fix(tui): show 'more content available' for view_request over 15 lines

[sean-kim05]

Closes #685

What

In strix/interface/tui/renderers/proxy_renderer.py, ViewRequestRenderer.render() slices content to 15 lines and then guards the truncation hint with a condition that can never be true:

lines = content.split("\n")[:15]
...
if has_more or len(lines) > 15:   # len(lines) is at most 15 after the slice
    ...
    text.append("  ... more content available", ...)

Because lines is already capped at 15, len(lines) > 15 is always False. When a result has more than 15 lines but has_more is falsy, the first 15 are shown and the rest are dropped with no "more content available" indicator — the reader thinks they saw everything.

Why

The sibling RepeatRequestRenderer.render() in the same file measures the original line count correctly:

if body_truncated or len(body.split("\n")) > 5:

Change

Measure the original content length: len(lines) > 15 → len(content.split("\n")) > 15. One expression, confined to ViewRequestRenderer.render.

Tests

Added tests/test_proxy_renderer.py:

• 30-line content, has_more=False → hint shown (fails on old code, passes with fix)
• 5-line content → hint not shown
• has_more=True → hint shown

Full suite: 86 passed; ruff check/format clean; mypy clean on the new test.

[greptile-apps]

Greptile Summary

This PR fixes the missing TUI truncation hint for long view_request output.

• Updates ViewRequestRenderer to count the original content lines.
• Keeps the existing has_more behavior for paginated output.
• Adds tests for long content, short content, and explicit has_more cases.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
strix/interface/tui/renderers/proxy_renderer.py	Changes the ViewRequestRenderer hint condition so long content still shows the more-content marker after display slicing.
tests/test_proxy_renderer.py	Adds focused coverage for the corrected truncation hint behavior.

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