feat: show icon instead of channel alias

[waifucon]

it looks better imo.

Option disabled:

Option enabled:

just like this pr: #85

Summary by Sourcery

Add configurable channel icons for channel-authored message labels.

New Features:

• Add an option to display a channel icon instead of the channel alias on channel-authored messages.

Enhancements:

• Use the rendered admin label layout to calculate channel label width accurately.
• Hide the custom channel label setting when channel icons are enabled.

[sourcery-ai]

Reviewer's Guide

This PR adds a configurable channel-icon presentation for channel-authored megagroup messages, replacing the alias/custom label with a cached broadcast icon while updating label sizing and conditionally adjusting the related experimental settings UI.

Sequence diagram for channel icon rendering

sequenceDiagram
    participant ChatMessageCell
    participant NaConfig
    participant TimeStringHelper
    participant ContextCompat
    participant Theme
    participant StaticLayout

    ChatMessageCell->>NaConfig: getShowChannelIcon().Bool()
    alt icon enabled
        ChatMessageCell->>TimeStringHelper: getChannelDrawable()
        TimeStringHelper->>ContextCompat: getDrawable(applicationContext, menu_broadcast)
        ContextCompat-->>TimeStringHelper: Drawable
        TimeStringHelper-->>ChatMessageCell: channelDrawable
        ChatMessageCell->>Theme: chat_adminPaint.getTextSize()
        ChatMessageCell->>ChatMessageCell: append icon span
    else icon disabled
        ChatMessageCell->>NaConfig: getCustomChannelLabel().String()
        ChatMessageCell->>ChatMessageCell: getChannelAlias(channel_id)
        ChatMessageCell->>ChatMessageCell: append alias or channel label
    end
    ChatMessageCell->>StaticLayout: getLineWidth(0)
    StaticLayout-->>ChatMessageCell: adminWidth

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Flow diagram for experimental channel label settings

flowchart TD
    A[User toggles ShowChannelIcon] --> B[NaConfig.showChannelIcon updates]
    B --> C[updateRows]
    C --> D{ShowChannelIcon enabled?}
    D -->|Yes| E[Hide custom channel label row]
    D -->|No| F[Show custom channel label row]

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File-Level Changes

Change	Details	Files
Add an option to render a broadcast-channel icon in place of the channel alias for channel-authored megagroup messages.	Introduce a persisted ShowChannelIcon configuration option and expose it in experimental settings. Render the broadcast drawable as a centered, text-sized span and calculate the resulting admin-label width with StaticLayout. Preserve alias/custom-label rendering when the icon option is disabled, and hide the custom channel label setting when the icon is enabled. Cache the channel drawable for reuse.	TMessagesProj/src/main/java/org/telegram/ui/Cells/ChatMessageCell.java TMessagesProj/src/main/java/tw/nekomimi/nekogram/helpers/TimeStringHelper.java TMessagesProj/src/main/java/tw/nekomimi/nekogram/settings/NekoExperimentalSettingsActivity.java TMessagesProj/src/main/kotlin/xyz/nextalone/nagram/NaConfig.kt TMessagesProj/src/main/res/values/strings_na.xml

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[sourcery-ai]

Hey - I've found 4 issues

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="TMessagesProj/src/main/java/org/telegram/ui/Cells/ChatMessageCell.java" line_range="19098-19099" />
<code_context>
-                    adminString.append(channelStr);
                 }
-                adminWidth = (int) Math.ceil(Theme.chat_adminPaint.measureText(adminString.toString()));
+                StaticLayout staticLayout = new StaticLayout(adminString, Theme.chat_adminPaint, dp(300), Layout.Alignment.ALIGN_NORMAL, 0f, 0f, false);
+                adminWidth = (int) Math.ceil(staticLayout.getLineWidth(0));
                 nameWidth -= adminWidth;
             } else {
</code_context>
<issue_to_address>
**Long labels overlap message content**

When a channel alias or configured label exceeds 300dp, `StaticLayout.getLineWidth(0)` measures only the first wrapped line, making `adminWidth` too narrow and `nameWidth` too large. The label wraps, overlaps the author name, and can spill into message content.

Measure the complete label rather than only the first line when calculating `adminWidth`.
</issue_to_address>

### Comment 2
<location path="TMessagesProj/src/main/java/tw/nekomimi/nekogram/settings/NekoExperimentalSettingsActivity.java" line_range="340-341" />
<code_context>
                 tooltip.showWithAction(0, UndoView.ACTION_NEED_RESATRT, null, null);
             } else if (key.equals(NaConfig.INSTANCE.getDisableStories().getKey())) {
                 tooltip.showWithAction(0, UndoView.ACTION_NEED_RESATRT, null, null);
+            } else if (key.equals(NaConfig.INSTANCE.getShowChannelIcon().getKey())) {
+                updateRows();
             }
         };
</code_context>
<issue_to_address>
**Bound messages keep stale labels**

When the option changes while messages with the previous label are already bound, `updateRows()` refreshes only the settings list; `ChatMessageCell.setMessageObjectInternal()` has already stored each message label, so bound cells keep showing the old alias or icon until rebound.

Refresh or rebind the visible `ChatMessageCell` instances when the option changes.
</issue_to_address>

### Comment 3
<location path="TMessagesProj/src/main/java/tw/nekomimi/nekogram/helpers/TimeStringHelper.java" line_range="14" />
<code_context>

 public class TimeStringHelper {
     public static Drawable forwardsDrawable;
+    public static Drawable channelDrawable;

     public static Drawable getForwardsDrawable() {
</code_context>
<issue_to_address>
**Channel icons use wrong colors**

When channel-label spans with different admin colors are drawn in succession, `TimeStringHelper.getChannelDrawable()` returns the same mutable drawable to every `ColoredImageSpan`. A span can change its color filter while another span skips resetting it because its cached tint is unchanged, so icons display the wrong colors.

Return a separate mutated drawable for each span, or reset the drawable’s color filter on every draw.

Also at `TMessagesProj/src/main/java/org/telegram/ui/Cells/ChatMessageCell.java:19078-19081`, `TMessagesProj/src/main/java/tw/nekomimi/nekogram/helpers/TimeStringHelper.java:25-27`.
</issue_to_address>

### Comment 4
<location path="TMessagesProj/src/main/java/tw/nekomimi/nekogram/settings/NekoExperimentalSettingsActivity.java" line_range="340-341" />
<code_context>
                 tooltip.showWithAction(0, UndoView.ACTION_NEED_RESATRT, null, null);
             } else if (key.equals(NaConfig.INSTANCE.getDisableStories().getKey())) {
                 tooltip.showWithAction(0, UndoView.ACTION_NEED_RESATRT, null, null);
+            } else if (key.equals(NaConfig.INSTANCE.getShowChannelIcon().getKey())) {
+                updateRows();
             }
         };
</code_context>
<issue_to_address>
**Channel label setting stays stale**

When the user changes ShowChannelIcon while the settings screen is open, the toggle handler calls `updateRows()`, but the custom-label row is added or removed only in `setCanNotChange()`. Since the handler does not call that row-management logic, changing the icon setting leaves the custom-label row visible or hidden until the settings screen is rebuilt.

Reapply the custom-label row visibility rule when the setting changes, then refresh the adapter.

Also at `TMessagesProj/src/main/java/tw/nekomimi/nekogram/settings/NekoExperimentalSettingsActivity.java:552-555`.
</issue_to_address>

Sourcery assessment

Approval pending. 4 findings to address first.

Blocking findings: TMessagesProj/src/main/java/org/telegram/ui/Cells/ChatMessageCell.java:19099, TMessagesProj/src/main/java/tw/nekomimi/nekogram/settings/NekoExperimentalSettingsActivity.java:341, TMessagesProj/src/main/java/tw/nekomimi/nekogram/helpers/TimeStringHelper.java:14, TMessagesProj/src/main/java/tw/nekomimi/nekogram/settings/NekoExperimentalSettingsActivity.java:341

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