Fix two crashes that make task_showcase unusable on Windows

[dhruv-15-03]

assets/task_showcase returns HTTP 500 on every route when run on Windows. Two independent, unrelated causes.

1. strftime("%-m/%-d/%Y, %-I:%M:%S %p") raises ValueError

The %- no-padding flag is a glibc extension. It is not in the C standard, and the Windows CRT rejects it outright (its equivalent is %#m). /task/<id> therefore dies with ValueError: Invalid format string before rendering anything.

Replaced with direct field formatting, which needs no platform-specific directives. Output is byte-identical to the glibc original - verified across the noon/midnight boundaries where a naive hour % 12 would be off by twelve:

Input	Output
2026-08-02 23:13:16	8/2/2026, 11:13:16 PM
2026-01-01 00:00:00	1/1/2026, 12:00:00 AM
2026-12-25 12:00:00	12/25/2026, 12:00:00 PM
2026-10-09 09:05:07	10/9/2026, 9:05:07 AM

2. Path.read_text() without an encoding

Three call sites read JSON with no encoding argument, so Python uses the platform default - UTF-8 on Linux/macOS, but cp1252 on most Windows installs. Any non-ASCII byte in task.json or report.json (a currency symbol, an em dash, a non-Latin company name) raises UnicodeDecodeError, and a UTF-8 BOM surfaces as the rather misleading Expecting value: line 1 column 1.

Two other read_text() calls in the same module (build_steps, lines 74 and 89) already pass encoding="utf-8". This aligns the remaining three with that existing convention rather than introducing a new one.

Verification

Reproduced on Windows 11 / Python 3.12.9 / Flask 3.1.3:

• Before: / and /task/<id> both returned 500.
• After: both return 200, rendering a report with 11 sections, 117 table rows and 105 cards.

No behaviour change on Linux or macOS - the timestamp string and the decoded JSON are identical there. Single file, +12/-4, no new dependencies and no public API change.

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[dhruv-15-03]

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[dhruv-15-03]

Correction to my previous comment on this PR.

I entered company="Microsoft" in error — I copied the illustrative example
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