/nekogram/settings/NekoChatSettingsActivity.java
• TMessagesProj/src/main/kotlin/xyz/nextalone/nagram/NaConfig.kt
• TMessagesProj/src/main/kotlin/xyz/nextalone/nagram/ScheduleTimeShift.kt
• TMessagesProj/src/main/res/values/strings_nax.xml

[risin42]

Let's make it better.

[dazewell]

Let's make it better.

Oh jeeez, waaaay better now! Appreciate your help and such a fast turn-over!