fix: add missing .borders(Borders.ALL) to restore TUI pane borders

[gnodet]

Summary

Claude Code on behalf of forgebot

Fixes missing pane borders in the TUI dashboard. TamboUI's Block widget requires both .borderType() and .borders(Borders.ALL) to render border characters. All 131 Block.builder() calls across the TUI module were missing .borders(Borders.ALL), causing no rounded border box-drawing characters (╭╮╰╯│─) to render around any pane.

Before (no borders):

 Routes sort:name
   ROUTE   FROM      STATUS   AGE   TOTAL  FAIL
   route1  timer://  Started  10s       0     0

 Processors [route1]
   TYPE    PROCESSOR   TOTAL  FAIL
   log     log1           50     0

After (borders restored):

╭ Routes sort:name ────────────────────────────────────╮
│  ROUTE   FROM      STATUS   AGE   TOTAL  FAIL       │
│  route1  timer://  Started  10s       0     0        │
╰──────────────────────────────────────────────────────╯
╭ Processors [route1] ────────────────────────────────╮
│  TYPE    PROCESSOR   TOTAL  FAIL                     │
│  log     log1           50     0                     │
╰──────────────────────────────────────────────────────╯

Changes

• 36 source files: Added .borders(Borders.ALL) after every .borderType(BorderType.ROUNDED) call and added import dev.tamboui.widgets.block.Borders
• 1 new test file (BorderRenderTest.java): 17 rendering tests that render tabs into a virtual terminal buffer via Frame.forTesting(Buffer) and verify border characters appear at the correct positions

Test Coverage (BorderRenderTest — 17 tests)

• HealthTab: top/bottom corners, vertical/horizontal borders, complete box formation, left/right border alignment
• RoutesTab: full border box, dual pane borders (routes + processors), separate borders for each pane, non-overlapping borders
• ErrorsTab: border box with data, border box in empty state
• No-selection: border in unselected state
• ShellPanel: border rendering when panel is open
• Border type validation: BorderType.ROUNDED characters match expected Unicode codepoints
• Corner alignment: ╭/╮ on same row, ╰/╯ on same row

Test plan

• All 248 tests pass locally (231 existing + 17 new border tests)
• Rendering tests validate actual border characters (╭╮╰╯│─) in the virtual terminal buffer
• Code formatted with mvn formatter:format impsort:sort
• CI build passes

🤖 Generated with Claude Code

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• dsl/camel-jbang/camel-jbang-plugin-tui

All tested modules (2 modules)

• Camel :: JBang :: Plugin :: TUI
• Camel :: Launcher :: Container

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⚙️ View full build and test results

[davsclaus]

Clean mechanical fix — all 130 .borderType(BorderType.ROUNDED) call sites now consistently include .borders(Borders.ALL), and the 17 new BorderRenderTest tests verify border characters render correctly in the virtual terminal buffer.

Note: this PR stacks on #24279 (first 2 commits are shared). Merging #24279 first will reduce this PR's diff to just the borders fix.

CI is green, no issues found.

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